Crystal's MCW Coder Hub⚕️ICD-10-CM E10.3591 - Type 1 Diabetes Mellitus with Proliferative Diabetic Retinopathy Without Macular Edema, Right Eye
Full Official Descriptor: Type 1 diabetes mellitus with proliferative diabetic retinopathy without macular edema, right eye
ICD-10-CM Chapter: Chapter 4 - Endocrine, Nutritional and Metabolic Diseases (E00-E89) Block: E10 - Type 1 Diabetes Mellitus Billable/Specific Code: ✅ Yes — valid and billable FY2024-FY2026 Laterality: Right Eye (7th character = 1)
🔬 Clinical Overview
Proliferative Diabetic Retinopathy (PDR) is the most advanced and visually threatening stage of diabetic retinopathy. It is defined by the development of pathological neovascularization — the growth of abnormal, fragile new blood vessels — driven by retinal ischemia and the upregulation of vascular endothelial growth factor (VEGF). These new vessels arise from the optic disc (Neovascularization of the Disc, NVD) or from the retinal surface and peripheral retina (Neovascularization Elsewhere, NVE) and extend into the vitreous cavity.
Unlike the nonproliferative stages (mild, moderate, severe NPDR), PDR carries a high risk of catastrophic vision loss from:
- Vitreous hemorrhage (VH) — bleeding from fragile neovascular complexes into the vitreous cavity, causing sudden painless vision loss
- Traction retinal detachment (TRD) — fibrovascular proliferation contracting and pulling the retina off the retinal pigment epithelium (RPE)
- Combined traction-rhegmatogenous retinal detachment — the most complex and surgically challenging variant
- Rubeosis iridis / Neovascular glaucoma (NVG) — anterior segment ischemia with iris neovascularization causing intractable glaucoma and potentially irreversible blindness
E10.3591 specifically captures PDR in the right eye of a Type 1 DM patient where diabetic macular edema (DME) is NOT present. This distinction is clinically and financially critical — the presence or absence of macular edema determines different treatment pathways (e.g., anti-VEGF for DME vs. PRP laser for neovascularization alone) and mandates separate, specific codes.
PDR Subtypes and Their ICD-10 Distinctions (E10.35x Family)
| Subtype | Key Feature | Primary Treatment Consideration |
|---|---|---|
| PDR without macular edema (E10.3591) | NVD/NVE present; macula clear | PRP laser; anti-VEGF for NVD/NVE regression |
| PDR with macular edema (E10.3511) | NVD/NVE + DME | Anti-VEGF injection + PRP; focal/grid laser |
| PDR with TRD involving macula (E10.3521) | Fibrovascular traction on macula | Urgent pars plana vitrectomy (PPV) |
| PDR with TRD not involving macula (E10.3531) | Traction away from macula | Elective/urgent PPV depending on progression |
| PDR with combined TRD + RRD (E10.3541) | Both traction and rhegmatogenous detachment | Complex PPV — high surgical risk |
| Stable PDR (E10.3551) | Prior treatment with regression; monitored | Ongoing monitoring; repeat FA/OCT |
⚡ E10.3591 vs. E10.3551 — Critical Distinction: E10.3591 = Active PDR without macular edema (neovascularization present, not yet treated or still active) E10.3551 = Stable PDR (previously treated, neovascularization has regressed with treatment — e.g., post-PRP) Do not default to E10.3591 after successful PRP when the physician documents the PDR as stable or regressed — use E10.3551 instead.
📋 Code Details
| Field | Detail |
|---|---|
| ICD-10-CM Code | E10.3591 |
| Full Descriptor | Type 1 diabetes mellitus with proliferative diabetic retinopathy without macular edema, right eye |
| Chapter | Chapter 4 - Endocrine, Nutritional and Metabolic Diseases |
| Block | E10 - Type 1 Diabetes Mellitus |
| Parent Code | E10.359 (non-billable; requires 7th character laterality) |
| Billable | ✅ Yes |
| Laterality | Right Eye — 7th character “1” |
| Macular Edema Present? | ❌ No — “without macular edema” is explicit in descriptor |
| PDR Stability | Active PDR — not documented as stable |
| wRVU | N/A — diagnosis code; wRVU belongs to paired CPT codes |
| Assistant Payable | N/A — diagnosis code |
| Valid FY | FY2024 - FY2026 (confirmed active) |
| POA Indicator Required | ✅ Yes — required for inpatient UB-04 claims |
| Code Type | Combination code — captures T1DM + PDR stage + laterality + DME status |
⚠️ Combination Code Reminder: Per ICD-10-CM Official Guidelines Section I.C.4.a.2, E10.3591 is a combination code encoding both the Type 1 diabetes AND the specific retinal complication. Do not additionally assign a standalone retinopathy code from the H-chapter (e.g., H36.0X1) for diabetic retinopathy when a diabetic combination code already captures it. The diabetic complication is entirely expressed within E10.3591.
✅ Includes / Use Additional Code Instructions
Included Within E10.3591
- Type 1 (autoimmune, insulin-dependent, juvenile-onset, brittle, ketosis-prone) diabetes mellitus
- Active proliferative diabetic retinopathy (NVD and/or NVE present)
- Right eye laterality specified
- Absence of diabetic macular edema (DME) in right eye at this encounter
Use Additional Codes (Per ICD-10-CM Tabular Instruction, E10.-)
| Additional Code | Description | Application |
|---|---|---|
| Z79.4 | Long-term (current) use of insulin | ✅ Apply to virtually all T1DM claims — insulin dependence is inherent |
| Z79.85 | Long-term use of injectable non-insulin antidiabetic drugs | Apply if concurrent GLP-1 agonist documented |
| Z79.84 | Long-term use of oral antidiabetic drugs | Apply if concurrent oral agent documented (uncommon in T1DM) |
| H35.81 | Retinal edema | Only if separately documented retinal edema distinct from DME |
| H43.1- | Vitreous hemorrhage | Code separately if vitreous hemorrhage is present and documented (e.g., H43.11 right eye) |
| H44.2X1 | Degenerative myopia with choroidal neovascularization, right eye | Only if additionally documented and distinct from diabetic pathology |
📌 Vitreous Hemorrhage Coding Tip: When PDR is complicated by a vitreous hemorrhage documented in the same encounter, assign both E10.3591 (PDR without DME, right eye) and H43.11 (vitreous hemorrhage, right eye) per the “use additional code” instructional note. The PDR code does not inherently capture VH unless you assign the additional ophthalmic code — this is a commonly missed secondary diagnosis in retina practices and in inpatient coding.
🚫 Excludes
Excludes 1 (Mutually Exclusive — Cannot Code Together)
| Code | Description |
|---|---|
| E08.- | Diabetes mellitus due to underlying condition (Cushing’s, pancreatitis, etc.) |
| E09.- | Drug or chemical induced diabetes mellitus |
| E11.- | Type 2 diabetes mellitus |
| E13.- | Other specified diabetes mellitus (post pancreatectomy, post-procedural, secondary) |
| O24.4- | Gestational diabetes mellitus |
| P70.2 | Neonatal diabetes mellitus |
⚠️ Type 1 vs. Type 2 — Never Interchange: E10.3591 is exclusively for Type 1 DM. For the equivalent Type 2 PDR without macular edema right eye, use E11.3591. For secondary/other specified diabetes with PDR without ME right eye, use E13.3591. These categories are Excludes 1 — assigning both E10 and E11 codes simultaneously is a critical coding error.
Excludes 2 (May Code Together When Documented)
| Code | Description |
|---|---|
| H36.- | Retinal disorders in diseases classified elsewhere |
| N18.- | Chronic kidney disease |
| G63 | Polyneuropathy in diseases classified elsewhere |
🏷️ HCC Risk Adjustment Mapping
E10.3591 is an HCC-mapped diagnosis. Accurate documentation and annual code submission are essential for appropriate Medicare Advantage risk adjustment and value-based care reimbursement.
CMS-HCC Version 24 (V24) — Reference / Historical (Blend in 2025, Retired 2026)
| HCC | Category Name | RAF Contribution (approx.) |
|---|---|---|
| HCC 18 | Diabetes with Ophthalmologic Manifestations | ~0.200 (Community, Non-Dual, Aged) |
Under V24, PDR coded with E10.3591 contributed to HCC 18, which carried a meaningfully higher RAF than uncomplicated diabetes (HCC 19). This financial incentive rewarded accurate complication documentation.
CMS-HCC Version 28 (V28) — Fully Active as of 2026
| HCC | Category Name | RAF Contribution (approx.) |
|---|---|---|
| HCC 38 | Diabetes with Ophthalmologic or Unspecified Manifestation | ~0.166 (Constrained — same across all DM categories) |
⚠️ V28 Constraining Impact: Under the fully implemented V28 (2026), CMS applied constraining to the entire diabetes HCC hierarchy — meaning E10.3591 (PDR with complications) carries the same RAF coefficient (~0.166) as uncomplicated Type 2 DM (E11.9). The financial premium for coding complications has been eliminated in V28. This is one of the most consequential changes for ophthalmology, endocrinology, and retina billing in the V28 transition.
💡 Why Accurate Coding Still Matters in V28:
- Supports MIPS Measure #117 (Diabetes Eye Exam) quality performance reporting
- Establishes documented medical necessity for high-cost procedures (67228 PRP, 67028 anti-VEGF, 67036 vitrectomy)
- Drives appropriate inpatient MS-DRG assignment and severity of illness (SOI)
- Maintains clinical accuracy of the longitudinal problem list for care coordination
- Protects against undercoding audits in value-based and capitated contracts
- Supports total composite risk — coding all active comorbidities (hypertension, CKD, neuropathy, CAD) alongside PDR maximizes total patient RAF even if individual DM HCC contribution is constrained
🏥 MS-DRG Applicability
MS-DRG: ✅ Applicable for Inpatient Stays
When E10.3591 appears on an inpatient claim, it maps to the following MDC 10 (Endocrine, Nutritional and Metabolic Diseases) MS-DRGs per CMS MS-DRG V43.0 (FY2026):
| MS-DRG | Title | Trigger Condition |
|---|---|---|
| 637 | Diabetes with MCC | Principal DX = E10.3591 + qualifying MCC present (e.g., N17.9 acute kidney injury, sepsis) |
| 638 | Diabetes with CC | Principal DX = E10.3591 + qualifying CC present (e.g., I10 hypertension |
| 639 | Diabetes without CC/MCC | Principal DX = E10.3591 with no qualifying CC or MCC |
📌 Inpatient Sequencing Note: E10.3591 is an unlikely standalone principal inpatient diagnosis — PDR itself does not typically precipitate an inpatient admission. Far more commonly, this code will appear as a secondary diagnosis when a T1DM patient is admitted for:
- Diabetic ketoacidosis (DKA) — E10.10 or E10.11 as principal
- Hypoglycemic episode — E10.641 as principal
- Vitrectomy or retinal surgery admission — retinal procedure is the principal issue, E10.3591 as comorbidity
- Postoperative care for vitreoretinal surgery
As a secondary diagnosis, E10.3591 may function as a CC and bump an otherwise DRG 639 (no CC/MCC) assignment to a DRG 638 (with CC), increasing inpatient reimbursement. The exact CC status depends on the MS-DRG v43.0 CC/MCC list — verify via the CMS MS-DRG definitions manual.
POA (Present on Admission) Indicator:
- For pre-existing PDR: Y (Yes) — condition was present before admission
- For newly identified PDR during admission workup: W (Clinically Undetermined) if unclear, or N (No) if confirmed to be new onset during stay
🌳 Code Tree
E10.35 Full PDR Family — Right Eye Focus
E10 - Type 1 Diabetes Mellitus (non-billable)
│
└── E10.35 - T1DM with proliferative diabetic retinopathy (non-billable header)
│
├── E10.351 - T1DM with PDR with macular edema (non-billable header)
│ ├── E10.3511 - T1DM with PDR with macular edema, right eye
│ ├── E10.3512 - T1DM with PDR with macular edema, left eye
│ ├── E10.3513 - T1DM with PDR with macular edema, bilateral
│ └── E10.3519 - T1DM with PDR with macular edema, unspecified eye
│
├── E10.352 - T1DM with PDR with TRD involving macula (non-billable header)
│ ├── E10.3521 - T1DM with PDR with TRD involving macula, right eye
│ ├── E10.3522 - T1DM with PDR with TRD involving macula, left eye
│ ├── E10.3523 - T1DM with PDR with TRD involving macula, bilateral
│ └── E10.3529 - T1DM with PDR with TRD involving macula, unspecified eye
│
├── E10.353 - T1DM with PDR with TRD NOT involving macula (non-billable header)
│ ├── E10.3531 - T1DM with PDR with TRD not involving macula, right eye
│ ├── E10.3532 - T1DM with PDR with TRD not involving macula, left eye
│ ├── E10.3533 - T1DM with PDR with TRD not involving macula, bilateral
│ └── E10.3539 - T1DM with PDR with TRD not involving macula, unspecified eye
│
├── E10.354 - T1DM with PDR with combined TRD and rhegmatogenous RD (non-billable header)
│ ├── E10.3541 - T1DM with PDR with combined TRD + RRD, right eye
│ ├── E10.3542 - T1DM with PDR with combined TRD + RRD, left eye
│ ├── E10.3543 - T1DM with PDR with combined TRD + RRD, bilateral
│ └── E10.3549 - T1DM with PDR with combined TRD + RRD, unspecified eye
│
├── E10.355 - T1DM with stable PDR (non-billable header)
│ ├── E10.3551 - T1DM with stable PDR, right eye ⬅ Use AFTER successful treatment/regression
│ ├── E10.3552 - T1DM with stable PDR, left eye
│ ├── E10.3553 - T1DM with stable PDR, bilateral
│ └── E10.3559 - T1DM with stable PDR, unspecified eye
│
└── E10.359 - T1DM with PDR without macular edema (non-billable header)
├── E10.3591 - T1DM with PDR without macular edema, right eye ← YOU ARE HERE
├── E10.3592 - T1DM with PDR without macular edema, left eye
├── E10.3593 - T1DM with PDR without macular edema, bilateral
└── E10.3599 - T1DM with PDR without macular edema, unspecified eye
Diabetic Retinopathy Progression - T1DM Right Eye
| Stage | With Macular Edema | Without Macular Edema |
|---|---|---|
| Mild NPDR | E10.3211 | E10.3291 |
| Moderate NPDR | E10.3311 | E10.3391 |
| Severe NPDR | E10.3411 | E10.3491 |
| Active PDR | E10.3511 | E10.3591 ← YOU ARE HERE |
| Stable PDR (post-treatment) | E10.3551 | E10.3551 |
🔗 Associated CPT Procedure Codes
Since E10.3591 is a diagnosis code, it pairs with the following CPT procedure codes for evaluation, monitoring, and treatment of active PDR.
Diagnostic and Imaging
| CPT Code | Description | wRVU |
|---|---|---|
| 92134 | OCT of retina, unilateral or bilateral, with interpretation and report | 0.65 |
| 92235 | Fluorescein angiography (FA) with interpretation and report | 1.00 |
| 92250 | Fundus photography with interpretation and report | 0.44 |
| 92240 | ICG angiography with interpretation and report | 1.36 |
| 92228 | Remote imaging of retina, physician interpretation, low complexity | 0.42 |
Evaluation and Management
| CPT Code | Description | wRVU |
|---|---|---|
| 92004 | Comprehensive ophthalmological exam, new patient | 2.00 |
| 92014 | Comprehensive ophthalmological exam, established patient | 1.34 |
| 99213 | Office/outpatient visit, established, low complexity | 0.97 |
| 99214 | Office/outpatient visit, established, moderate complexity | 1.50 |
| 99215 | Office/outpatient visit, established, high complexity | 2.11 |
Treatment — Laser / Injection / Surgical
| CPT Code | Description | wRVU | Notes |
|---|---|---|---|
| 67028 | Intravitreal injection of pharmacologic agent (anti-VEGF) | 0.72 | Used for anti-VEGF (bevacizumab, ranibizumab, aflibercept, faricimab) to treat NVD/NVE or concurrent DME |
| 67210 | Photocoagulation, retinal lesion (focal or grid laser) | 5.31 | Used for focal DME; less relevant for PDR without DME but may apply if focal areas treated |
| 67228 | Treatment of extensive or progressive retinopathy, photocoagulation (PRP) | 7.29 | Primary treatment for PDR — panretinal photocoagulation; bilateral indicator = 1 (150% if bilateral) |
| 67036 | Vitrectomy, mechanical, pars plana approach | 14.97 | Indicated for non-clearing vitreous hemorrhage complicating PDR |
| 67041 | Vitrectomy with removal of preretinal cellular membrane | 17.68 | For fibrovascular membrane peeling in PDR |
| 67042 | Vitrectomy with removal of internal limiting membrane | 17.68 | May be used in complex PDR cases |
| 67043 | Vitrectomy with removal of subretinal membrane | 22.97 | Advanced fibrovascular proliferation cases |
| 67101 | Repair of retinal detachment by cryotherapy | 9.10 | Ancillary repair if TRD component present |
| 67108 | Repair of retinal detachment; with vitrectomy, any method | 22.97 | For combined TRD + rhegmatogenous detachment |
📌 67228 PRP Coding Note: CPT 67228 has a 10-day global period and a bilateral indicator of 1 (150% when bilateral). Per CMS Article A56594, 67228 should be reported only once per 10-day global period per eye, regardless of how many laser sessions occur within that period. If PRP is split across multiple sessions in the same eye within the global window, only the first session is billed — subsequent sessions within the global are considered part of the same service.
💡 Coding Examples
Example 1 - Established Retina Patient, Active PDR, PRP Performed (Office)
A 34-year-old established patient with T1DM (on insulin pump) presents with new onset NVD right eye identified on dilated fundus exam and confirmed on fluorescein angiography. No macular edema is present on OCT. The retina specialist performs panretinal photocoagulation (PRP) to the right eye in the same session. A comprehensive retinal exam is documented and the treatment is separately noted.
Bill:
- 92014--25 (Comprehensive ophthalmological exam, established — modifier -25 because a procedure is also performed the same day)
- 67228--RT (PRP laser, right eye — primary treatment for NVD)
- 92235 (Fluorescein angiography — if performed and separately documented)
- E10.3591 (T1DM with active PDR without macular edema, right eye — primary indication)
- Z79.4 (Long-term use of insulin)
📝 Modifier -25 Tip: When a comprehensive ophthalmological exam (92014) is performed on the same day as a surgical procedure (67228), modifier -25 is placed on the exam code (not the surgical code) to indicate the exam is a separately identifiable evaluation and management service. Documentation must clearly show the exam was distinct from and medically necessary beyond the pre-operative evaluation for the procedure.
Example 2 - New Patient with Vitreous Hemorrhage Complicating PDR
A 28-year-old new patient with poorly controlled T1DM is referred urgently for sudden painless vision loss right eye. The retina specialist performs a comprehensive examination and B-scan ultrasound (due to media opacity). Vitreous hemorrhage is confirmed obscuring the posterior pole of the right eye. The underlying retina appears intact on ultrasound but PDR is documented as the presumed etiology based on clinical context and history.
Bill:
- 92004 (Comprehensive ophthalmological exam, new patient)
- 76512 (B-scan ophthalmic ultrasound)
- E10.3591 (T1DM with PDR without macular edema, right eye — PDR as underlying etiology)
- H43.11 (Vitreous hemorrhage, right eye — separately reportable complication)
- Z79.4 (Long-term use of insulin)
📝 Note: H43.11 is separately coded alongside E10.3591 because vitreous hemorrhage is a distinct complication that requires additional coding per tabular instruction — it is not captured within the PDR code itself.
Example 3 - Same-Day Intravitreal Injection + OCT Monitoring
An established T1DM patient with active PDR right eye returns for follow-up. OCT shows no macular edema confirmed. The retina specialist performs an intravitreal anti-VEGF injection into the right eye to treat the neovascularization, and reviews OCT imaging. The encounter is documented as a moderate complexity established visit.
Bill:
- 99214--25 (Office visit, established, moderate complexity — modifier -25 for same-day procedure)
- 67028--RT (Intravitreal injection, right eye — anti-VEGF for NVD/NVE)
- 92134 (OCT of retina — separately documented diagnostic imaging)
- E10.3591 (T1DM with PDR without macular edema, right eye)
- Z79.4 (Long-term use of insulin)
⚠️ NCCI Bundling Note: Verify that 92134 (OCT) is not bundled with 67028 (intravitreal injection) under NCCI edits in your payer’s system. Medicare allows separate billing of diagnostic imaging when documented as a distinct and separately medically necessary service, but some commercial payers may bundle these. Modifier -59 on the OCT may be required if a column II NCCI edit applies.
Example 4 - Inpatient Secondary Diagnosis (DKA Admission)
A 22-year-old T1DM patient is admitted for diabetic ketoacidosis without coma. The attending physician’s H&P and problem list note pre-existing PDR right eye (active, without macular edema), confirmed in prior ophthalmology records.
Principal Diagnosis:
- E10.10 (Type 1 diabetes mellitus with ketoacidosis without coma)
Secondary Diagnosis:
POA Indicator: Y (Yes) — PDR was pre-existing prior to this admission MS-DRG Impact: E10.3591 may qualify as a CC, potentially elevating the DRG from 639 (no CC/MCC) to 638 (with CC), depending on CMS MS-DRG V43.0 CC designation
📝 Inpatient Documentation Tip: The ophthalmology complication must be actively addressed, evaluated, or monitored during the inpatient stay — or present and identified in the attending’s documentation — to be legitimately coded as a secondary diagnosis per UHDDS guidelines. A code on the problem list alone is not sufficient; there must be some clinical management relevance noted in the record.
Example 5 - PDR Progresses to Stable After PRP — Code Change Required
The same patient from Example 1 returns 3 months after completing PRP. FA now shows complete regression of NVD. The retina specialist documents “Type 1 DM with stable PDR right eye, post-PRP” in the assessment.
Bill (this encounter):
- 92014 (Comprehensive ophthalmological exam, established)
- 92235 (FA — separately documented for treatment response confirmation)
- E10.3551 ← Code CHANGES from E10.3591 to E10.3551 (T1DM with stable PDR, right eye)
- Z79.4 (Long-term use of insulin)
⚠️ Do NOT continue coding E10.3591 once the provider explicitly documents the PDR as stable, regressed, or inactive post-treatment. Use E10.3551 at that point. Continuing to code active PDR when the physician documents stability is an overcoding/upcoding risk.
Example 6 - Bilateral PDR, Different Stages Each Eye
A 30-year-old T1DM patient presents with active PDR right eye (without DME) and severe NPDR left eye (without DME). Both eyes are examined and documented separately.
Bill:
- 92014--25 (Comprehensive exam, established)
- 92134 (OCT, bilateral)
- 67228--RT (PRP, right eye only — left eye not yet at PRP threshold)
- E10.3591 (T1DM with PDR without macular edema, right eye — primary diagnosis for procedure)
- E10.3492 (T1DM with severe NPDR without macular edema, left eye — secondary, separately coded)
- Z79.4 (Long-term use of insulin)
📌 Bilateral Staging Coding Rule: When two eyes have different severity levels of retinopathy, assign the most specific code per eye — one code for each eye using the appropriate laterality character. Do not combine into a bilateral code when staging differs. Each eye must be separately reflected.
📎 Documentation Requirements
For E10.3591 to be correctly reported and defensible on audit, the medical record should include all of the following:
- Explicit Type 1 DM diagnosis — documented by treating provider; “brittle,” “IDDM,” “juvenile-onset,” “insulin-dependent” are all acceptable qualifying terms
- PDR diagnosis stated explicitly — “proliferative diabetic retinopathy” or “PDR” or “neovascularization of the disc/NVD” or “neovascularization elsewhere/NVE” — generic “advanced retinopathy” is insufficient
- Laterality — “right eye” must be documented; avoid “unspecified” when clinical documentation supports specific laterality
- Absence of macular edema — provider must document “no macular edema,” “no DME,” or equivalent; if DME is present, E10.3511 is required instead
- Activity status — “active PDR” vs. “stable PDR” determines E10.3591 vs. E10.3551 — physicians must use specific language
- Causal linkage — retinopathy must be attributed to diabetes (“diabetic retinopathy” / “retinopathy due to T1DM” / “diabetic eye disease”); do not assume causality if not documented
- Insulin use — document to support Z79.4
- Supporting imaging — OCT, FA, fundus photos in the chart strongly support the clinical diagnosis and severity level claimed
⚠️ Audit Red Flag: A chart that documents “diabetic retinopathy” without specifying severity, laterality, or macular edema status — and codes E10.3591 — is a high audit risk. The code is extremely specific; the documentation must match. Query providers for clarification rather than defaulting to a specific code based on clinical inference alone.
🔁 Payer and Compliance Considerations
- Medicare Advantage (MA): E10.3591 maps to HCC 38 under V28 (fully active 2026); must be coded and submitted at least once per calendar year on an MA-eligible encounter to receive risk adjustment credit; do not rely on hospital claims — physician face-to-face encounters drive MA risk adjustment
- MIPS Quality Reporting: E10.3591 supports MIPS Measure #117 (Diabetes: Eye Exam) when paired with a qualifying exam CPT code (92004, 92014, 99202-99215); this is a high-priority measure for ophthalmology, optometry, and endocrinology MIPS performance
- PRP Global Period (67228): 10-day global period — do not bill additional office visits within the global unless a new or unrelated problem is being addressed; document clearly if a separate E/M within 10 days is for a different condition
- Anti-VEGF Frequency Monitoring: Intravitreal injections (67028) have no set MUE frequency limit per CMS; however, payers may impose prior authorization requirements for extended anti-VEGF courses — check payer-specific policies and maintain robust medical necessity documentation
- LCD Guidance: CMS LCD for Panretinal Photocoagulation (A56594) explicitly lists E10.3591 (and predecessor codes) as covered diagnoses for 67228 — verify current LCD groupings via your MAC jurisdiction
- ICD-10-CM Annual Updates: October 1 each year — verify E10.3591 has not been revised or expanded; the E10.35 family has been relatively stable since FY2017 but always confirm against CMS ICD-10-CM tabular addenda
Sources: AAPC Codify E10.3591 · FindACode E10.3591 · GenHealth.ai E10.3591 · Unbound Medicine ICD-10-CM · CMS ICD-10-CM/PCS MS-DRG V43.0 Definitions Manual FY2026 · CMS MS-DRG V37.2 Definitions Manual · CMS Article A56594 Panretinal Photocoagulation · CMS Home Health LCD A56674 ICD-10 Groups · RevEHR Appendix G DR Measure ICD Codes · CMS HCC V28 2026 Software/ICD-10 Mappings · Wolters Kluwer V28 RAF Impact Analysis · Raapid Inc CMS-HCC V28 Full Conditions List · AAPC Ophthalmology Coding Alert PRP/PDR · Eyes on Eyecare OD DR Billing Guide · Retinal Physician Coding Q&A 2015 · Retinal Physician Retina Surgery Coding 2025 · PMC NCBI ICD-10 Coding for DR (2017) · AMA CPT 2025-2026