Crystal's MCW Coder Hub🧬 ICD-10 CM H34.219 - Partial Retinal Artery Occlusion, Unspecified Eye
📋 Code Identity
| Field | Detail |
|---|---|
| ICD-10-CM Code | H34.219 |
| Full Descriptor | Partial Retinal Artery Occlusion, Unspecified Eye |
| Also Known As | Hollenhorst’s Plaque; Retinal Microembolism |
| 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) |
| Category | H34 - Retinal Vascular Occlusions |
| Subcategory | H34.21 - Partial Retinal Artery Occlusion |
| Laterality | 9th character = 9 (Unspecified Eye) |
⚠️ Laterality Reminder: Unspecified laterality (H34.219) should be used only when the medical record does not specify which eye is affected. Always query the provider to clarify laterality before defaulting to the unspecified code. Use H34.211 (right) or H34.212 (left) when documented.
🔬 Clinical Description
Partial retinal artery occlusion refers to an incomplete blockage of a retinal artery — one that does not fully cut off perfusion to the retina but significantly reduces blood flow to a portion of the retinal tissue. This is distinct from a central retinal artery occlusion (CRAO), which involves the main arterial trunk, or a branch retinal artery occlusion (BRAO), which involves a secondary vessel.
The pathophysiology commonly involves embolic disease, particularly cholesterol emboli (Hollenhorst plaques), calcific emboli from cardiac valves, or fibrin-platelet emboli. These plaques lodge at arterial bifurcations, causing partial ischemia to the inner retinal layers. The inner retina (ganglion cell layer, inner nuclear layer, nerve fiber layer) is highly oxygen-dependent and can begin to suffer ischemic damage within 90-120 minutes of compromised flow.
Clinically, patients may present with transient or persistent monocular visual loss, a visual field defect, or painless partial loss of vision in the affected eye. A fundoscopic exam may reveal retinal whitening/pallor (ischemic edema) in the affected quadrant, and the hallmark bright, refractile, yellow-orange cholesterol plaque at a vessel bifurcation (Hollenhorst plaque). Fundus fluorescein angiography (FA) will typically show delayed or absent arterial filling in the affected segment.
🧠 Systemic Association: Partial retinal artery occlusion is considered a harbinger of cerebrovascular and cardiovascular disease. It is associated with carotid artery disease, atrial fibrillation, hypertension, hyperlipidemia, and hypercoagulable states. Prompt systemic workup is critical to prevent stroke.
🌳 Code Tree
H34 - Retinal Vascular Occlusions
│
├── H34.0 - Transient Retinal Artery Occlusion
│ ├── H34.01 - Transient retinal artery occlusion, right eye
│ ├── H34.02 - Transient retinal artery occlusion, left eye
│ └── H34.03 - Transient retinal artery occlusion, bilateral
│
├── H34.1 - Central Retinal Artery Occlusion
│ ├── H34.10 - Central retinal artery occlusion, unspecified eye
│ ├── H34.11 - Central retinal artery occlusion, right eye
│ ├── H34.12 - Central retinal artery occlusion, left eye
│ └── H34.13 - Central retinal artery occlusion, bilateral
│
├── H34.2 - Other Retinal Artery Occlusions
│ ├── H34.21 - Partial Retinal Artery Occlusion
│ │ ├── H34.211 - Partial retinal artery occlusion, right eye
│ │ ├── H34.212 - Partial retinal artery occlusion, left eye
│ │ ├── H34.213 - Partial retinal artery occlusion, bilateral
│ │ └── H34.219 - Partial retinal artery occlusion, unspecified eye ◀ THIS CODE
│ └── H34.23 - Retinal Artery Branch Occlusion
│ ├── H34.231 - Retinal artery branch occlusion, right eye
│ ├── H34.232 - Retinal artery branch occlusion, left eye
│ ├── H34.233 - Retinal artery branch occlusion, bilateral
│ └── H34.239 - Retinal artery branch occlusion, unspecified eye
│
└── H34.8 - Other Retinal Vascular Occlusions
├── H34.81 - Central Retinal Vein Occlusion
└── H34.82 - Venous Engorgement
✅ Includes
- Hollenhorst’s plaque - a cholesterol embolus originating most commonly from an atherosclerotic plaque in the ipsilateral carotid artery; appears as a bright, refractile yellow-orange lesion at a retinal arterial bifurcation
- Retinal microembolism - microscopic embolic material causing partial arterial flow obstruction without complete vascular occlusion
- Partial ischemia of the inner retina secondary to incomplete arterial obstruction
🚫 Excludes
Excludes 1 (Cannot be coded together — mutually exclusive)
| Excluded Code | Description |
|---|---|
| G45.3 | Amaurosis fugax — transient monocular vision loss; coded separately under cerebrovascular disease. Do not code H34.219 with G45.3 simultaneously. |
🏥 HCC (Hierarchical Condition Category)
| Field | Detail |
|---|---|
| HCC Mapped? | ❌ No — H34.219 does not map to an HCC category under the CMS-HCC v28 model |
| Risk Adjustment Relevance | Low — retinal vascular occlusion codes in the H34 category generally do not carry HCC risk weight |
| RAF Score Contribution | None under standard MA risk adjustment |
📝 Coder Note: While this code does not drive HCC risk adjustment directly, it is critically important as a complication and comorbidity (CC) marker in the inpatient setting and supports medical necessity for high-level E/M coding in the outpatient setting. Always ensure co-existing conditions (e.g., hypertension I10, hyperlipidemia E78.5, atrial fibrillation I48.91) are captured — those do carry HCC weight.
🏨 MS-DRG (Medicare Severity DRG)
| Field | Detail |
|---|---|
| Primary MS-DRG Assignment | MS-DRG 124 - Other Disorders of the Eye with MCC |
| Alternate | MS-DRG 125 - Other Disorders of the Eye without MCC/CC |
| MDC | MDC 02 - Diseases and Disorders of the Eye |
Inpatient Tip: H34.219 as a principal diagnosis on an inpatient admission will typically land in MDC 02. The presence of MCCs (major complications/comorbidities) such as acute ischemic stroke (I63.9) or respiratory failure will shift the DRG from 125 → 124. When retinal artery occlusion is a secondary/comorbid diagnosis, it may serve as a CC and affect the DRG of the principal diagnosis.
💊 Associated CPT Codes (Commonly Reported With)
These are CPT codes commonly reported alongside H34.219 in ophthalmology (retina) practice. wRVU values reflect 2025 Medicare Physician Fee Schedule data.
| CPT Code | Description | wRVU (Facility) | wRVU (Non-Fac) | Assistant Payable? |
|---|---|---|---|---|
| 92235 | Fluorescein angiography with interpretation and report, unilateral or bilateral | 0.92 | 0.92 | No |
| 92134 | OCT posterior segment (retina), with interpretation and report | 0.00 | 0.00 | No |
| 92137 | OCT posterior segment with OCT angiography (OCTA), with interpretation and report (new 2025) | ~0.79 | ~0.79 | No |
| 92240 | Indocyanine-green (ICG) angiography with interpretation and report | 0.92 | 0.92 | No |
| 92242 | Combined fluorescein and ICG angiography | 1.38 | 1.38 | No |
| 92250 | Fundus photography with interpretation and report | 0.00 | 0.00 | No |
| 99244 | Office consultation, moderate complexity (if applicable, outpatient) | 2.10 | 3.17 | No |
| 67227 | Destruction of extensive/progressive retinopathy (when applicable) | 3.09 | 3.09 | No |
⚠️ 2025 OCTA Coding Update: New CPT code 92137 (OCT-A) took effect January 1, 2025. It cannot be billed with 92133 or 92134 at the same encounter. It can be billed separately on the same day as 92235, 92240, or 92242. As of October 1, 2025, OCTA is also bundled with eye codes and FA/ICG if performed on the same day — monitor NCCI edits closely.
🔧 Applicable Modifiers
| Modifier | Description | Use Case |
|---|---|---|
| -RT | Right side | Append to laterality-specific CPT codes when right eye |
| -LT | Left side | Append to laterality-specific CPT codes when left eye |
| -E1 | Upper left eyelid | Not typically applicable here |
| -50 | Bilateral procedure | When bilateral imaging is performed |
| -59 | Distinct procedural service | When unbundling is appropriate and documentation supports it |
| -25 | Significant, separately identifiable E/M on the same day as a procedure | When an E/M is performed on the same day as a diagnostic imaging procedure |
📝 Coding Examples
Example 1 — Outpatient Ophthalmology Clinic (Retina Specialist)
A 72-year-old male with known hypertension and carotid stenosis presents to retina clinic with sudden onset of a superior visual field defect in the left eye. Fundus exam reveals a Hollenhorst plaque at a temporal arterial bifurcation with surrounding retinal pallor. Fluorescein angiography confirms delayed filling. OCT-A is also performed and interpreted the same day.
Codes:
- Dx: H34.212 - Partial retinal artery occlusion, left eye (laterality specified)
- Dx: I10 - Essential hypertension
- CPT: 92235 - -LT - Fluorescein angiography, left eye
- CPT: 92137 - -LT - OCT with OCT angiography (Note: cannot bill 92134 on same day)
- CPT: 99244 - -25 - Office consultation, moderate complexity
Example 2 — Emergency Department (Inpatient Profee)
A 68-year-old female presents to the ED with acute painless monocular visual loss. Ophthalmology is consulted. Workup reveals a partial retinal artery occlusion, unspecified eye per the attending’s documentation (patient unable to confirm which eye was affected initially). MRI brain is negative for stroke. Patient is admitted for TIA workup.
Codes:
- Dx: H34.219 - Partial retinal artery occlusion, unspecified eye (use only when laterality truly not documented)
- Dx: G45.9 - Transient cerebral ischemic attack, unspecified (if documented as TIA workup)
- Dx: I10 - Essential hypertension
- CPT (profee consult): 99253 - Inpatient consultation, moderate complexity
🔍 Query Opportunity: If the provider documents unspecified eye, query: “The documentation indicates partial retinal artery occlusion, but does not specify laterality. Can you clarify whether this involves the right eye, left eye, or bilateral?”
Example 3 — Inpatient Facility Coding
Patient admitted for workup of retinal artery occlusion. No MCC/CC documented in the record.
MS-DRG Assignment:
- PDx: H34.219
- MS-DRG 125 - Other Disorders of the Eye without MCC/CC
If patient also has documented atrial fibrillation I48.91 (CC):
- MS-DRG 124 - Other Disorders of the Eye with MCC (depending on payer/severity of comorbidity)
🔗 Related Diagnoses to Consider Coding Together
| Code | Description | Notes |
|---|---|---|
| I10 | Essential hypertension | Very common comorbidity; code if documented |
| E78.5 | Hyperlipidemia, unspecified | Drives atherosclerotic emboli; code if documented |
| I48.91 | Unspecified atrial fibrillation | Cardioembolic source; code if documented |
| I65.29 | Occlusion and stenosis of unspecified carotid artery | Common upstream etiology |
| Z87.39 | Personal history of other endocrine, nutritional and metabolic diseases | If relevant |
| H53.10 | Unspecified subjective visual disturbances | If visual symptoms are the presenting complaint |
| G45.3 | Amaurosis fugax | Excludes 1 — do NOT code with H34.219 |
📌 ICD-9-CM Crosswalk
| ICD-9-CM | Description |
|---|---|
| 362.32 | Arterial tributary branch occlusion / partial retinal artery occlusion |
📚 Coding Tips & Coder Pearls
- Laterality first. Always default to a specific laterality code when the eye is documented. H34.219 is the last resort — not the default.
- Don’t confuse with amaurosis fugax. G45.3 is the correct code for transient monocular vision loss (amaurosis fugax), which is a TIA equivalent. Partial RAO is a structural finding on exam — a different entity.
- Think systemic. Retinal artery occlusion is an eye stroke. Always look for documentation of cardiovascular/cerebrovascular comorbidities to capture complete coding.
- Hollenhorst plaque = H34.219. This is explicitly listed in the includes note for H34.21x. You do not code this separately.
- OCTA bundling (2025 update). New CPT 92137 cannot be reported with 92134 on the same day. Watch NCCI edits on this.
- HCC opportunity is upstream. While H34.219 doesn’t map to HCC, documenting and coding the underlying cause (e.g., atrial fibrillation, carotid stenosis) is where the RAF score lives — capture those!
Sources: ICD-10-CM FY2026 Tabular List, CMS.gov; AAPC Codify ICD-10-CM H34.219; CMS Billing & Coding: Ophthalmic Angiography A56774; Retina Today - OCT: What to Know for 2025; Retinal Physician - OCTA Documentation and NCCI Edits Jan 2026; ASRS Retina Coding Update Mar 2025; CMS MS-DRG v42 Definitions Manual; CMS 2025 Medicare Physician Fee Schedule Final Rule