Crystal's Coder Hub👁️ CPT 65750 — Keratoplasty (Corneal Transplant); Penetrating (In Aphakia)
Quick Reference
wRVU: 17.61 (verify CMS MPFS RVU26A) | Global Period: 090 (90 days) | Assistant Payable: Yes | Bilateral Indicator: 1 CPT 65750 carries a 90-day global period — among the longest in ophthalmology surgery — meaning all routine postoperative care is bundled into a single surgical payment from the date of service through postoperative day 90, a critical consideration given the frequency of graft monitoring, suture adjustment, and topographic follow-up inherent to penetrating keratoplasty. The bilateral indicator of 1 triggers standard CMS bilateral payment rules (150% of the single-procedure allowable) if both eyes are operated in the same session, which is exceedingly rare for keratoplasty. The aphakia qualifier in this descriptor is the sole determinant separating 65750 from 65730 (penetrating keratoplasty in a phakic eye) and from 65755 (penetrating keratoplasty in a pseudophakic eye with an IOL); selecting the wrong code in this family based on a misread of lens status is the single most common audit finding for keratoplasty claims.
📋 Clinical Description
CPT 65750 describes penetrating keratoplasty (PKP) — a full-thickness corneal transplant — performed specifically in an eye with documented aphakia, meaning no crystalline or prosthetic lens is present at the time of surgery. The surgeon trephines and excises the diseased host cornea in its entirety through all five layers (epithelium, Bowman’s layer, stroma, Descemet’s membrane, and endothelium), then sutures a matched full-thickness donor corneal button into the host bed using interrupted or continuous 10-0 nylon sutures; the absence of a posterior capsule and crystalline lens in the aphakic eye creates direct communication between the anterior chamber and the vitreous cavity, adding significant intraoperative risk not present when performing 65730 in a phakic eye or 65755 in a pseudophakic eye with capsular and IOL support. This code encompasses the full surgical episode through the 90-day global window including routine graft monitoring; however, if concurrent backbench preparation of a corneal endothelial allograft is performed prior to endothelial transplantation, that work is separately captured by add-on code +65757, which applies specifically to endothelial keratoplasty techniques (DSEK, DMEK) and is not reported with 65750.
Aphakia — the complete absence of the crystalline lens from the anterior segment — most commonly results from prior intracapsular cataract extraction (ICCE), a technique widely practiced before the 1980s that removed the entire lens and its capsule as a unit, leaving no structural posterior support for an IOL and no capsular barrier between the anterior and vitreous compartments. In aphakic eyes, this lack of capsular support substantially increases the risk of vitreous prolapse during keratoplasty, frequently necessitates concurrent anterior vitrectomy as part of the operative plan, and contributes to the accelerated endothelial cell loss responsible for the aphakic bullous keratopathy that most commonly drives the need for this transplant. When the corneal failure with endothelial decompensation occurs in a pseudophakic eye — one in which an IOL has been implanted following extracapsular extraction or phacoemulsification — 65755 governs regardless of technical similarity to 65750, and the distinction must be confirmed in the operative note rather than assumed from the preoperative diagnosis list.
This procedure may be performed in the following clinical contexts:
- Aphakic bullous keratopathy — The most common indication for 65750; chronic endothelial failure secondary to prior ICCE or traumatic lens loss produces progressive corneal edema, epithelial bullae, pain, and visual deterioration that ultimately requires full-thickness replacement when medical and contact lens palliation are no longer effective; H18.11 or H18.12 paired with H27.01 or H27.02 is the standard code set.
- Corneal scarring or stromal opacity in an aphakic eye — Dense central corneal opacification from prior herpes simplex keratitis, bacterial or fungal ulcer, chemical injury, or trauma in a patient with concurrent documented aphakia drives selection of 65750 over 65730 when the aphakic status is confirmed in the operative note; H17.11 or H17.12 serves as the primary diagnosis with H27.01 or H27.02 as additional diagnosis.
- Failed prior corneal graft in an aphakic eye — Re-keratoplasty (repeat penetrating keratoplasty) performed for irreversible graft failure or rejection in an eye that remains aphakic following a prior transplant; T86.841 (graft failure) or T86.840 (graft rejection) is assigned as additional diagnosis with 7th character A for the initial active treatment encounter, documenting the clinical complexity and supporting medical necessity for repeat transplantation.
- Corneal degeneration or dystrophy with concurrent aphakia — Progressive corneal dystrophies (including hereditary endothelial dystrophies) occurring in an eye that is concurrently aphakic from prior surgery or trauma; the aphakic status must be independently documented in the record and confirmed in the operative note to justify 65750 rather than a sibling code.
- Tectonic keratoplasty for impending or actual perforation in an aphakic eye — Emergency or urgent penetrating keratoplasty to restore globe integrity when progressive corneal ulceration has advanced to imminent or complete perforation in an aphakic patient; the aphakic status and the urgent surgical indication must each be separately documented in the pre-operative assessment and operative report.
🔬 Anatomical & Procedural Considerations
| Variant | Mechanism | Key Notes |
|---|---|---|
| Standard PKP in Aphakic Eye | The surgeon applies a circular trephine (typically 7.0–8.5 mm) to excise the full-thickness diseased host cornea under the operating microscope; a donor button cut from a corneoscleral rim (typically 0.25–0.5 mm larger than the host trephine) is sutured into the host bed using 10-0 nylon in an interrupted (16-bite), continuous, or combined pattern; the aphakic state requires meticulous anterior chamber maintenance with viscoelastic to prevent vitreous entry during open-sky trephination. | The aphakic eye presents the surgeon with no posterior capsule to block vitreous migration into the anterior chamber during the open-sky phase; viscoelastic placement, careful patient positioning, and controlled intraoperative IOP management are essential; the operative note must explicitly state that the eye was aphakic to support 65750 selection on audit — documentation of aphakic status in the diagnosis list alone is insufficient without corroboration in the body of the operative report. |
| Concurrent Anterior Vitrectomy | When vitreous presents into the anterior chamber during trephination or donor button placement — an expected risk in aphakic eyes — the surgeon performs anterior vitrectomy using a vitrectomy handpiece or automated cutter to remove prolapsed vitreous before final suturing of the donor button; this intraoperative step is documented in the narrative of the operative report with characterization of the vitreous volume encountered and the technique used to manage it. | Anterior vitrectomy performed as an intraoperative response to vitreous prolapse during 65750 may be separately reportable depending on individual payer policy and NCCI edit status for the specific code combination; coders should review the NCCI Procedure-to-Procedure (PTP) edit table for the relevant code pair and apply modifier -59 (or -XS) only when the vitrectomy is documented as a distinct, substantial service with its own operative note narrative and not simply a line notation in the keratoplasty report — NCCI edits for intraocular procedures are updated annually and must be verified against the current edit table for the claim date of service. |
| Triple Procedure: PKP + Vitrectomy + Secondary IOL Implantation | In selected aphakic patients, the surgeon simultaneously performs penetrating keratoplasty, anterior vitrectomy, and placement of a secondary anterior chamber or iris-sutured/scleral-fixated posterior chamber IOL to address both the corneal failure and the aphakic state in a single operative session under one anesthetic episode; this planned combined approach is documented preoperatively as a triple procedure with each component individually described in the operative note. | When secondary IOL implantation (66985) is performed concurrently with 65750, the IOL placement is separately reportable as a distinct, complete surgical service; modifier -51 is applied to the lower-valued code (typically 66985) to indicate multiple procedures in the same session, and the operative note must independently describe both the keratoplasty and the IOL implantation as complete discrete services rather than incidental steps within a single procedure — failure to document each component separately is the primary audit vulnerability for triple-procedure keratoplasty claims. |
Clinical Pearl
The single most important documentation element that separates 65750 from 65730 and 65755 is an explicit, independent statement in the body of the operative note confirming that the operative eye was aphakic at the time of surgery — a preoperative diagnosis of H27.01 or H27.02 listed on the face sheet does not satisfy this requirement on audit. If the operative note says “the left eye is pseudophakic” or “IOL noted in the anterior chamber” anywhere in the body of the report — even if the preoperative sheet lists aphakia — the correct code is 65755, not 65750, and the claim must be corrected before submission. Coders should always read the full operative note and confirm lens status language before selecting among the penetrating keratoplasty codes.
✅ Procedure Includes
- Preoperative slit-lamp evaluation, corneal pachymetry, and specular microscopy performed on the day of surgery are bundled into the global surgical payment and are not separately reportable.
- Retrobulbar, peribulbar, or general anesthesia as required by the clinical plan; the surgeon’s payment encompasses the anesthetic block when administered by the operating surgeon, while MAC or general anesthesia administered by a separate anesthesiologist is separately billable by that provider under the applicable anesthesia CPT codes.
- Complete full-thickness trephination of the diseased host cornea, including removal of all five corneal layers within the trephine diameter, and excision of the host corneal disc.
- Inspection, measurement, and sizing of the donor corneal button at the back table, including quality assessment — when this involves standard preparation only; for endothelial allograft-specific backbench preparation, +65757 applies separately but is specific to endothelial keratoplasty techniques and is not reported with penetrating keratoplasty codes.
- Placement and suturing of the full-thickness donor button using 10-0 nylon (interrupted, continuous, or combined technique), including intraoperative suture tension adjustment, anterior chamber reformation, and wound integrity testing (e.g., Seidel test).
- Intraoperative viscoelastic injection, balanced salt solution anterior chamber reformation, and subconjunctival or topical antibiotic and corticosteroid administration at conclusion of procedure.
- All postoperative visits, slit-lamp examinations, topographic assessments, and suture tension adjustments within the 90-day global window; suture removal performed within the global period is also bundled.
- Documentation requirements bundled into the global payment: operative note confirming aphakic status, trephine diameter (host and donor), suture technique, intraoperative findings including vitreous status, and disposition of any concurrent services performed.
❌ Excludes / Do Not Report Together
| Code | Description | Relationship to 65750 |
|---|---|---|
| 65730 | Keratoplasty (corneal transplant); penetrating (except in aphakia or pseudophakia) | Mutually exclusive with 65750 based solely on lens status — 65730 applies when the operative eye is phakic (natural crystalline lens present and intact); 65750 applies when no lens of any kind is present; these two codes are never reported together for the same eye, and the correct selection must be confirmed in the body of the operative note rather than assumed from the diagnosis list. |
| 65755 | Keratoplasty (corneal transplant); penetrating (in pseudophakia) | Mutually exclusive with 65750 — 65755 is correct when any IOL is present in the operative eye, including subluxated, malpositioned, or anterior chamber lenses; a common and auditable error is reporting 65750 (aphakia) when the operative note describes an IOL in any position, even if the preoperative problem list included aphakia from an earlier encounter. |
| 65756 | Keratoplasty (corneal transplant); endothelial | Mutually exclusive by surgical technique — 65756 covers endothelial keratoplasty procedures (DSEK, DMEK, PDEK) that preserve the host stroma and replace only the diseased endothelial layer; 65750 replaces the full corneal thickness; the two are never reported for the same eye in the same surgical session. |
| 65710 | Keratoplasty (corneal transplant); lamellar | Mutually exclusive by depth of tissue replacement — 65710 involves partial-thickness corneal transplantation preserving the host endothelium, while 65750 replaces the entire corneal thickness; they cannot be simultaneously performed on the same cornea and are never reported together for the same eye. |
| E/M codes (992xx / 920xx) | Office visit, any level | Separately reportable only when modifier -25 is appended to the E/M code, documenting a significant, separately identifiable evaluation beyond the routine pre-procedure assessment; within the 90-day global period, E/M visits for the keratoplasty eye are bundled unless modifier -24 is supported by documentation of an unrelated, distinctly identified condition. |
Bundling Alert — Global Period is 090, Not 000 or 010
CPT 65750 carries a 90-day global period — one of the longest in ophthalmic surgery — meaning all routine postoperative services related to the keratoplasty are bundled into a single surgical payment from the date of surgery through postoperative day 90, including all slit-lamp exams, corneal topography interpretation, suture adjustment, and graft monitoring visits. This global period is identical to that of 65730, 65755, and 65756, but differs markedly from the 000-day global periods of minor ophthalmic procedures; the most common audit finding for keratoplasty practices is billing separate E/M services for the graft-monitoring eye during the global window without a valid -24 modifier and independent documentation that the encounter addressed a condition unrelated to the transplant. For visits within the 90-day window that address an unrelated ocular or systemic condition in the same encounter, append modifier -24 to the E/M code (not to 65750) and document the unrelated clinical basis explicitly in the encounter note with a distinct ICD-10-CM code for the unrelated condition.
🌳 Code Tree — Surgery: Cornea (Eye and Ocular Adnexa)
CPT 65400–65782 Surgery: Eye and Ocular Adnexa — Cornea
│
├── 65400–65426 Excision (Cornea)
│ ├── 65400 Excision of lesion, cornea (pterygium), without graft
│ └── 65426 Excision of lesion, cornea (pterygium); with graft
│
├── 65710–65757 Keratoplasty (Corneal Transplant)
│ ├── 65710 Keratoplasty (corneal transplant); lamellar (Global: 090)
│ ├── 65730 Keratoplasty (corneal transplant); penetrating (except in aphakia or pseudophakia) (Global: 090)
│ ├── ▶▶ 65750 ◀◀ Keratoplasty (corneal transplant); penetrating (in aphakia) ← YOU ARE HERE (Global: 090)
│ ├── 65755 Keratoplasty (corneal transplant); penetrating (in pseudophakia) (Global: 090)
│ ├── 65756 Keratoplasty (corneal transplant); endothelial (Global: 090)
│ └── +65757 Backbench preparation of corneal endothelial allograft prior to transplantation (Add-on — list separately in addition to primary procedure; endothelial keratoplasty only)
│
└── 65760–65782 Other Corneal Procedures
├── 65760 Keratomileusis (Global: 090)
└── 65771 Radial keratotomy (Global: 090)
💰 RVU & Reimbursement Profile
| Component | Value |
|---|---|
| Work RVU (wRVU) | 17.61 (verify against CMS MPFS RVU26A — flag for annual update) |
| Global Period | 090 (90 days) |
| Bilateral Indicator | 1 — Subject to standard CMS bilateral payment rules; when reported bilaterally (same session, both eyes), payment is 150% of the single-procedure allowable: 100% for the primary eye, 50% for the second eye |
| Assistant Surgeon | ✅ Payable — Recognized given operative complexity, open-sky exposure, and aphakia-associated vitreous risk |
| Co-Surgeon | ✅ Applicable — May apply in complex cases involving concurrent vitreoretinal service |
| Team Surgery | ❌ Not applicable |
| PC/TC Split | ❌ No — Procedure code only (Indicator 0); no professional/technical component split |
| Modifier -51 Exempt | No — Subject to multiple procedure reduction rules when reported with concurrent surgical services in the same session |
| Anesthesia | General anesthesia or MAC with retrobulbar/peribulbar block; anesthesia is separately billable by the anesthesiologist and is not bundled into the surgeon’s payment |
Bilateral Billing Rules
CPT 65750 has a bilateral indicator of 1, meaning standard CMS bilateral payment reduction rules apply when keratoplasty is performed on both eyes in a single operative session — a scenario that is clinically very uncommon for penetrating keratoplasty but must be handled correctly when it occurs. Bilateral keratoplasty is billed using modifier -50 on a single claim line, or on two separate lines with -RT and -LT, depending on MAC preference — verify the preferred format with the applicable MAC before submission, as some MACs trigger edits with one format and not the other. Under Medicare bilateral payment rules, the allowable for a -50 claim is 150% of the single-procedure rate: 100% for the first eye and 50% for the second. Simultaneous bilateral penetrating keratoplasty requires robust documentation of independent medical necessity for both eyes in the same session and should be expected to attract payer review.
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -RT | Right Side | Applied when 65750 is performed on the right eye; required for all unilateral right-eye keratoplasty claims to establish laterality for global period tracking, bilateral edit avoidance, and correct claims pairing when the patient has prior or subsequent left-eye procedures. |
| -LT | Left Side | Applied when 65750 is performed on the left eye; paired with -RT in bilateral cases billed on two separate lines; required at the same standard as -RT for laterality documentation. |
| -50 | Bilateral Procedure | Applied when penetrating keratoplasty is performed on both eyes in the same operative session; triggers the 150% bilateral payment calculation; confirm MAC preference for single-line -50 versus two-line -RT/-LT billing before submission, as format preferences vary by jurisdiction. |
| -E1 | Upper Left Eyelid | Not applicable — E1–E4 modifiers designate specific eyelid positions and are used exclusively for eyelid procedures; applying them to 65750 or any corneal transplant code is incorrect and will generate claim edits or denials. |
| -E2 | Lower Left Eyelid | Not applicable — same rationale as -E1; corneal procedures use -RT, -LT, and -50 for laterality, not eyelid-position modifiers; do not append E-series modifiers to any keratoplasty code. |
| -E3 | Upper Right Eyelid | Not applicable — same rationale as -E1 and -E2; appending E-series modifiers to 65750 constitutes a modifier misuse error and is an audit flag in ophthalmology compliance reviews. |
| -E4 | Lower Right Eyelid | Not applicable — same rationale as above; E-series modifiers have no valid application to any code in the keratoplasty family. |
| -25 | Significant, Separately Identifiable E/M | Applied to the E/M code — not to 65750 — when a separately identifiable, medically necessary evaluation beyond the routine pre-procedure assessment is performed and documented on the same date of service; the E/M note must stand independently with its own history, examination, and medical decision-making addressing a separate clinical question distinct from the decision to proceed with keratoplasty. |
| -24 | Unrelated E/M During Postoperative Period | Applied to the E/M code when a patient returns within the 90-day global period for a condition unrelated to the keratoplasty; the encounter note must explicitly state the unrelated nature of the visit, name the unrelated condition with a distinct ICD-10-CM code, and document that no graft-related care was provided at that visit. |
| -51 | Multiple Procedures | Applied to the lower-valued code when 65750 is reported alongside other surgical procedures in the same session (e.g., secondary IOL implantation 66985, vitrectomy); apply to the secondary code unless 65750 is the lesser-valued procedure in the combination. |
| -59 | Distinct Procedural Service | Applied when 65750 is inappropriately bundled by a payer with a separately reportable concurrent service (e.g., anterior vitrectomy for frank vitreous prolapse documented as a distinct surgical service); documents a separate anatomic step, independent medical necessity, or distinct service; X-modifiers (-XS, -XU) are accepted by many payers as more specific alternatives when the clinical rationale aligns. |
| -52 | Reduced Services | Applied when the keratoplasty is substantially reduced in scope (e.g., trephination completed but donor button placement aborted due to intraoperative donor quality issue); document the clinical reason for reduction thoroughly in the operative report. |
| -53 | Discontinued Procedure | Applied when the procedure is stopped after initiation due to a patient safety event (e.g., sudden anesthetic complication, acute IOP crisis); distinct from -52 in that no meaningful partial service was completed; requires detailed operative documentation of the reason for discontinuation. |
| -58 | Staged or Related Procedure | Applied when a planned second-stage corneal procedure (e.g., regrafting, suture removal under anesthesia as a planned event) is performed during the 90-day global period as part of a documented staged operative plan; the staged plan must be documented preoperatively. |
| -78 | Unplanned Return to OR | Applied when an unplanned return to the operating room occurs during the global period for a complication directly related to 65750 (e.g., wound dehiscence, graft dislocation, suture erosion requiring operative repair); payment is reduced under -78 — intraoperative and postoperative components only — and a new global period does not begin with the -78 encounter. |
| -79 | Unrelated Procedure During Postoperative Period | Applied when a surgical procedure entirely unrelated to the keratoplasty is performed during the 90-day global window; the unrelated nature must be explicitly documented in the operative record with a distinct ICD-10-CM code supporting the independent indication. |
🩺 Common ICD-10-CM Pairings
Primary Diagnosis Group — Corneal Indications for Penetrating Keratoplasty
| ICD-10 | Description | HCC? | Notes |
|---|---|---|---|
| H18.11 | Bullous keratopathy, right eye | ❌ No | The most common indication for 65750; results from irreversible endothelial decompensation in an aphakic eye causing stromal edema, epithelial bullae, photophobia, and pain; assign as PDx when bullous keratopathy is the primary surgical indication and the operative eye is the right eye. Pair with H27.01 as required additional diagnosis — the absence of an aphakia code on a 65750 claim is a standalone audit vulnerability. |
| H18.12 | Bullous keratopathy, left eye | ❌ No | Left-eye counterpart to H18.11; same coding rationale and documentation requirements apply; pair with H27.02 as required additional diagnosis; do not default to H18.10 (unspecified) without querying the provider when laterality is genuinely absent from documentation. |
| H18.13 | Bullous keratopathy, bilateral | ❌ No | Assign when bullous keratopathy is documented bilaterally and bilateral keratoplasty is being performed; if keratoplasty is unilateral despite bilateral corneal disease, assign the laterality-specific code for the operative eye only — do not assign bilateral codes for unilateral procedures. Pair with H27.03 when bilateral aphakia is confirmed. |
| H17.11 | Central corneal opacity, right eye | ❌ No | Assign when dense stromal scarring from prior HSV keratitis, bacterial or fungal ulcer, chemical injury, or blunt trauma is the transplant indication in the right aphakic eye; code scar etiology when documented (e.g., sequelae codes for post-infectious scarring); query provider to distinguish scar (H17.xx) from active keratitis when the clinical timeline is ambiguous. |
| H17.12 | Central corneal opacity, left eye | ❌ No | Left-eye counterpart to H17.11; same rationale applies; pair with H27.02 to document aphakia as the code-selection determinant; provider documentation of scar etiology should be captured as additional diagnosis when available to support medical necessity narrative. |
Secondary Group — Aphakia (Required Additional Diagnosis to Justify CPT 65750)
| ICD-10 | Description | HCC? | Notes |
|---|---|---|---|
| H27.01 | Aphakia, right eye | ❌ No | Always assign as additional diagnosis on all 65750 claims for the right eye — this is the ICD-10-CM documentation anchor that confirms aphakic status and distinguishes the operative indication for 65750 from 65730 (phakic) and 65755 (pseudophakic); its absence on the claim creates an indefensible code-selection gap on post-payment audit. |
| H27.02 | Aphakia, left eye | ❌ No | Required additional diagnosis for all left-eye 65750 claims; same auditable requirement as H27.01; bilaterally aphakic patients undergoing bilateral PKP should have both H27.01 and H27.02 — or H27.03 if bilateral aphakia is documented as a single finding — on the claim. |
| H27.03 | Aphakia, bilateral | ❌ No | Assign when bilateral aphakia is explicitly documented by the provider; in bilateral keratoplasty cases, confirm whether the bilateral code or side-specific aphakia codes are most accurate based on provider documentation — when the bilateral code is used, ensure it aligns with the laterality of the keratoplasty procedure(s) being billed. |
Etiology / Complication Codes
| ICD-10 | Description | HCC? | Notes |
|---|---|---|---|
| T86.841 | Corneal transplant failure | ❌ No | Assign as additional diagnosis when 65750 represents a repeat keratoplasty for irreversible failure of a prior corneal graft; requires 7th character A for the initial active treatment encounter at the time of re-keratoplasty; supports medical necessity for repeat transplantation and documents the clinical complexity of the case for payer review. Do not assign without documented history of a prior corneal transplant in the record. |
| T86.840 | Corneal transplant rejection | ❌ No | Assign as additional diagnosis when re-keratoplasty is performed due to immune-mediated graft rejection that has progressed irreversibly despite treatment; clinically distinct from T86.841 (failure without immune mechanism) — the distinction should be confirmed with the provider when not explicit; same 7th character requirements apply as T86.841; 7th character A for the operative encounter. |
Coding Specificity Reminder
The most critical specificity axis for all ICD-10-CM pairings with 65750 is laterality: H18.1x, H17.1x, and H27.0x each require a final character specifying right eye, left eye, bilateral, or unspecified, and the unspecified options (H18.10, H17.10, H27.00) should only be assigned when laterality is genuinely absent from all available documentation — which is itself a documentation deficiency that should trigger a provider query before code assignment. The secondary required specificity is ensuring H27.01, H27.02, or H27.03 is present on every 65750 claim as a mandatory additional diagnosis; this is not optional context — it is the ICD-10-CM evidence that confirms the CPT code selection and is the first code reviewed on audit. For T86.84x codes in re-keratoplasty cases, verify the correct 7th character (A for initial encounter at time of surgery) and confirm prior transplant history is documented in the record before assigning.
🏥 MS-DRG Considerations
CPT 65750 is performed in the outpatient hospital or ASC setting in the overwhelming majority of clinical presentations; inpatient admission for penetrating keratoplasty as the primary operative indication is not routinely supported by payers, MACs, or utilization review standards, and would require documentation of exceptional clinical circumstances such as a serious concurrent systemic condition or a complication requiring inpatient-level monitoring. In the rare event that an inpatient admission is supported and keratoplasty is performed, the procedure maps to MDC 02 (Diseases and Disorders of the Eye) and the intraocular procedure DRG tier: DRG 117 (Intraocular Procedures with MCC), DRG 118 (Intraocular Procedures with CC), or DRG 119 (Intraocular Procedures without CC/MCC); GMLOS values for this DRG tier should be verified against the current CMS IPPS Final Rule for the applicable fiscal year. CC and MCC status of documented comorbidities — such as systemic immunosuppression, graft-versus-host disease, or metabolic conditions affecting wound healing — may upgrade grouping from DRG 119 to DRG 117 or 118 and should be captured as additional diagnoses when they meet UHDDS criteria for additional diagnosis assignment. For inpatient encounters, ICD-10-PCS codes replace CPT for facility coding purposes; see the ICD-10-PCS section below for the applicable code set.
🔧 ICD-10-PCS Equivalents (Inpatient Facility Coding)
Note
Penetrating keratoplasty maps to the Root Operation Replacement (R) in the ICD-10-PCS Eye body system (character 8), reflecting the full excision and replacement of the diseased cornea with donor tissue as a single unified operative action — in PCS, Replacement inherently includes the removal of the body part being replaced, so no separate Excision or Resection code is assigned for the host corneal excision. Laterality is captured at the Body Part character (position 4), and PCS has no modifier equivalent — a separate code line is required for each eye when bilateral keratoplasty is performed. Inpatient facility coding for keratoplasty is uncommon but will influence DRG grouping when inpatient admission is supported.
| PCS Code | Full Description | Applicable Modality |
|---|---|---|
08R8XK3 | Replacement of Right Cornea with Nonautologous Tissue Substitute, Full Thickness, External Approach | Standard penetrating keratoplasty, right eye — cadaveric eye bank allograft (the standard donor source for all routine PKP) |
08R9XK3 | Replacement of Left Cornea with Nonautologous Tissue Substitute, Full Thickness, External Approach | Standard penetrating keratoplasty, left eye — cadaveric eye bank allograft |
08R8X73 | Replacement of Right Cornea with Autologous Tissue Substitute, Full Thickness, External Approach | Penetrating keratoplasty using autologous corneal tissue (very rare; limited to specific reconstructive or re-transplantation scenarios), right eye |
08R9X73 | Replacement of Left Cornea with Autologous Tissue Substitute, Full Thickness, External Approach | Penetrating keratoplasty using autologous tissue substitute, left eye; same rare indication as autologous right-eye code above |
PCS Character Analysis — 08R8XK3
| Position | Character | Value | Definition |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical — the broadest ICD-10-PCS classification, encompassing all operative procedures that involve cutting, excising, replacing, or manipulating body structures through direct manual or instrument-based intervention. |
| 2 | Body System | 8 | Eye — encompasses all structures of the globe, adnexa, and cornea including both anterior and posterior segment structures; all inpatient operative procedures on the cornea, iris, lens, vitreous, and retina are classified under body system 8. |
| 3 | Root Operation | R | Replacement — defined in ICD-10-PCS as “Putting in or on biological or synthetic material that physically takes the place and/or function of all or a portion of a Body Part”; full-thickness penetrating keratoplasty is the prototypical application of Replacement in the Eye body system, as the diseased host cornea is fully excised and replaced with donor tissue in a single continuous operative step. |
| 4 | Body Part | 8 | Cornea, Right — identifies the right cornea as the operative target; for left-eye keratoplasty this character changes to 9 (Cornea, Left), generating a separate and distinct PCS code; bilateral PKP requires two separate PCS code lines, one for each eye. |
| 5 | Approach | X | External — defined as procedures performed directly on the skin or mucous membrane, or through a natural or artificial external opening; penetrating keratoplasty is performed through the external corneal surface under direct microscopic visualization without any endoscopic assistance, making External the required approach value for all forms of keratoplasty. |
| 6 | Device | K | Nonautologous Tissue Substitute — assigned when the donor corneal material is a cadaveric allograft procured from an eye bank, which is the source for all standard PKP procedures; when autologous corneal tissue is used (exceedingly rare), this character is 7 (Autologous Tissue Substitute); synthetic corneal implants (keratoprosthesis) would be coded as J (Synthetic Substitute). |
| 7 | Qualifier | 3 | Full Thickness — specifies that the entire corneal depth is replaced, distinguishing penetrating keratoplasty from lamellar procedures at the PCS qualifier axis; this character directly parallels the CPT family distinction between 65750/65730/65755 (full thickness, qualifier 3) and 65710 (lamellar, qualifier 4). |
Root Operation Comparison
- Use Replacement (R) with Qualifier 3 (Full Thickness) for all forms of penetrating keratoplasty (CPT 65730, 65750, 65755) — the entire corneal thickness is excised and replaced with donor tissue, and the Replacement root operation captures both the removal and implantation as a single action without requiring a separate Resection code for the host corneal disc.
- Use Replacement (R) with Qualifier 4 (Partial Thickness) for lamellar keratoplasty (CPT 65710) — only a portion of the corneal depth is replaced while the host endothelium is preserved; the root operation remains Replacement but the qualifier shifts from Full Thickness (3) to Partial Thickness (4).
- For endothelial keratoplasty (DSEK/DMEK — CPT 65756), Replacement remains the root operation but the qualifier reflects partial thickness (4) and the device character reflects the graft type; consult the current FY ICD-10-PCS Tables directly for the endothelial keratoplasty code set as guideline revisions have updated this mapping in recent fiscal years.
📝 Coding Examples
Example 1 — ASC: Aphakic Bullous Keratopathy, Right Eye, Routine Penetrating Keratoplasty
Clinical Scenario: A 76-year-old male with a history of intracapsular cataract extraction (ICCE) of the right eye performed in 1977 presents with progressive right eye pain, tearing, photophobia, and visual acuity of count fingers at 3 feet OS. Slit-lamp examination reveals diffuse corneal stromal edema with epithelial microcystic changes and macrobullae at 2, 5, and 9 o’clock consistent with advanced aphakic bullous keratopathy. The left eye is pseudophakic with a well-positioned posterior chamber IOL. The operative report documents: “The right eye is aphakic with no capsular remnant or lens support; vitreous was present at the pupillary aperture and anterior vitrectomy was performed prior to donor button placement.” A 7.75 mm donor button is secured with 16 interrupted 10-0 nylon sutures; no separate E/M service is documented as the preoperative evaluation was bundled into the surgical workup.
| Field | Code | Rationale |
|---|---|---|
| CPT | 65750--RT | Penetrating keratoplasty in aphakia, right eye; the operative note explicitly documents “aphakic with no capsular remnant” confirming 65750 over 65730 (phakic) or 65755 (pseudophakic); -RT establishes right-eye laterality for global period initiation and tracking. |
| PDx | H18.11 | Bullous keratopathy, right eye — the primary corneal indication driving the operative intervention, coded to the highest specificity with right-eye laterality confirmed; this is the clinical reason the keratoplasty was performed. |
| SDx | H27.01 | Aphakia, right eye — required additional diagnosis confirming aphakic status at the time of surgery; this code is the ICD-10-CM anchor justifying 65750 over the sibling codes and must appear on the claim. |
Note
The anterior vitrectomy documented in this operative note may be separately reportable depending on payer policy and current NCCI PTP edit status — if billed separately, the vitrectomy must be described in the operative note as a distinct, substantial service with its own narrative, not merely a single-line notation within the keratoplasty description; append modifier -59 or -XS and verify the edit table for the specific code pair and date of service. No separate E/M is appropriate here as no independently documented pre-procedure evaluation addressing a distinct clinical question appears in the record.
Example 2 — Outpatient Hospital: Failed Prior Corneal Graft in Aphakic Eye, Left Side, with Separately Identifiable E/M
Clinical Scenario: A 69-year-old female with a history of penetrating keratoplasty of the left eye performed 12 years ago for aphakic bullous keratopathy presents with progressive left graft failure over the past 9 months; BCVA is 20/800, and slit-lamp exam demonstrates diffuse graft edema with endothelial guttae and stromal haze consistent with endothelial failure of the prior graft. The record documents the left eye remains aphakic — no IOL was placed at either the original ICCE or the prior keratoplasty. The operative note states: “The left eye is aphakic with no capsular support; repeat penetrating keratoplasty was performed using an 8.0 mm donor button with 16 interrupted 10-0 nylon sutures.” On the same date, the surgeon performs a separately documented, independently signed evaluation of newly diagnosed systemic hypertension requiring medication adjustment — a condition unrelated to the keratoplasty — with a distinct note including a separate history, physical examination, and medication management plan meeting the requirements for an office or other outpatient visit.
| Field | Code | Rationale |
|---|---|---|
| CPT 1 | E/M code--25 | The separately identifiable E/M for new hypertension management is billed with -25 appended to the E/M code — not to 65750 — because the evaluation was independently documented with a complete separate note, a distinct clinical problem, and medical decision-making unrelated to the surgical decision. |
| CPT 2 | 65750--LT | Repeat penetrating keratoplasty in aphakia, left eye; operative note confirms “left eye is aphakic with no capsular support”; -LT establishes left-eye laterality. |
| PDx | H18.12 | Bullous keratopathy, left eye — the endothelial failure of the prior graft presents as bullous keratopathy of the left eye and is the primary surgical indication; coded to highest specificity with left laterality confirmed. |
| SDx | H27.02 | Aphakia, left eye — required additional diagnosis confirming aphakic status of the operative eye and anchoring 65750 code selection. |
| SDx | T86.841 | Corneal transplant failure — additional diagnosis confirming this is a re-keratoplasty for documented prior graft failure; 7th character A for initial active treatment encounter at time of re-keratoplasty surgery; supports medical necessity documentation for payer review of repeat transplantation. |
Warning
The -25 modifier must be appended to the E/M code, not to 65750 — appending -25 to the procedure code rather than the E/M code is the single most frequently identified modifier misuse error in ophthalmology compliance audits. The separately identifiable E/M note must stand completely independently with its own history, examination findings, and medical decision-making for the unrelated condition; a brief mention of hypertension within the surgical pre-op note does not meet -25 documentation requirements and will not survive a post-payment audit.
Example 3 — ASC: Unplanned Return to OR During Global Period — Wound Dehiscence
Clinical Scenario: A 73-year-old male undergoes uncomplicated penetrating keratoplasty of the right eye for aphakic bullous keratopathy (65750--RT) on the operative date. On postoperative day 21, the patient presents urgently to the ASC reporting sudden right-eye pain and decreased vision overnight; slit-lamp examination reveals a wound gap at the 6 o’clock suture position with a strongly positive Seidel test confirming aqueous egress through the wound dehiscence. The surgeon returns the patient to the operating room on the same day for wound re-suturing under topical anesthesia; the operative note documents: “Unplanned return to OR for wound dehiscence at the donor-host junction, directly related to the keratoplasty performed on [operative date]; the wound gap was resutured with two interrupted 10-0 nylon sutures and wound integrity was confirmed with negative Seidel test.” No new therapeutic procedure beyond wound repair was performed.
| Field | Code | Rationale |
|---|---|---|
| CPT | 65750--78--RT | Return to OR for wound dehiscence directly and exclusively related to the prior keratoplasty; modifier -78 signals an unplanned return to the OR for a complication arising during the global period; -RT confirms the operative eye; payment under -78 is reduced (intraoperative and postoperative RVU components only, no pre-operative RVU), and a new global period does not begin from the -78 encounter date. |
| PDx | T86.848 | Other complications of corneal transplant — wound dehiscence at the graft-host junction is a complication of the prior keratoplasty not captured by the more specific rejection (T86.840) or failure (T86.841) codes; 7th character D is assigned as this is a subsequent encounter for a complication during the healing phase of the original transplant. |
| SDx | H27.01 | Aphakia, right eye — retained as additional diagnosis to maintain continuity with the original 65750 claim documentation and to confirm the aphakic operative eye for any payer review linking this encounter to the original surgical claim. |
Global period reminder
This encounter falls within the 90-day global period of the original 65750 from the operative date; modifier -78 is mandatory on the return-to-OR claim — without it, the claim will be denied as a duplicate service bundled into the global period of the original procedure. Under -78, Medicare pays for the intraoperative and postoperative components of the procedure’s RVU value only (the pre-operative component is excluded), resulting in reduced reimbursement compared to the same procedure billed outside the global period. Critically, the 90-day global clock does not restart from the -78 encounter date — the original operative date continues to govern the global window and all subsequent visit bundling through postoperative day 90.
⚠️ Common Coding Pitfalls
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Selecting 65750 without explicit operative note confirmation of aphakic status: The most consequential and auditable keratoplasty coding error is assigning 65750 based on a preoperative diagnosis of aphakia without independently confirming that the operative note body states the eye was aphakic at the time of surgery — if the operative note documents “pseudophakia,” “IOL noted,” or any reference to a prosthetic lens, the correct code is 65755 regardless of what appears on the preoperative problem list or face sheet. Coders must read the full operative note before selecting among the penetrating keratoplasty codes, and when the lens status documentation is absent or ambiguous, a query to the provider is required before claim submission.
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Confusing 65750 (aphakia) with 65755 (pseudophakia) for malpositioned or subluxated IOLs: A common and auditable error involves reporting 65750 when an IOL is present in the operative eye but is subluxated, dislocated, or malpositioned — the presence of any IOL in the eye, regardless of its position or function, makes 65755 the correct code, not 65750; the aphakia code family applies only when no prosthetic lens of any kind is present, and the operative note must confirm this affirmatively.
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Omitting H27.0x as an additional diagnosis on the claim: Because the keratoplasty CPT code family is differentiated entirely by lens status, the absence of an aphakia ICD-10-CM code on a 65750 claim creates an indefensible gap between the procedure code billed and the diagnoses reported — payers conducting post-payment audits target 65750 claims without a corresponding H27.0x code as presumptive evidence of code selection error; assignment of H27.01, H27.02, or H27.03 as an additional diagnosis is a required documentation anchor, not optional context.
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Billing separate E/M visits during the 90-day global period without modifier -24 for an unrelated visit: The 90-day global period bundling rule encompasses all postoperative care related to the keratoplasty and the operative eye’s graft management — providers who bill routine graft-monitoring slit-lamp visits as separate E/M services during the global window, without a valid -24 modifier and an independently documented unrelated condition, are at significant recoupment risk; the -24 modifier requires a distinct ICD-10-CM code for the unrelated finding, a separate signed encounter note, and explicit documentation that no graft-related care was provided at that visit.
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Reporting 65750 and 65755 or 65730 on the same claim line for the same eye: These codes are mutually exclusive by definition — lens status determines which one applies, and only one can be correct for any given operative encounter; reporting two penetrating keratoplasty codes for the same eye in the same session will generate an NCCI PTP edit denial and may trigger fraud review if the pattern appears across multiple claims, as it suggests either systematic coder confusion or an attempt to double-bill the surgical service.
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Applying E1–E4 modifier codes to keratoplasty claims: E-series modifiers (-E1 through -E4) are eyelid-position modifiers applicable exclusively to eyelid procedures; appending them to 65750 or any other keratoplasty code is a modifier misuse error that will generate claim edits or denials and may flag the claim for compliance review; laterality for all corneal transplant procedures is communicated only through -RT, -LT, and -50, and billing staff and coders must be specifically trained to distinguish corneal from eyelid modifier conventions in ophthalmology practices that bill both code families.
📎 Sources
1 2 3 4 5 6 1. AMA CPT 2026 Professional Edition — Surgery: Eye and Ocular Adnexa, Codes 65710–65757, Keratoplasty subsection 2. CMS 2026 Medicare Physician Fee Schedule Final Rule — RVU26A Relative Value Files; CPT 65750; verify wRVU against current file 3. NCCI Policy Manual for Medicare Services, Chapter 9 (Eye and Ocular Adnexa), CMS 2025–2026 edition 4. ICD-10-CM Official Guidelines for Coding and Reporting FY2026 — Chapter 7 (Diseases of the Eye and Adnexa, H00–H59); Chapter 19 (Injury, Poisoning — T86.84x) 5. ICD-10-PCS Official Guidelines for Coding and Reporting FY2026 — Root Operation Replacement (R), Eye Body System (8), Section 0 6. American Academy of Ophthalmology (AAO) Coding Coach — Corneal Surgery: Penetrating Keratoplasty and Keratoplasty Code Family Distinctions, 2025 edition