🧬 ICD-10 CM H35.031 — Hypertensive Retinopathy, Right Eye
Billable Code Confirmed
ICD-10 CM H35.031 is a fully specified 6-character code: category H35 (other retinal disorders) → subcategory H35.0 (background retinopathy/vascular changes) → H35.03 (hypertensive retinopathy) → 6th character 1 for right eye. No further specificity is required for reimbursement.
Non-Billable Parent Codes
H35 — category header, lacks both subtype and laterality, not billable.
H35.0 — subcategory header, still missing the vascular-change subtype, not billable.
H35.03 — specifies hypertensive retinopathy but omits laterality; payers reject this 5-character stem and require H35.031/.032/.033/.039.
Clinical Context
The clinical distinction driving code selection is etiology — hypertensive vascular damage versus diabetic, exudative, or neovascular processes — combined with laterality. Documentation must tie the retinal finding to chronic or malignant hypertension rather than leave it as an isolated fundoscopic finding.
Code Classification
ICD-10 CM H35.031 is a diagnosis code (ICD-10-CM), not a procedure code. It documents end-organ retinal damage from hypertension and is almost always reported in conjunction with a hypertension code per the mandatory “code also” instructional note.
🔍 Code Description
Hypertensive retinopathy describes structural retinal vascular changes caused by chronic or malignant systemic hypertension — arteriolar narrowing, arteriovenous nicking, flame-shaped hemorrhages, cotton-wool spots, and in severe cases, optic disc edema. H35.031 captures this finding specifically in the right eye and is distinguished from H35.021 (exudative retinopathy) and H35.011 (nonspecific retinal vascular change) by its documented hypertensive etiology.
Because hypertensive retinopathy is a manifestation of systemic disease rather than a primary ocular condition, ICD-10-CM instructs coders to report the underlying hypertension code alongside H35.031 — this is a “code also” requirement under the H35.0- subcategory, not a discretionary Excludes2 pairing. Grading severity (Keith-Wagener-Barker Grade I-IV) is a clinical detail that does not change code selection but does support medical necessity for diagnostic imaging like fluorescein angiography or fundus photography.
🌳 Code Tree / Hierarchy
H35 Other retinal disorders ❌ Non-billable
│
├── H35.00 Unspecified background retinopathy ✅ Billable
├── H35.01 Changes in retinal vascular appearance ❌ Non-billable (parent)
│ │
│ ├── H35.011 Changes in retinal vascular appearance, right eye ✅ Billable
│ └── H35.012 Changes in retinal vascular appearance, left eye ✅ Billable
│
├── H35.02 Exudative retinopathy ❌ Non-billable (parent)
│ │
│ ├── H35.021 Exudative retinopathy, right eye ✅ Billable
│ └── H35.022 Exudative retinopathy, left eye ✅ Billable
│
├── H35.03 Hypertensive retinopathy ❌ Non-billable (parent)
│ │
│ ├── H35.031 Hypertensive retinopathy, right eye ◀ THIS CODE ✅ Billable
│ ├── H35.032 Hypertensive retinopathy, left eye ✅ Billable
│ ├── H35.033 Hypertensive retinopathy, bilateral ✅ Billable
│ └── H35.039 Hypertensive retinopathy, unspecified eye ✅ Billable
│
└── H35.04 Retinal micro-aneurysms, unspecified ✅ Billable (parent, further laterality below)Mandatory Hypertension Pairing
ICD-10 CM H35.031 should almost never stand alone on a claim — the “code also” instruction under H35.0- requires an associated hypertension code (I10 or a combination code from I11-I13). Missing this pairing is a common denial trigger, particularly for payers auditing diagnostic imaging medical necessity.
Tip
If documentation describes both hypertensive changes and a distinct diabetic component, do not default to H35.031 alone — verify whether a diabetic combination code from the E08-E13 series better captures a mixed-etiology picture, and code both if clinically distinct.
✅ Includes
- Arteriolar narrowing and AV nicking documented as hypertension-related, right eye.
- Flame-shaped retinal hemorrhages and cotton-wool spots attributed to systemic hypertension, right eye.
- Grade I-IV hypertensive retinopathy findings per Keith-Wagener-Barker classification, right eye, when hypertensive etiology is explicitly documented.
❌ Excludes
Excludes 1
ICD-10 CM H35.051 — Retinal neovascularization, right eye, unspecified — mutually exclusive when new vessel growth rather than hypertensive vascular narrowing/hemorrhage is the dominant documented process.
Danger
The most common Excludes1 error is defaulting to H35.031 for any retinal vascular finding in a hypertensive patient without confirming the ophthalmologist actually attributed the finding to hypertension — retinal changes in a hypertensive patient are not automatically hypertensive retinopathy; verify the documented causal link.
Excludes 2
- Hypertensive diseases, e.g. I10 — this is a mandatory “code also” pairing, not an optional combination; report the hypertension code alongside H35.031 whenever the retinal finding is attributed to hypertension.
- Diabetic retinal disorders, e.g. E11.3511 — both may be reported when a patient has clinically distinct hypertensive and diabetic retinal changes documented separately, rather than a single overlapping diabetic-hypertensive picture.
📋 Clinical Overview
Hypertensive vs. Diabetic vs. Nonspecific Vascular Retinal Change
Distinguishing hypertensive retinopathy from diabetic and nonspecific retinal vascular codes hinges entirely on documented etiology, since the fundoscopic findings can overlap significantly between hypertensive and diabetic microvascular disease.
| Feature | H35.031 | Related E11.3511 | Related H35.011 |
|---|---|---|---|
| Primary etiology | Chronic/malignant systemic hypertension | Diabetes-driven microvascular damage | Nonspecific/undetermined etiology |
| Typical findings | AV nicking, flame hemorrhages, cotton-wool spots | Microaneurysms, dot-blot hemorrhages, exudates | Vascular tortuosity without clear cause documented |
| Mandatory pairing | Code also hypertension (I10-I15) | Diabetic combination code stands alone | None required |
Important
CDI should query when a note documents “retinal vascular changes” in a hypertensive patient without explicitly linking the finding to hypertension — this determines whether H35.031 or the less specific H35.011 is appropriate, and payers scrutinize this distinction during medical necessity review for retinal imaging.
Manifestations & Symptom Burden
- Often asymptomatic in early/mild grades, detected incidentally on dilated fundus exam.
- Blurred vision when hemorrhage or cotton-wool spots involve the macular region.
- Headache and visual disturbance in malignant hypertension with severe (Grade III-IV) retinopathy.
- Optic disc edema in the most severe malignant hypertensive presentations (code separately if documented).
Tip
Optic disc swelling from malignant hypertension is coded separately (H47.10- series) when explicitly documented — don’t assume it’s bundled into H35.031.
💰 HCC Risk Adjustment
| Model | HCC Mapping | RAF Impact |
|---|---|---|
| CMS-HCC v28 (2026) | Not Mapped | None |
| RxHCC | Not Mapped | None |
ICD-10 CM H35.031 itself carries no RAF weight. The clinically and financially significant capture is the underlying hypertension diagnosis — confirm I10, or a hypertensive heart/chronic kidney disease combination code (I11-I13 series) if applicable, is present and current on the claim, since that code family carries the actual risk-adjustment value tied to this retinal finding.
🏥 MS-DRG Assignment
| DRG | Description | CC/MCC Requirement |
|---|---|---|
| 124 | Other Disorders of the Eye with MCC | Requires qualifying MCC elsewhere on claim |
| 125 | Other Disorders of the Eye without MCC | Default when no MCC present |
ICD-10 CM H35.031 groups to MDC 02 (Eye) and, as with most H35 codes, is uncommon as a principal diagnosis — it typically appears as a secondary finding during an admission for hypertensive crisis, cardiovascular event, or unrelated inpatient stay. No national NCD governs this diagnosis code directly; LCD medical necessity criteria attach to any associated diagnostic testing (fluorescein angiography, extended ophthalmoscopy, fundus photography) rather than to H35.031 in isolation — check your MAC’s specific LCD for covered ICD-10-CM pairings before billing the diagnostic procedure.
🔗 Related ICD-10-CM Codes
Same H35.03 family (laterality variants):
- H35.032 — Hypertensive retinopathy, left eye
- H35.033 — Hypertensive retinopathy, bilateral
- H35.039 — Hypertensive retinopathy, unspecified eye
Etiology/hypertension pairing and differential codes:
- I10 — Essential (primary) hypertension — mandatory “code also” pairing when no heart/kidney involvement is documented
- H35.011 — Changes in retinal vascular appearance, right eye, unspecified — use when etiology is not clearly hypertensive
- E11.3511 — Type 2 diabetes with proliferative diabetic retinopathy with macular edema, right eye
- H47.10 — Unspecified disorder of optic disc, bilateral — code separately if malignant hypertension causes documented disc edema
🛠️ Commonly Associated CPT Codes
- 92250 — Fundus photography with interpretation and report; commonly performed to document hypertensive vascular changes for baseline and follow-up comparison.
- 92225 — Ophthalmoscopy, extended, with retinal drawing, initial; used to detail hypertensive fundus findings when photography alone is insufficient.
- 92226 — Ophthalmoscopy, extended, subsequent; for follow-up documentation of progression or stability.
- 92235 — Fluorescein angiography; reserved for cases where vascular leakage or occlusion needs to be characterized beyond standard fundus exam.
- 99213 or 99214 — Established patient E/M visit; frequently billed alongside diagnostic imaging when hypertensive retinopathy is monitored as part of a broader hypertension management visit.
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -RT | Right Side | Append to CPT codes 92250, 92225/92226, or 92235 when the procedure is performed unilaterally on the right eye only, consistent with the H35.031 laterality. |
| -LT | Left Side | Not applicable to a right-eye-only H35.031 diagnosis unless a distinct, separately documented left-eye finding is also being billed. |
| -50 | Bilateral | Apply only if the same diagnostic procedure is performed on both eyes in the same session and H35.033 (bilateral) is the supporting diagnosis instead. |
| -25 | Significant E/M | Append to the E/M code when a significant, separately identifiable evaluation is performed on the same date as fundus photography or extended ophthalmoscopy. |
| -24 | Unrelated E/M | Use if an E/M service unrelated to the hypertensive retinopathy is billed during a global period from an unrelated prior procedure. |
| -59 | Distinct Service | Append to fluorescein angiography (92235) when billed alongside fundus photography (92250) on the same date, with documentation supporting each test provided distinct diagnostic value. |
| -52 | Reduced Services | Apply if extended ophthalmoscopy or angiography is documented as partially completed due to patient tolerance or technical limitation. |
NCCI Bundling Considerations
Fundus photography (92250) and extended ophthalmoscopy (92225/92226) performed on the same date for the same eye are typically bundled by NCCI edits and require modifier -59 with clear documentation that each test independently contributed new diagnostic information, not routine duplication.
🔬 ICD-10-PCS Crosswalk
- 08533ZZ — Destruction of Right Eye, Percutaneous Approach — not typically applicable to H35.031 alone, since hypertensive retinopathy is medically managed rather than surgically treated; include only if a distinct procedural intervention (e.g., laser for a coexisting complication) is separately documented.
- No routine PCS crosswalk applies — hypertensive retinopathy is a medical diagnosis managed through systemic blood pressure control rather than an ophthalmic procedure; if the inpatient stay involves no eye-specific procedure, no ICD-10-PCS code is generated from this diagnosis alone.
💊 Coding Scenarios and Examples
Example 1
Clinical Scenario:
A patient admitted for hypertensive emergency undergoes dilated fundus exam revealing right-eye AV nicking, flame hemorrhages, and cotton-wool spots, documented by ophthalmology consult as hypertensive retinopathy. Fundus photography is performed to document baseline severity.
| Field | Code | Rationale |
|---|---|---|
| CPT | 92250--RT | Fundus photography performed and documented for the right eye only, matching the unilateral finding. |
| PDx | I10 | Hypertensive emergency is the reason for admission and principal diagnosis. |
Tip
ICD-10 CM H35.031 is reported as a secondary diagnosis supporting the ophthalmology consult and imaging; per the H35.0- “code also” instruction, both I10 and H35.031 must appear on the claim — omitting either is a sequencing error.
CDI note: confirm the ophthalmology consult explicitly attributes the retinal findings to hypertension rather than leaving etiology ambiguous.
Example 2
Clinical Scenario:
An outpatient hypertension follow-up visit includes extended ophthalmoscopy to assess progression of known right-eye hypertensive retinopathy, along with a significant, separately documented E/M service addressing medication titration.
| Field | Code | Rationale |
|---|---|---|
| CPT | 99214--25 | Significant, separately identifiable E/M service for hypertension management performed same day as the eye exam. |
| CPT 2 | 92225--RT | Initial extended ophthalmoscopy with retinal drawing, right eye. |
| PDx | H35.031 | Hypertensive retinopathy, right eye, is the primary reason for the ophthalmic portion of the visit. |
Tip
Example 3
Clinical Scenario:
A follow-up visit six months later shows stable right-eye hypertensive retinopathy findings; fluorescein angiography is ordered because a new area of vascular leakage is suspected on routine exam.
| Field | Code | Rationale |
|---|---|---|
| CPT | 92235--RT | Fluorescein angiography performed for the right eye to characterize new suspected vascular leakage. |
| PDx | H35.031 | Hypertensive retinopathy, right eye, remains the primary ocular diagnosis driving the diagnostic workup. |
Tip
Sequence I10 (or applicable hypertension combination code) as a required additional diagnosis. CDI note: document the specific new clinical finding prompting angiography to support medical necessity, since routine/stable disease monitoring alone may not meet payer coverage criteria for this test.
⚠️ Coding Pitfalls and Tips
- Pitfall 1: Reporting H35.031 without the mandatory hypertension code (I10 or I11-I13 series); Tips: Always cross-check the H35.0- “code also” instructional note before finalizing the claim — this pairing is required, not optional.
- Pitfall 2: Defaulting to H35.039 (unspecified eye) when laterality is documented elsewhere in the chart; Tips: Review the full ophthalmology consult and imaging report before finalizing laterality.
- Pitfall 3: Assigning H35.031 for any retinal vascular finding in a hypertensive patient without confirmed causal documentation; Tips: Query the provider if the fundoscopic note doesn’t explicitly link findings to hypertension.
- Pitfall 4: Billing fundus photography and extended ophthalmoscopy together without modifier -59 and supporting documentation; Tips: Confirm each test provided distinct diagnostic value before unbundling.
- Pitfall 5: Confusing hypertensive retinopathy with diabetic retinopathy in a patient with both conditions; Tips: Verify the ophthalmologist’s documented etiology for each distinct finding rather than assuming overlap.
- Pitfall 6: Omitting a separate optic disc edema code (H47.10-) in malignant hypertension cases where disc swelling is documented; Tips: Confirm whether disc involvement is present and code it in addition to H35.031, not in place of it.
📚 Sources
1. ICD10Data.com. *2026 ICD-10-CM Diagnosis Code H35.031 — Hypertensive retinopathy, right eye.* Centers for Medicare & Medicaid Services / National Center for Health Statistics; 2026. 2. ICD10Data.com. *2026 ICD-10-CM Diagnosis Code H35.03 — Hypertensive retinopathy.* CMS/NCHS; 2026. 3. AAPC/Codify. *ICD-10 Code for Hypertensive Retinopathy, Right Eye — H35.031.* AAPC; 2026. 4. Centene/Envolve Vision Benefits. *Clinical Policy: Fluorescein Angiography, Fundus Photography, Extended Ophthalmoscopy.* 2026 payer medical necessity policies. 5. CMS.gov. *MS-DRG v43.0 Definitions Manual — MDC 02, DRG 124/125.* Centers for Medicare & Medicaid Services; 2026.Sources listed above correspond to superscript citations throughout this note. Verify all Medicare payment figures against your current CMS PFS Lookup tool and applicable MAC LCD prior to claim submission. Please use the latest AAPC/AHIMA Coding Books to verify each code within this note.