Crystal's MCW Coder Hub🧬 ICD-10-CM H34.232 - Retinal Artery Branch Occlusion, Left Eye
📋 Code Identity
| Field | Detail |
|---|---|
| ICD-10-CM Code | H34.232 |
| Full Descriptor | Retinal Artery Branch Occlusion, Left Eye |
| Abbreviation | BRAO - Left Eye |
| Code Type | ICD-10-CM Diagnosis (Billable) |
| Effective Date | FY 2026 (October 1, 2025 - September 30, 2026) |
| Chapter | 7 - Diseases of the Eye and Adnexa (H00-H59) |
| Block | H30-H36 - Disorders of Choroid and Retina |
| Category | H34 - Retinal Vascular Occlusions |
| Subcategory | H34.23 - Retinal Artery Branch Occlusion |
| Laterality Character | 6th character = 2 (Left Eye) |
| Inpatient CC/MCC Status | ✅ CC - Complication or Comorbidity |
| Chronic Condition Indicator | Chronic |
⚠️ Laterality Reminder: ICD-10-CM H34.232 is left eye only. If documentation clearly identifies the right eye, use H34.231. If bilateral involvement is documented, use H34.233. Default to H34.239 only when eye laterality is truly undocumented after a provider query attempt. Never assign unspecified laterality when the record supports specificity.
🔬 Clinical Description
A branch retinal artery occlusion (BRAO) of the left eye is the acute, complete or near-complete obstruction of one of the secondary or tertiary arterial branches arising from the central retinal artery (CRA) after it enters the left eye through the optic disc. This results in a sectoral ischemic infarct of the inner retinal layers supplied by the occluded branch, producing a corresponding sectoral visual field defect — most commonly an altitudinal or quadrantic scotoma — that the patient experiences as a sudden, painless loss of part of their visual field.
BRAO is anatomically distinct from:
- Central Retinal Artery Occlusion (CRAO) H34.12 — affects the entire CRA trunk, causing total or near-total visual loss in the affected eye
- Partial Retinal Artery Occlusion (PRAO) H34.212 — Hollenhorst plaque or microembolism with incomplete obstruction and preserved distal flow
- Transient Retinal Artery Occlusion H34.02 — temporary embolic event with full visual recovery and no persistent ischemic change on exam (amaurosis fugax equivalent at the structural level)
Pathophysiology
The vast majority of BRAOs are caused by embolic occlusion at a point of arterial bifurcation, where vessel caliber narrows and emboli are most likely to lodge. The three dominant embolus types are:
- Cholesterol emboli (Hollenhorst plaques) — Bright, refractile, yellow-orange crystals; most common type; nearly always from an ipsilateral internal carotid artery atherosclerotic plaque; may persist at the bifurcation site for months to years
- Calcific emboli — White, non-refractile, chalky appearance; typically originate from calcified aortic or mitral valves in the setting of cardiac valvular disease; tend to cause larger occlusions and greater ischemia
- Fibrin-platelet emboli — Dull, grayish-white, elongated plugs; arise from intracardiac thrombus in the setting of atrial fibrillation, mural thrombus post-MI, or large vessel thrombosis; often transient; most dangerous from a stroke-risk standpoint
Less common, non-embolic causes include:
- Giant cell arteritis (GCA) — A true ophthalmic emergency in patients >50; do not miss; requires emergent ESR, CRP, and temporal artery biopsy
- Vasospasm — Young patients, migraine-associated BRAO
- Hypercoagulable states — Antiphospholipid antibody syndrome, Factor V Leiden, protein C/S deficiency; more common in patients <50
- Inflammatory/infectious vasculitis — sarcoidosis, lupus, syphilis
Acute Retinal Changes
Within minutes of arterial occlusion, the inner retinal layers in the ischemic sector develop cytotoxic edema as neurons are deprived of oxygen and ATP. On fundus exam, this appears as grayish-white opacification of the affected retinal sector, following the distribution of the occluded branch. A Hollenhorst plaque may be visible at the site of the bifurcation. The fovea may be spared if the occlusion is in the peripheral distribution, preserving central visual acuity — which is why many BRAO patients retain relatively good Snellen acuity despite significant field loss.
Imaging Correlates
| Study | Acute Findings | Chronic Findings |
|---|---|---|
| Fundus Photography | Sectoral retinal whitening, visible embolus, flame hemorrhages along affected vessel | Inner retinal thinning, vessel attenuation, resolved pallor |
| Fluorescein Angiography (FA) | Delayed/absent branch arterial filling, hypofluorescence of ischemic zone, AV transit delay | Vessel wall staining, possible telangiectasia, NV leakage if present |
| OCT Posterior Segment | Inner retinal hyperreflectivity and thickening (ischemic edema), disruption of inner layers | GCL-IPL thinning/atrophy in affected sector — “retinal thinning scar” |
| OCT-A | Non-perfusion/capillary dropout in superficial ± deep capillary plexus in ischemic zone | Permanent flow void, collateral vessel formation may be visible |
🧠 BRAO as a Stroke Equivalent (AAO 2025): The American Academy of Ophthalmology and American Heart Association classify BRAO as a cerebrovascular event requiring urgent systemic evaluation, parallel to a TIA. Studies consistently show a 10-15% risk of stroke within 3 months following a retinal artery occlusion. Emergent workup including carotid Doppler ultrasonography, transthoracic or transesophageal echocardiogram, cardiac rhythm monitoring (Holter or prolonged telemetry), and fasting metabolic/lipid labs is standard of care. In patients >50, same-day serum ESR and CRP are mandatory to rule out GCA.
🌳 Code Tree
H34 - Retinal Vascular Occlusions
│
├── H34.0 - Transient Retinal Artery Occlusion
│ ├── H34.00 - Unspecified eye
│ ├── H34.01 - Right eye
│ ├── H34.02 - Left eye
│ └── H34.03 - Bilateral
│
├── H34.1 - Central Retinal Artery Occlusion
│ ├── H34.10 - Unspecified eye
│ ├── H34.11 - Right eye
│ ├── H34.12 - Left eye
│ └── H34.13 - Bilateral
│
├── H34.2 - Other Retinal Artery Occlusions
│ │
│ ├── H34.21 - Partial Retinal Artery Occlusion (Hollenhorst Plaque / Microembolism)
│ │ ├── H34.211 - Right eye
│ │ ├── H34.212 - Left eye
│ │ ├── H34.213 - Bilateral
│ │ └── H34.219 - Unspecified eye
│ │
│ └── H34.23 - Retinal Artery Branch Occlusion
│ ├── H34.231 - Right eye
│ ├── H34.232 - Left eye ◀ THIS CODE
│ ├── H34.233 - Bilateral
│ └── H34.239 - Unspecified eye
│
└── H34.8 - Other Retinal Vascular Occlusions
│
├── H34.81 - Central Retinal Vein Occlusion
│ ├── H34.8110 - Right eye, with macular edema
│ ├── H34.8111 - Right eye, with retinal neovascularization
│ ├── H34.8112 - Right eye, stable
│ ├── H34.8120 - Left eye, with macular edema
│ ├── H34.8121 - Left eye, with retinal neovascularization
│ └── H34.8122 - Left eye, stable
│
├── H34.82 - Venous Engorgement
│ ├── H34.821 - Right eye
│ ├── H34.822 - Left eye
│ └── H34.823 - Bilateral
│
└── H34.83 - Tributary (Branch) Retinal Vein Occlusion
├── H34.8320 - Left eye, with macular edema
├── H34.8321 - Left eye, with retinal neovascularization
└── H34.8322 - Left eye, stable
🔍 Artery vs. Vein — Don’t Mix Them Up:
- H34.232 = Branch artery occlusion, left eye (this code — embolic, ischemic infarct)
- H34.8320 = Branch vein (tributary) occlusion, left eye with macular edema — completely different pathophysiology (venous stasis, macular edema, treated with anti-VEGF)
✅ Includes
The following clinical presentations fall under the H34.23x subcategory and are captured by H34.232:
- Branch retinal artery occlusion (BRAO), left eye — occlusion of any secondary or tertiary branch of the central retinal artery distal to the optic disc, affecting the left eye
- Embolic BRAO — cholesterol (Hollenhorst plaque), calcific, or fibrin-platelet emboli lodging at a branch arterial bifurcation
- Non-embolic BRAO — vasospasm, vasculitis (GCA, lupus, sarcoidosis), hypercoagulability, inflammatory thrombosis in the left eye
- Acute ischemic retinal edema (inner retinal whitening) in a sectoral distribution in the left eye
- Sectoral or quadrantic visual field defect secondary to left eye inner retinal ischemia from branch arterial occlusion
🚫 Excludes
Excludes 1 (Mutually exclusive — cannot be coded simultaneously with H34.232)
| Excluded Code | Description | Clinical Rationale |
|---|---|---|
| G45.3 | Amaurosis fugax | Amaurosis fugax represents a transient embolic visual loss with complete recovery and no structural retinal change — it is a TIA-equivalent coded under cerebrovascular disease. H34.232 represents a permanent structural ischemic event with visible funduscopic and imaging findings. These two codes describe different entities and must not be assigned to the same episode of care. |
💡 Clinical Nuance: A patient may present describing a prior episode of amaurosis fugax (which could be coded as history if previously documented) and now present with a new, confirmed BRAO on exam. In that setting, H34.232 is appropriate for the current confirmed event. The history of amaurosis fugax would be a past medical history item and not dual-coded on the same encounter.
🏥 HCC (Hierarchical Condition Category)
| Field | Detail |
|---|---|
| HCC Mapped? | ❌ No — H34.232 does not map to any category under the CMS-HCC v28 risk adjustment model |
| RAF Score Contribution | None — this code alone does not increase Medicare Advantage capitation payment |
| ESRD/Dialysis Risk Adjustment | Not applicable |
| Pediatric Model | Not applicable |
💰 Risk Adjustment Strategy — Code the Root Cause: H34.232 itself carries no RAF weight, but the underlying etiologies are rich with HCC-mapped diagnoses. Ensuring these are documented and coded is where the risk adjustment value lives:
| Code | Description | HCC Category | RAF Weight (approx.) |
|---|---|---|---|
| I48.0 | Paroxysmal atrial fibrillation | HCC 96 | ~0.323 |
| I48.11 | Longstanding persistent atrial fibrillation | HCC 96 | ~0.323 |
| I48.91 | Unspecified atrial fibrillation | HCC 96 | ~0.323 |
| I65.22 | Occlusion and stenosis of left carotid artery | HCC 108 | ~0.298 |
| E11.9 | Type 2 diabetes mellitus w/o complications | HCC 19 | ~0.105 |
| E11.65 | Type 2 DM with hyperglycemia | HCC 19 | ~0.105 |
| I25.10 | Atherosclerotic heart disease of native coronary artery | HCC 88 | ~0.331 |
| M31.6 | Other giant cell arteritis | HCC 38 | ~0.422 |
| I10 | Essential hypertension | ❌ No HCC | — |
| E78.5 | Hyperlipidemia, unspecified | ❌ No HCC | — |
Caution
⚠️ RAF weight values are approximate and subject to annual CMS updates. Always verify current year model coefficients via the CMS-HCC v28 software.
🏨 MS-DRG (Medicare Severity DRG)
| Field | Detail |
|---|---|
| CC/MCC Status | ✅ CC - Complication or Comorbidity |
| Primary MS-DRG (as PDx) | MS-DRG 124 - Other Disorders of the Eye with MCC |
| Primary MS-DRG (as PDx, no MCC) | MS-DRG 125 - Other Disorders of the Eye without MCC/CC |
| MDC | MDC 02 - Diseases and Disorders of the Eye |
| As Secondary Diagnosis | Acts as a CC, eligible to upgrade the base DRG of the principal diagnosis |
| CMS MS-DRG Version | v42 (FY2026) |
DRG Decision Logic (When H34.232 is the Principal Diagnosis)
PDx: H34.232 → MDC 02 → Base DRG: 125
+ MCC present (e.g., acute stroke I63.x, respiratory failure J96.x)?
→ MS-DRG 124 (higher reimbursement)
+ CC present (e.g., atrial fibrillation I48.91, carotid stenosis I65.22)?
→ Verify grouper logic — some payers upgrade 125 → 124 with CC
→ Confirm in current CMS MS-DRG v42 Definitions Manual
No CC/MCC?
→ MS-DRG 125
🏥 Inpatient Profee / Facility Coding Pearl: When H34.232 appears as a secondary diagnosis on an admission for another principal diagnosis (e.g., admitted for new-onset atrial fibrillation, TIA, or stroke), its CC designation means it may upgrade the DRG of that principal diagnosis. In a complex inpatient record, always sequence correctly and code all comorbidities — the CC/MCC impact on reimbursement is significant.
💊 Associated CPT Codes (Commonly Reported With H34.232)
wRVU values reflect 2025 CMS Medicare Physician Fee Schedule final rule. Non-facility values represent professional services rendered in the office/clinic setting.
| CPT Code | Description | wRVU (Non-Fac) | wRVU (Facility) | Assistant Payable? | Notes |
|---|---|---|---|---|---|
| 92235 | Fluorescein angiography with interpretation and report | 0.92 | 0.92 | No | Gold standard for BRAO confirmation; documents ischemic zone extent |
| 92134 | OCT posterior segment with interpretation and report | 0.00 | 0.00 | No | Work RVU = 0; value in PE RVU; documents inner retinal edema/atrophy |
| 92137 | OCT posterior segment with OCT angiography (OCTA) with interpretation and report | 0.79 | 0.79 | No | New 2025; cannot bill same day as 92134; maps capillary non-perfusion |
| 92240 | Indocyanine-green (ICG) angiography with interpretation and report | 0.92 | 0.92 | No | Less commonly used for BRAO; helpful if combined retinal/choroidal pathology |
| 92242 | Combined fluorescein and ICG angiography with interpretation and report | 1.38 | 1.38 | No | When dual angiography medically necessary |
| 92250 | Fundus photography with interpretation and report | 0.00 | 0.00 | No | Documents embolic plaque location, retinal pallor; work RVU = 0 |
| 92201 | Extended ophthalmoscopy with retinal drawing, with scleral depression | 1.02 | 1.02 | No | Used when peripheral exam/drawings needed |
| 67228 | Treatment of extensive/progressive retinopathy; photocoagulation (one or more sessions) | 3.09 | 3.09 | No | PRP for neovascularization developing from ischemic BRAO |
| 67210 | Destruction of localized lesion of retina; photocoagulation | 3.43 | 3.43 | No | Focal laser to focal NV or microaneurysms secondary to ischemia |
| 99205 | Office/outpatient E/M, new patient, high complexity | 3.50 | 3.50 | No | Appropriate for initial BRAO presentation |
| 99215 | Office/outpatient E/M, established patient, high complexity | 2.85 | 2.85 | No | High complexity justified by systemic risk and complex management |
| 99253 | Inpatient/obs consult, moderate complexity | 3.86 | 3.86 | No | Ophthalmology consult in hospital setting |
| 99254 | Inpatient/obs consult, moderate-high complexity | 5.30 | 5.30 | No | Complex BRAO with multisystem involvement, systemic workup |
⚠️ Key Bundling & NCCI Rules
- 92137 (OCTA) cannot be reported on the same date of service as 92134 (OCT posterior segment without angiography) — they are mutually exclusive per NCCI edits
- 92137 can be reported on the same day as 92235, 92240, or 92242
- 92250 (fundus photography) has a work RVU of 0.00 — the reimbursement value is in the practice expense component; medical necessity must still be documented
- Modifier -25 is required when billing an E/M on the same day as a diagnostic procedure (e.g., 99215 + 92235 on the same visit) — document the E/M separately and clearly
🔧 Applicable Modifiers
| Modifier | Description | Application with H34.232 |
|---|---|---|
| -LT | Left side | Append to laterality-specific CPT ophthalmic procedure codes performed on the left eye |
| -RT | Right side | Use if the fellow right eye is also examined or treated at the same encounter |
| -25 | Significant, separately identifiable E/M on same day as a procedure | Required when E/M + imaging or laser performed same day; E/M must meet complexity threshold independently |
| -59 | Distinct procedural service | Used to bypass NCCI edits when two procedures are legitimately distinct and documentation supports it |
| -26 | Professional component | When physician interprets imaging performed at another facility (e.g., reads FA technically performed elsewhere) |
| -TC | Technical component | When facility bills for equipment/technical service only |
| -50 | Bilateral procedure | For bilateral diagnostic imaging (e.g., bilateral FA 92235) at the same session |
| -GC | Service performed in part by resident | Teaching hospital/academic setting; attending must document supervision |
| -GA | Waiver of liability on file (ABN obtained) | When an ABN has been secured for a potentially non-covered service under Medicare |
📝 Coding Examples
Example 1 — New Patient, Acute BRAO, Outpatient Retina Clinic
A 67-year-old female, new patient, presents urgently to a retina specialist with sudden onset of a dense inferior visual field defect in the left eye noted upon waking this morning. PMH: hypertension, hyperlipidemia, paroxysmal atrial fibrillation on anticoagulation. On dilated exam: bright, refractile, yellow-orange plaque visible at the inferotemporal arterial bifurcation of the left eye with a sector of retinal whitening/pallor along the inferior arcade. Fluorescein angiography confirms delayed filling of the inferotemporal branch with hypofluorescence of the ischemic zone. OCT-A performed and interpreted the same day demonstrates superficial and deep capillary plexus dropout in the inferior sector. Patient referred to neurology/ED for urgent stroke workup.
Diagnosis Codes:
- H34.232 - Retinal artery branch occlusion, left eye (principal)
- I48.0 - Paroxysmal atrial fibrillation (cardioembolic source)
- I10 - Essential hypertension
- E78.5 - Hyperlipidemia, unspecified
CPT Codes:
- 99205 - -25 - Office/outpatient E/M, new patient, high complexity
- 92235 - -LT - Fluorescein angiography, left eye
- 92137 - -LT - OCT with OCT angiography, left eye (do NOT also bill 92134 this date)
Example 2 — Emergency Department Ophthalmology Consult (Profee)
A 71-year-old male presents to the emergency department with acute painless loss of a superior-temporal visual field in the left eye. Ophthalmology is consulted in the ED. Dilated fundus exam by the retina fellow (supervising attending documents oversight) confirms a branch retinal artery occlusion of the superior temporal branch, left eye, with a visible Hollenhorst plaque. Fundus photos obtained. Patient admitted for TIA/stroke protocol evaluation. Carotid Doppler and echocardiogram ordered.
Diagnosis Codes:
- H34.232 - Retinal artery branch occlusion, left eye
- I10 - Essential hypertension
- I65.22 - Occlusion and stenosis of left carotid artery (if confirmed on carotid Doppler during same admission)
CPT Codes (Profee):
- 99254 - -GC - Inpatient consult, moderate-high complexity (resident with attending supervision)
- 92250 - -LT - Fundus photography with interpretation, left eye
Example 3 — Established Patient Follow-Up, Chronic BRAO with Neovascularization
An established 69-year-old patient returns 10 weeks following confirmed BRAO of the left eye. OCT posterior segment demonstrates progressive inner retinal thinning (GCL-IPL complex atrophy) in the inferior sector of the left eye. New retinal neovascularization (NV) is noted along the inferior arcade on fundus exam — a late ischemic complication. Fluorescein angiography confirms NV with leakage. PRP laser is performed in-office to ablate the ischemic retina driving the NV.
Diagnosis Codes:
- H34.232 - Retinal artery branch occlusion, left eye (ongoing, driving NV)
- H35.022 - Neovascularization of retina, left eye (complication of chronic ischemia)
CPT Codes:
- 99215 - -25 - E/M, established patient, high complexity
- 92235 - -LT - Fluorescein angiography with interpretation, left eye
- 67228 - -LT - Photocoagulation, extensive/progressive retinopathy, left eye
Example 4 — Inpatient Facility Coding, DRG Scenarios
Scenario A — H34.232 as Principal Diagnosis, No CC/MCC:
Scenario B — H34.232 as PDx + CC (atrial fibrillation):
Scenario C — H34.232 as Secondary Dx on Stroke Admission:
- PDx: I63.512 - Cerebral infarction due to unspecified occlusion of left middle cerebral artery
- Secondary: H34.232 (CC)
- The CC status of H34.232 contributes to MCC/CC tally for the stroke DRG, potentially upgrading reimbursement
🔗 Related Diagnoses to Consider Coding Together
| Code | Description | Relationship to H34.232 |
|---|---|---|
| I10 | Essential hypertension | Most common comorbidity; nearly universal in BRAO patients |
| E78.5 | Hyperlipidemia, unspecified | Atherosclerotic risk factor; drives cholesterol emboli |
| I48.0 | Paroxysmal atrial fibrillation | Cardioembolic source; HCC 96 — always capture |
| I48.91 | Unspecified atrial fibrillation | Cardioembolic source; HCC 96 |
| I65.22 | Occlusion and stenosis of left carotid artery | Ipsilateral upstream embolic source for left eye BRAO |
| E11.9 | Type 2 diabetes mellitus w/o complications | Vascular risk factor; HCC 19 |
| I25.10 | Atherosclerotic heart disease of native coronary artery | Systemic atherosclerosis; HCC 88 |
| M31.6 | Other giant cell arteritis | Must rule out in patients >50; HCC 38 if confirmed |
| H35.022 | Neovascularization of retina, left eye | Late ischemic complication of BRAO |
| H53.412 | Scotoma involving central area, left eye | Visual field defect as a manifestation/sequela |
| H53.122 | Transient visual loss, left eye | May be a presenting symptom before BRAO confirmation |
| G45.3 | Amaurosis fugax | Excludes 1 — do not code with H34.232 for same episode |
| Z87.39 | Personal history of other specified conditions | Past ocular vascular event history documentation |
🩺 Diagnostic Workup — Medical Necessity Support for Associated CPT Codes
Proper documentation of the following supports medical necessity and reduces claim denial risk when billing CPT codes alongside H34.232:
| Study | CPT | Documentation Required |
|---|---|---|
| Fluorescein Angiography | 92235 | Indication: confirm ischemic zone, evaluate degree of capillary non-perfusion, rule out alternate etiology (NV, vasculitis), monitor for NV development |
| OCT Posterior Segment | 92134 | Indication: quantify inner retinal edema acutely; monitor GCL-IPL atrophy chronically; baseline and follow-up comparison |
| OCT Angiography | 92137 | Indication: non-invasive mapping of superficial/deep capillary plexus dropout; cannot bill same day as 92134 |
| Fundus Photography | 92250 | Indication: document plaque location, retinal pallor extent, NV presence; essential for baseline comparison visits |
| Photocoagulation (PRP) | 67228 | Indication: retinal neovascularization confirmed on FA or clinical exam secondary to ischemia from BRAO; document NV location and extent |
| E/M High Complexity | 99215/99205 | Document: complexity of MDM (new/established problem to examiner, extensive data review, high risk management); or time-based if total time documented |
📌 ICD-9-CM Crosswalk
| ICD-9-CM | Description |
|---|---|
| 362.32 | Arterial tributary or branch occlusion (no laterality in ICD-9) |
🧑💻 Coder Pearls
- H34.232 = left eye only. The “2” in the 6th character position locks this to the left eye. Triple-check before assigning — wrong laterality on a retinal code is a common audit flag.
- The artery/vein distinction matters enormously. H34.232 (branch artery occlusion) and H34.8320 (tributary/branch vein occlusion, left eye, with macular edema) are completely different pathologies with different treatments, different CPT codes, and different documentation requirements. Never confuse them.
- BRAO is a stroke equivalent — think systemically. Your job as a coder is to capture all documented cardiovascular comorbidities. Atrial fibrillation, carotid stenosis, and coronary artery disease carry HCC weight that BRAO itself does not.
- CC status has real dollar value. H34.232 is a CC in the inpatient MS-DRG system. As a secondary diagnosis on another admission, it can upgrade the DRG — always code it when documented.
- Never code G45.3 with H34.232 on the same encounter. Excludes 1 is absolute. Amaurosis fugax = transient and no structural lesion. BRAO = structural ischemic event. They are mutually exclusive by definition.
- OCTA (2025+) is the imaging frontier. 92137 launched January 1, 2025, and is ideal for BRAO staging. It’s mutually exclusive with 92134 same-day — monitor NCCI edits diligently.
- Query for laterality every time. If the op note, clinic note, or imaging report doesn’t specify left vs. right, query before defaulting to H34.239.
- Giant cell arteritis changes everything. If GCA is confirmed (M31.6), the management shifts to IV steroids and temporal artery biopsy — and your coding shifts too. Don’t miss the associated systemic codes.
- Neovascularization is a late complication — keep following. BRAO patients return for months; when NV develops, add H35.022 and support 67228 with FA documentation.
Sources: ICD-10-CM FY2026 Tabular List, CMS.gov; AAPC Codify H34.232 and H34.23 subcategory; CMS ICD-10-CM/PCS MS-DRG v42 Definitions Manual; CMS MS-DRG v37 CC/MCC Lists (H34.232 CC designation); FindACode H34 Group Listing; ECGWaves H34.232 Code Reference; CMS Billing & Coding: Scanning Computerized Ophthalmic Diagnostic Imaging A57600; Retina Today - OCT: What to Know for 2025; Retinal Physician - OCTA Documentation and NCCI Edits, Jan 2026; AAO/AHA Guideline - Retinal and Ophthalmic Artery Occlusions 2025; CMS 2025 Medicare Physician Fee Schedule Final Rule; PubMed - BRAO Visual Outcomes Community Study, Feb 2026