Crystal's Coder Hub🦻 CPT 69636 — Tympanoplasty With Antrotomy Or Mastoidotomy; With Ossicular Chain Reconstruction
Quick Reference
wRVU: 17.69 | Global Period: 090 (90 days) | Assistant Payable: ✅ Yes | Bilateral Indicator: 0
📋 Clinical Description
CPT 69636 describes a combined middle ear and mastoid surgical procedure in which the surgeon (1) reconstructs the tympanic membrane (eardrum) to repair a perforation, (2) reconstructs the ossicular chain (malleus, incus, and/or stapes) using autologous bone to restore or improve conductive hearing, and (3) performs mastoidotomy or antrostomy to access and remove disease from the mastoid air cells or mastoid antrum. This code is distinguished from 69632 (tympanoplasty with ossicular chain reconstruction without mastoidotomy) by the addition of mastoid bone dissection, and from 69637 (tympanoplasty with mastoidotomy and synthetic prosthesis) by the use of autologous bone rather than a PORP or TORP for ossicular reconstruction.
Chronic otitis media with tympanic membrane perforation is a persistent inflammatory condition of the middle ear that results in a permanent opening in the eardrum. When left untreated, chronic drainage, recurrent infections, conductive hearing loss, and erosion of the ossicular chain can occur. When chronic otitis media extends into the mastoid air cells, mastoidotomy is required to remove infected or cholesteatomatous tissue, and when the ossicular chain is damaged or eroded, reconstruction is necessary to restore the sound conduction mechanism.
This procedure may be performed in the following clinical contexts:
- Chronic Suppurative Otitis Media with Ossicular Erosion — When chronic infection has destroyed one or more ossicles, requiring reconstruction to restore hearing continuity
- Cholesteatoma with Ossicular Chain Involvement — When cholesteatoma (destructive skin growth in the middle ear) has extended into the mastoid and damaged the ossicular chain; disease is removed via mastoidotomy and ossicular function is restored
- Post-Inflammatory Tympanic Membrane Perforation with Conductive Hearing Loss — When a persistent perforation is present along with ossicular discontinuity or fixation documented on preoperative imaging or intraoperative exploration
- Recurrent or Chronic Otitis Media with Mastoid Extension — When disease involves both the middle ear and mastoid antrum or peripheral mastoid air cells, requiring mastoidotomy access
- Failed Prior Tympanoplasty Requiring Ossicular Reconstruction and Mastoid Clearance — When revision tympanoplasty is necessary and mastoid disease has developed since the initial surgery
🔬 Anatomical & Procedural Considerations
| Approach | Steps | Key Notes |
|---|---|---|
| Postauricular Incision | Incision is made behind the ear in the postauricular crease; soft tissue dissection to expose the mastoid cortex; tympanomeatal flap is elevated for access to the middle ear | Most common approach; provides excellent visualization for mastoidotomy and ossicular reconstruction |
| Endaural / Transcanal Extended Approach | Incision through the ear canal (endaural); mastoid antrum is accessed through a limited antrostomy | Used when disease is limited to the mastoid antrum; less common for ossicular reconstruction due to restricted visualization |
| Mastoidotomy / Antrostomy | Bone is drilled to access the mastoid antrum and/or peripheral mastoid air cells; disease (cholesteatoma, granulation, infected mucosa) is removed; scutum may be removed for visualization | Distinguishes this code from 69632 (no mastoid dissection); documentation must clearly state that the mastoid was opened and disease was removed |
| Ossicular Chain Reconstruction | Diseased or eroded ossicles are removed or repositioned; autologous bone (incus body reshaped, cortical bone, tragal cartilage) is sculpted and placed to restore ossicular continuity | Use of autologous bone (not synthetic prosthesis) is the defining feature of 69636; when PORP or TORP is used, report 69637 instead |
| Tympanic Membrane Graft | Temporalis fascia or other graft material is harvested (if through the same incision, bundled; if separate incision, separately reportable); graft is placed under (underlay/medial) or over (overlay/lateral) the tympanic membrane remnant | Graft placement is bundled into the tympanoplasty; separate graft harvest code reportable only if obtained through a different incision |
| Packing and Closure | Gelfoam or absorbable packing is placed in the middle ear to support the graft and ossicular reconstruction; ear canal is packed; incisions are closed | Post-op packing removal is bundled into the 90-day global period |
Clinical Pearl
The key documentation requirement to support CPT 69636 is explicit mention of (1) mastoidotomy or antrostomy with removal of mastoid disease, and (2) ossicular chain reconstruction using the patient’s own bone or reshaped ossicle. If a synthetic prosthesis (PORP or TORP) is used instead, the correct code is 69637. If no ossicular reconstruction is performed, the correct code is 69635. Coders must query the surgeon if the operative note states “ossiculoplasty” without specifying autologous bone vs. prosthesis.
✅ Procedure Includes
- Pre-procedure otoscopic examination and audiometric assessment of middle ear and mastoid disease
- Local anesthesia with or without sedation, or general anesthesia (general anesthesia separately billable under 00120 or 00124)
- Postauricular or endaural incision and soft tissue dissection
- Mastoidotomy or antrostomy: drilling of mastoid bone to access the mastoid antrum and/or peripheral air cells
- Removal of disease from the mastoid (cholesteatoma, granulation tissue, infected mucosa, polyps)
- Elevation of tympanomeatal flap for middle ear access
- Middle ear exploration, removal of middle ear disease, lysis of adhesions
- Ossicular chain reconstruction using autologous bone (reshaped incus, cortical bone, or cartilage)
- Tympanic membrane graft harvest (if through the same incision) and placement (underlay or overlay technique)
- Canalplasty (widening of the external auditory canal for visualization, when performed)
- Atticotomy (opening into the epitympanic recess to remove disease, when performed)
- Placement of absorbable packing in the middle ear and ear canal
- Closure of incisions and application of dressings
- All routine post-operative visits within the 90-day global window, including packing removal, suture removal, audiometric follow-up, and wound checks
❌ Excludes / Do Not Report Together
| Code | Description | Relationship to 69636 |
|---|---|---|
| 69632 | Tympanoplasty without mastoidectomy; with ossicular chain reconstruction | Do not report together when performed on the same ear at the same session; 69636 subsumes the tympanoplasty and ossicular reconstruction elements of 69632 and adds mastoidotomy |
| 69635 | Tympanoplasty with antrotomy or mastoidotomy; without ossicular chain reconstruction | Do not report together when performed on the same ear at the same session; 69636 includes all elements of 69635 plus ossicular chain reconstruction |
| 69637 | Tympanoplasty with antrotomy or mastoidotomy; with ossicular chain reconstruction and synthetic prosthesis (PORP or TORP) | Mutually exclusive — report 69636 when autologous bone is used; report 69637 when a synthetic prosthesis (PORP or TORP) is used |
| 69641 | Tympanoplasty with mastoidectomy; without ossicular chain reconstruction | More extensive mastoid dissection than 69636 (mastoidectomy vs. mastoidotomy); do not report together when performed on the same ear at the same session |
| 69642 | Tympanoplasty with mastoidectomy; with ossicular chain reconstruction | More extensive mastoid dissection than 69636 (mastoidectomy vs. mastoidotomy); when full mastoidectomy is performed, report 69642 instead of 69636 |
| 69620 | Myringoplasty (surgery confined to drumhead and donor area) | Do not report separately; myringoplasty is bundled into 69636 when the middle ear is entered and inspected |
| 69433 | Tympanostomy (requiring insertion of ventilating tube), local or topical anesthesia | Do not report separately when performed on the same ear at the same session; tube placement is bundled into tympanoplasty |
| E/M codes (99202-99215) | Office or outpatient visit, new or established patient | Separately reportable only when modifier -25 is appended to the E/M code, documenting a significant, separately identifiable E/M service beyond the routine pre-procedure assessment |
Bundling Alert — Global Period is 090 (90 days), Not 010
CPT 69636 carries a 90-day global period, meaning all routine post-operative follow-up visits, suture and packing removal, audiometric testing, and wound checks within 90 days of surgery are bundled into the surgical payment and cannot be billed separately. To bill an E/M visit during the global window for an unrelated condition, append modifier -24 to the E/M code and document the unrelated nature of the visit explicitly in the note. To bill a related but staged or planned procedure during the global window, append modifier -58 to the second procedure code. The most common audit finding is inappropriate separate billing for routine post-op packing removal or audiogram follow-up within the global period.
🌳 Code Tree — Surgery: Auditory System
CPT 69000-69979 Surgery: Auditory System
│
├── 69000-69399 External Ear
│
├── 69400-69499 Middle Ear
│ ├── 69420-69421 Myringotomy
│ ├── 69433-69436 Tympanostomy
│ ├── 69440-69450 Middle Ear Exploration and Decompression
│ ├── 69501-69511 Mastoidectomy
│ ├── 69601-69604 Revision Mastoidectomy
│ ├── 69620 Myringoplasty (surgery confined to drumhead and donor area)
│ └── 69631-69646 Tympanoplasty (Repair Procedures on the Middle Ear)
│ ├── 69631 Tympanoplasty without mastoidectomy; without ossicular chain reconstruction (Global: 090)
│ ├── 69632 Tympanoplasty without mastoidectomy; with ossicular chain reconstruction (Global: 090)
│ ├── 69633 Tympanoplasty without mastoidectomy; with ossicular chain reconstruction and synthetic prosthesis (PORP or TORP) (Global: 090)
│ ├── 69635 Tympanoplasty with antrotomy or mastoidotomy; without ossicular chain reconstruction (Global: 090)
│ ├── ▶▶ 69636 ◀◀ Tympanoplasty with antrotomy or mastoidotomy; with ossicular chain reconstruction ← YOU ARE HERE (Global: 090)
│ ├── 69637 Tympanoplasty with antrotomy or mastoidotomy; with ossicular chain reconstruction and synthetic prosthesis (PORP or TORP) (Global: 090)
│ ├── 69641 Tympanoplasty with mastoidectomy; without ossicular chain reconstruction (Global: 090)
│ ├── 69642 Tympanoplasty with mastoidectomy; with ossicular chain reconstruction (Global: 090)
│ ├── 69643 Tympanoplasty with mastoidectomy; with intact or reconstructed wall, without ossicular chain reconstruction (Global: 090)
│ ├── 69644 Tympanoplasty with mastoidectomy; with intact or reconstructed wall, with ossicular chain reconstruction (Global: 090)
│ ├── 69645 Tympanoplasty with mastoidectomy; radical or complete, without ossicular chain reconstruction (Global: 090)
│ └── 69646 Tympanoplasty with mastoidectomy; radical or complete, with ossicular chain reconstruction (Global: 090)
│
├── 69650-69676 Other Procedures
│
└── 69700-69979 Inner Ear / Temporal Bone, Middle Fossa Approach
💰 RVU & Reimbursement Profile
| Component | Value |
|---|---|
| Work RVU (wRVU) | 17.69 (verify against current CMS MPFS for applicable year) |
| Global Period | 090 (90 days) |
| Bilateral Indicator | 0 — Procedure is not subject to bilateral payment adjustment; bilateral same-session performance is clinically rare |
| Assistant Surgeon | ✅ Payable — Medicare Assistant Surgeon Indicator is “2” (assistant surgeon payable; reimbursed at 16% of the primary surgeon fee when modifier -80, -81, -82, or -AS is appended) |
| Co-Surgeon | ✅ Applicable — Medicare Co-Surgeon Indicator is “1” (co-surgeons could be paid with appropriate documentation of medical necessity; each surgeon reports modifier -62) |
| Team Surgery | ❌ Not applicable |
| PC/TC Split | ❌ No — procedure code only (Indicator 0); no professional/technical component split |
| Modifier -51 Exempt | No |
| Anesthesia | General anesthesia is typical; separately billable under CPT 00120 (anesthesia for procedures on external, middle, and inner ear, not otherwise specified) or 00124 (anesthesia for otoscopy) |
Bilateral Billing Rules
CPT 69636 has a bilateral indicator of 0, meaning the procedure is not subject to bilateral payment adjustment rules. Bilateral same-session tympanoplasty with mastoidotomy and ossicular reconstruction is clinically extremely rare — performing the procedure on both ears at the same operative session is almost never medically appropriate. If it were performed bilaterally, each side would be reported on a separate claim line with modifier -RT or -LT, and both sides would be paid at 100% of the fee schedule amount (no 150% bilateral reduction rule applies). Medicare and most commercial payers would subject such a claim to medical necessity review.
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -RT | Right Side | Procedure performed on the right ear |
| -LT | Left Side | Procedure performed on the left ear |
| -50 | Bilateral Procedure | Clinically inappropriate for 69636 — bilateral same-session tympanoplasty with mastoidotomy is almost never performed; if performed, report two separate lines with -RT and -LT instead of -50 |
| -25 | Significant, Separately Identifiable E/M | Applied to the E/M code — not 69636 — when an office visit is performed on the same date as the decision for surgery; documentation must support a separate, medically necessary evaluation beyond the standard pre-procedure assessment |
| -24 | Unrelated E/M During Postoperative Period | Applied to the E/M code when a patient returns within the 90-day global window for a condition unrelated to the tympanoplasty; document the unrelated nature explicitly (e.g., “Patient returns for unrelated upper respiratory infection; surgical ear healing well”) |
| -51 | Multiple Procedures | When 69636 is performed alongside other surgical procedures at the same session; apply to the lower-valued code; multiple procedure payment reduction rules apply (50% reduction on second procedure) |
| -59 | Distinct Procedural Service | When payers inappropriately bundle 69636 with another procedure; documents distinct anatomic site (e.g., 69636-LT performed with unrelated nasal procedure on same date) |
| -80 | Assistant Surgeon | Applied by the assistant surgeon (physician) when providing full assistance to the primary surgeon; paid at 16% of the primary surgeon fee |
| -81 | Minimum Assistant Surgeon | Applied by the assistant surgeon when providing minimal assistance; rarely used for 69636 |
| -82 | Assistant Surgeon (when a qualified resident surgeon is not available in a teaching facility) | Applied by the assistant surgeon (physician) in teaching hospitals when no resident is available; documentation must support resident unavailability |
| -AS | Physician Assistant, Nurse Practitioner, or Clinical Nurse Specialist Services for Assistant at Surgery | Applied by non-physician practitioners serving as assistants; paid at 13.6% (85% of the 16% assistant surgeon fee) |
| -52 | Reduced Services | Procedure partially completed — document reason (e.g., “Ossicular reconstruction planned but abandoned due to unexpected fixation of stapes footplate”) |
| -53 | Discontinued Procedure | Procedure stopped due to patient safety concern; document reason thoroughly (e.g., “Procedure discontinued after mastoidotomy due to unexpected bleeding and patient instability”) |
| -58 | Staged or Related Procedure During Postoperative Period | Planned staged procedure during the 90-day global window (e.g., second-stage ossiculoplasty, planned revision tympanoplasty); resets the global period |
| -78 | Unplanned Return to OR for Related Procedure During Postoperative Period | Unplanned return for complication during the 90-day global period (e.g., graft failure requiring revision within 90 days); paid at reduced rate (intra-operative portion only, no pre- or post-op payment) |
| -79 | Unrelated Procedure During Postoperative Period | Unrelated procedure performed during the 90-day global window (e.g., nasal surgery performed 30 days after tympanoplasty); resets the global period for the new procedure |
🩺 Common ICD-10-CM Pairings
Chronic Suppurative Otitis Media
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| H66.3X2 | Other chronic suppurative otitis media, left ear | ❌ No | Most specific code when chronic suppurative otitis media is documented with laterality; query provider for “suppurative” vs. “non-suppurative” if documentation is ambiguous |
| H66.3X1 | Other chronic suppurative otitis media, right ear | ❌ No | Use when chronic suppurative otitis media is documented in the right ear |
| H66.3X3 | Other chronic suppurative otitis media, bilateral | ❌ No | Use when chronic suppurative otitis media is documented as bilateral; note that bilateral diagnosis does not support bilateral same-session surgery |
Perforation of Tympanic Membrane
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| H72.821 | Total perforations of tympanic membrane, right ear | ❌ No | When total (subtotal or near-total) perforation is documented; Code first any associated otitis media (H66.3X1); perforation codes are secondary to the underlying chronic otitis media |
| H72.822 | Total perforations of tympanic membrane, left ear | ❌ No | When total perforation is documented in the left ear |
| H72.823 | Total perforations of tympanic membrane, bilateral | ❌ No | Bilateral perforation; use only when both ears are documented with total perforation |
| H72.11 | Attic perforation of tympanic membrane, right ear | ❌ No | When perforation is specifically located in the attic (pars flaccida); supports medical necessity for atticotomy component of 69636 |
| H72.12 | Attic perforation of tympanic membrane, left ear | ❌ No | Left-sided attic perforation |
| H72.01 | Central perforation of tympanic membrane, right ear | ❌ No | When perforation is located in the pars tensa (central portion of the eardrum) |
| H72.02 | Central perforation of tympanic membrane, left ear | ❌ No | Left-sided central perforation |
Ossicular Chain Disorders
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| H74.21 | Discontinuity and dislocation of right ear ossicles | ❌ No | When ossicular discontinuity is documented on preoperative CT or intraoperative findings; supports medical necessity for ossicular chain reconstruction |
| H74.22 | Discontinuity and dislocation of left ear ossicles | ❌ No | Left-sided ossicular discontinuity |
| H74.23 | Discontinuity and dislocation of ear ossicles, bilateral | ❌ No | Bilateral ossicular discontinuity; note that bilateral diagnosis does not support bilateral same-session surgery |
| H74.31 | Ankylosis of ear ossicles, right ear | ❌ No | When ossicular fixation is documented; may require ossiculoplasty rather than simple repositioning |
| H74.32 | Ankylosis of ear ossicles, left ear | ❌ No | Left-sided ossicular fixation |
Cholesteatoma
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| H71.01 | Cholesteatoma of attic, right ear | ❌ No | When cholesteatoma is limited to the attic (epitympanic recess); supports mastoidotomy to remove disease |
| H71.02 | Cholesteatoma of attic, left ear | ❌ No | Left-sided attic cholesteatoma |
| H71.11 | Cholesteatoma of tympanum, right ear | ❌ No | When cholesteatoma involves the tympanic cavity (middle ear proper) |
| H71.12 | Cholesteatoma of tympanum, left ear | ❌ No | Left-sided tympanic cholesteatoma |
| H71.21 | Cholesteatoma of mastoid, right ear | ❌ No | When cholesteatoma has extended into the mastoid; strongly supports medical necessity for mastoidotomy |
| H71.22 | Cholesteatoma of mastoid, left ear | ❌ No | Left-sided mastoid cholesteatoma |
Conductive Hearing Loss
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| H90.11 | Conductive hearing loss, unilateral, right ear, with unrestricted hearing on the contralateral side | ❌ No | Supports medical necessity for ossicular reconstruction; use when preoperative audiometry documents conductive hearing loss |
| H90.12 | Conductive hearing loss, unilateral, left ear, with unrestricted hearing on the contralateral side | ❌ No | Left-sided conductive hearing loss |
| H90.0 | Conductive hearing loss, bilateral | ❌ No | Bilateral conductive hearing loss; note that bilateral diagnosis does not support bilateral same-session surgery |
Coding Specificity Reminder
The most common specificity gap for tympanoplasty coding is laterality. Every ICD-10-CM diagnosis code for chronic otitis media, tympanic membrane perforation, ossicular disorder, and cholesteatoma requires 6th or 7th character laterality specification (1 = right, 2 = left, 3 = bilateral, 9 = unspecified). Unspecified laterality codes (character 9) should be avoided whenever the operative report documents the surgical side. If the documentation states “chronic otitis media” without specifying right or left, but the CPT code is billed with modifier -RT, query the surgeon to confirm laterality for the diagnosis code. ICD-10-CM specificity requirements are not optional — accurate coding requires complete documentation.
🏥 MS-DRG Considerations (Inpatient)
Inpatient Coding Reminder
CPT 69636 is performed exclusively in the outpatient or ambulatory surgical center (ASC) setting. There are no routine MS-DRG assignments for this procedure — inpatient admission for tympanoplasty with mastoidotomy would not be supported by any payer, MAC, or utilization review body. If a patient undergoing an inpatient admission for an unrelated diagnosis also has tympanoplasty with mastoidotomy performed (e.g., incidental same-hospitalization surgery for unrelated trauma or infection), an ICD-10-PCS code may be assigned for completeness, but it will have no meaningful impact on DRG grouping. See the ICD-10-PCS section below.
🔧 ICD-10-PCS Equivalents (Inpatient Facility Coding)
Note
Inpatient PCS coding for tympanoplasty is extremely rare — this procedure is almost never performed in the inpatient setting. When it is coded using ICD-10-PCS (e.g., incidental to an inpatient stay for unrelated diagnosis), the PCS codes below may be assigned. The PCS root operation for tympanic membrane repair is Repair (Q), and for ossicular chain reconstruction, the root operation is Reposition (S) when the patient’s own bone is repositioned, or Supplement (U) when additional material (autograft or synthetic) is used. PCS does not influence DRG assignment for this procedure.
| PCS Code | Full Description | Applicable Component |
|---|---|---|
09Q80ZZ | Repair Right Tympanic Membrane, Open Approach | Tympanic membrane graft and repair (right ear) |
09Q90ZZ | Repair Left Tympanic Membrane, Open Approach | Tympanic membrane graft and repair (left ear) |
09SN07Z | Reposition Right Auditory Ossicle, Open Approach | Ossicular chain reconstruction using repositioned autologous bone (right ear) |
09SP07Z | Reposition Left Auditory Ossicle, Open Approach | Ossicular chain reconstruction using repositioned autologous bone (left ear) |
09UN07Z | Supplement Right Auditory Ossicle with Autologous Tissue Substitute, Open Approach | When reshaped autologous bone or cartilage is used to supplement (not just reposition) the ossicular chain (right ear) |
09UP07Z | Supplement Left Auditory Ossicle with Autologous Tissue Substitute, Open Approach | When reshaped autologous bone or cartilage is used to supplement the ossicular chain (left ear) |
PCS Character Analysis — 09Q80ZZ
| Position | Character | Value | Definition |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical |
| 2 | Body System | 9 | Ear, Nose, Sinus |
| 3 | Root Operation | Q | Repair (Restoring, to the extent possible, a body part to its normal anatomic structure and function) |
| 4 | Body Part | 8 | Right Tympanic Membrane |
| 5 | Approach | 0 | Open |
| 6 | Device | Z | No Device |
| 7 | Qualifier | Z | No Qualifier |
PCS Root Operation: Repair (Q) vs. Reposition (S) vs. Supplement (U)
- Use Repair (Q) for tympanic membrane graft placement when the goal is to restore the normal anatomic structure of the eardrum
- Use Reposition (S) when the ossicular chain is reconstructed by moving the patient’s own ossicles (e.g., repositioning the incus or malleus) without adding additional material
- Use Supplement (U) when the ossicular chain reconstruction involves adding autologous tissue (reshaped incus, cortical bone graft, or tragal cartilage) to supplement the existing ossicles
- When bilateral tympanoplasty is performed (clinically rare), assign separate PCS code lines for each side treated — PCS has no modifier equivalent for bilateral procedures
📝 Coding Examples
Example 1 — Outpatient Hospital: Chronic Suppurative Otitis Media with Ossicular Erosion
Clinical Scenario: A 42-year-old male with a 10-year history of recurrent left ear drainage presents with persistent tympanic membrane perforation and progressive conductive hearing loss. Preoperative CT scan shows erosion of the incus long process and opacification of the mastoid antrum. The otolaryngologist performs a left tympanoplasty with mastoidotomy, removes cholesteatoma from the mastoid antrum and attic, reconstructs the ossicular chain using the reshaped incus body as an interposition graft between the malleus and stapes capitulum, and places a temporalis fascia graft over the tympanic membrane perforation. The operative note states: “Left postauricular incision; cortical mastoidectomy performed; cholesteatoma removed from mastoid antrum and epitympanic recess; tympanomeatal flap elevated; middle ear entered and inspected; incus long process eroded; incus body removed, reshaped, and repositioned as interposition graft from malleus to stapes; temporalis fascia harvested through same incision and placed as underlay graft; ear canal packed with Gelfoam.” No separate E/M was documented on the date of surgery.
| Field | Code | Rationale |
|---|---|---|
| CPT | 69636-LT | Tympanoplasty with mastoidotomy and ossicular chain reconstruction using autologous bone (reshaped incus); left ear modifier |
| PDx | H66.3X2 | Chronic suppurative otitis media, left ear — most specific primary diagnosis |
| SDx | H74.22 | Discontinuity and dislocation of left ear ossicles — supports medical necessity for ossicular reconstruction |
| SDx | H71.22 | Cholesteatoma of mastoid, left ear — supports medical necessity for mastoidotomy |
Note
No separate E/M is billable on the date of surgery unless a significant, separately identifiable evaluation was performed and documented. The pre-procedure otoscopic examination and discussion of surgical consent are bundled into the surgical payment. If the patient had been seen for an unrelated problem (e.g., hypertension medication refill) on the same date, modifier -25 could be appended to the E/M code with documentation supporting the unrelated service.
Example 2 — ASC: Bilateral Chronic Otitis Media, Left Ear Surgery Only
Clinical Scenario: A 35-year-old female with bilateral chronic suppurative otitis media and bilateral tympanic membrane perforations elects to undergo left tympanoplasty with mastoidotomy and ossicular reconstruction first, with plans to address the right ear in 6 months if the left ear result is successful. Preoperative audiometry shows bilateral conductive hearing loss (air-bone gap 40 dB on the left, 35 dB on the right). The surgeon performs left tympanoplasty with antrostomy, removes granulation tissue from the mastoid antrum, reconstructs the ossicular chain using cortical bone harvested from the mastoid cortex, and places a fascia graft. The patient is seen in the office 1 week post-op for packing removal (bundled into the global period), and again at 6 weeks for audiometric follow-up (bundled).
| Field | Code | Rationale |
|---|---|---|
| CPT | 69636-LT | Tympanoplasty with mastoidotomy and ossicular chain reconstruction; left ear only |
| PDx | H66.3X2 | Chronic suppurative otitis media, left ear — primary diagnosis for the surgical ear |
| SDx | H72.822 | Total perforation of tympanic membrane, left ear — secondary diagnosis supporting surgical indication |
| SDx | H90.12 | Conductive hearing loss, unilateral, left ear, with unrestricted hearing on the contralateral side — supports medical necessity for ossicular reconstruction |
Note
Even though the patient has bilateral disease, only the left ear was treated at this operative session. The right ear diagnosis codes are not reported on this claim. If the right ear is treated in a separate session (e.g., 6 months later), a new claim will be submitted with right-sided diagnosis codes and CPT 69636-RT. The 90-day global period for the left ear will have expired by the time the right ear is treated, so no global period conflict exists.
Example 3 — Outpatient Hospital: Revision Tympanoplasty with Mastoid Extension, Same-Day E/M for Unrelated Condition
Clinical Scenario: A 50-year-old male with a history of right tympanoplasty 8 years ago presents to the otolaryngology clinic for follow-up of chronic rhinosinusitis. During the visit, he mentions new-onset right ear drainage over the past 3 months. The physician performs a comprehensive E/M evaluation for the rhinosinusitis, prescribes nasal steroid spray, and also evaluates the right ear, finding recurrent tympanic membrane perforation with mastoid tenderness. CT scan ordered and performed 2 weeks later shows cholesteatoma extending into the mastoid. The patient returns for surgery 4 weeks after the initial visit. The surgeon performs right tympanoplasty with mastoidotomy, removes cholesteatoma from the mastoid and middle ear, reconstructs the ossicular chain using reshaped incus, and places a fascia graft. The operative note documents: “Revision right tympanoplasty with cortical mastoidectomy; extensive cholesteatoma removed from mastoid antrum, attic, and middle ear; incus eroded and reshaped for interposition grafting; tympanic membrane repaired with fascia underlay graft.”
| Field | Code | Rationale |
|---|---|---|
| CPT 1 | 99214-25 | Office visit for chronic rhinosinusitis (unrelated to the ear surgery decision); modifier -25 indicates significant, separately identifiable E/M service on the same date as the decision for surgery |
| CPT 2 | 69636-RT | Revision tympanoplasty with mastoidotomy and ossicular chain reconstruction; right ear |
| PDx | J32.9 | Chronic rhinosinusitis, unspecified — primary diagnosis for the E/M visit |
| SDx | H66.3X1 | Chronic suppurative otitis media, right ear — primary diagnosis for the surgical procedure |
| SDx | H71.21 | Cholesteatoma of mastoid, right ear — supports medical necessity for mastoidotomy |
| SDx | H74.21 | Discontinuity and dislocation of right ear ossicles — supports ossicular reconstruction |
Warning
Modifier -25 placement: Modifier -25 is applied to the E/M code (99214), not to the surgical procedure code (69636). The documentation must clearly support that the E/M service was significant and separately identifiable from the pre-operative assessment bundled into the surgical procedure. In this case, the E/M was for chronic rhinosinusitis (unrelated diagnosis), and the ear evaluation was documented as a secondary finding that led to the surgical decision. If the E/M had been solely for the purpose of deciding to proceed with surgery for the ear condition, modifier -25 would not be appropriate, and the visit would be considered part of the global surgical package.
⚠️ Common Coding Pitfalls
-
Missing documentation of autologous bone vs. synthetic prosthesis: The distinction between CPT 69636 (autologous bone ossicular reconstruction) and 69637 (synthetic prosthesis PORP or TORP) is the type of material used for ossicular reconstruction. If the operative note states “ossiculoplasty” or “ossicular reconstruction” without specifying whether the surgeon used the patient’s own bone (reshaped incus, cortical bone, cartilage) or a synthetic prosthesis, query the surgeon before coding. If a PORP or TORP was used, the correct code is 69637, not 69636. Upcoding from 69635 (no ossicular reconstruction) to 69636 without documentation of bone grafting is a high-risk audit target.
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Confusing mastoidotomy vs. mastoidectomy: CPT 69636 describes tympanoplasty with antrotomy or mastoidotomy (limited dissection into the mastoid antrum or peripheral air cells). If the operative note documents a mastoidectomy (more extensive dissection, including removal of the common wall between the mastoid and ear canal, or radical/complete mastoidectomy), the correct code is 69642 (tympanoplasty with mastoidectomy and ossicular chain reconstruction), not 69636. The distinction is based on the extent of mastoid dissection, not the presence of mastoid disease. Query the surgeon if the documentation is ambiguous.
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Billing routine post-operative visits separately during the 90-day global period: CPT 69636 has a 90-day global period, meaning all routine post-operative visits, packing removal, suture removal, audiometric follow-up, and wound checks within 90 days of surgery are bundled into the surgical payment and cannot be billed separately. To bill an E/M visit during the global window, the visit must be for an unrelated condition (append modifier -24 to the E/M code) or for a complication requiring significant additional E/M work beyond routine post-op care (append modifier -24 and document the complication explicitly). The most common compliance finding is inappropriate separate billing for routine post-op packing removal (CPT 69200 or E/M code without modifier) within the global period.
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Reporting 69636 and 69635 together for the same ear at the same session: CPT 69636 subsumes all elements of 69635 (tympanoplasty with mastoidotomy without ossicular reconstruction) and adds ossicular chain reconstruction. Do not report both codes for the same ear at the same session. If ossicular reconstruction was performed, report 69636 only. If no ossicular reconstruction was performed, report 69635 only. Reporting both codes will result in denial for bundling or duplicate billing.
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Defaulting to unspecified laterality ICD-10-CM codes without querying: Every ICD-10-CM diagnosis code for chronic otitis media, tympanic membrane perforation, ossicular disorder, and cholesteatoma requires 6th or 7th character laterality specification (1 = right, 2 = left, 3 = bilateral, 9 = unspecified). If the operative note documents “left tympanoplasty with mastoidotomy” but the diagnosis is documented only as “chronic otitis media” without laterality, query the surgeon to confirm the laterality for the diagnosis code. Do not default to unspecified laterality codes (character 9) when the surgical side is clearly documented. Unspecified codes may trigger payer denials for lack of specificity or medical necessity.
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Failing to track the 90-day global window for subsequent unrelated procedures or E/M visits: Billing staff must flag the surgical date and track the 90-day global window to prevent inappropriate separate billing for routine post-op care. If a patient returns within the global window for an unrelated E/M visit (e.g., upper respiratory infection), append modifier -24 to the E/M code and document the unrelated nature of the visit explicitly. If a patient requires a second, unrelated surgical procedure during the global window, append modifier -79 to the second procedure code. Failure to track the global period can result in overpayment, payer recoupment, and potential fraud investigation.
📎 Sources
AMA CPT 2025 Professional Edition · CMS 2025 Medicare Physician Fee Schedule Final Rule (CMS-1807-F) · CMS RVU25A Relative Value Files · NCCI Policy Manual Chapter 4, CMS 2024-2025 · ICD-10-CM Official Guidelines for Coding and Reporting FY2025 · ICD-10-PCS Official Guidelines for Coding and Reporting FY2025 · American Academy of Otolaryngology-Head and Neck Surgery — “CPT for ENT: Tympanoplasty” (Revised October 2023) · AAPC Otolaryngology Coding Alert — “Distinguish Wall Up, Wall Down, OCRs to Boost Mastoidectomy Coding” (April 2010) · CMS Medicare Claims Processing Manual, Chapter 12 — Physicians/Nonphysician Practitioners, Section 40 — Surgeons and Global Surgery · Novitas Solutions Medicare Part B — “Assistant at Surgery Modifiers Fact Sheet” (2024)