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H34.9

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🧬ICD-10 CM H34.9 - Unspecified Retinal Vascular Occlusion

Short Definition

Unspecified occlusion of retinal artery or vein, laterality not specified.

Long Definition

H34.9 represents unspecified retinal vascular occlusion, used when documentation confirms retinal vascular occlusion but does not specify artery versus vein, location (central, branch, etc.), laterality (right, left, bilateral), or complications (macular edema, neovascularization, stable). Retinal vascular occlusions are acute vascular events causing retinal ischemia and/or hemorrhage, leading to vision loss. Arterial occlusions result from thromboembolism or vasculopathy, producing pale retina with cherry-red macula; venous occlusions cause retinal hemorrhages (“blood and thunder”), cotton-wool spots, and macular edema. Systemic workup for cardiovascular risk factors (hypertension, diabetes, hyperlipidemia, coagulopathy) is mandatory. H34.9 is a nonspecific code; query providers for specificity (for example, H34.81- for central retinal artery occlusion) when possible, as it supports medical necessity for urgent retinal specialist referral, anti-VEGF therapy, and systemic evaluation.

Area of Body

Eye - Retina (unspecified laterality)

  • Retinal arterioles and venules
  • Macula and fovea (often affected)
  • Optic disc and peripheral retina
  • Associated systemic: carotid arteries, cardiac emboli sources, hypercoagulable states

Code Hierarchy/Tree

H00-H59: Diseases of the eye and adnexa
└─ H30-H36: Disorders of choroid and retina
└─ H34: Retinal vascular occlusions
├─ H34.0: Transient retinal artery occlusion
├─ H34.1: Central retinal artery occlusion
├─ H34.2: Other retinal artery occlusions
├─ H34.8: Other retinal vascular occlusions
│ └─ H34.81: Central retinal vein occlusion
│ └─ H34.82: Venous engorgement
│ └─ H34.83: Tributary (branch) retinal vein occlusion
└─ H34.9: Unspecified retinal vascular occlusion

Includes

  • Retinal vascular occlusion NOS
  • Occlusion of retinal artery or vein, unspecified type
  • Retinal artery occlusion NOS
  • Retinal vein occlusion NOS
  • Documentation stating “retinal vascular occlusion” without further specification of artery/vein or location

Excludes 1

  • G45.3 - Amaurosis fugax (transient monocular blindness; code separately as it is a neurologic event)

Excludes 2

None specified (may be reported with comorbid conditions like hypertension, diabetes)

HCC Information

HCC Status: Non-HCC

  • Not included in Hierarchical Condition Categories for risk adjustment
  • Functions as a CC (Complication/Comorbidity) in MS-DRG v42.0 (DRG 123-125)

RVU Information

wRVU: N/A

  • Diagnosis codes have no work RVUs
  • RVUs apply to associated CPT procedure codes (for example, 67028 for anti-VEGF injection: ~1.5-2.0 wRVU per eye)

Assistant Surgeon: N/A

  • Not applicable to diagnosis codes

MS-DRG Information

MS-DRG Assignment (Principal Diagnosis):

  • MDC 07: Diseases & Disorders of the Eye
  • DRG 123: Neurological Eye Disorders with MCC
  • DRG 124: Neurological Eye Disorders with CC
  • DRG 125: Neurological Eye Disorders without CC/MCC

Note

Notes: H34.9 is a CC; more specific H34.- codes with complications (for example, macular edema) may elevate to MCC status.

Common CPT Codes Used With H34.9

Evaluation & Management

  • 92004 - Comprehensive ophthalmologic exam, new patient (initial presentation)
  • 92014 - Comprehensive ophthalmologic exam, established patient (follow-up)
  • 99203-99205 - Office/outpatient E/M for systemic workup coordination

Diagnostic Procedures

  • 92134 - Scanning computerized ophthalmic diagnostic imaging, posterior segment, with interpretation and report (OCT for macular edema)
  • 92201 - Ophthalmoscopy, extended, with retinal drawing
  • 92235 - Fluorescein angiography (with or without indocyanine green angiography)
  • 92250 - Fundus photography with interpretation
  • 92083 - Visual field examination, extended
  • 93880 - Duplex scan of extracranial arteries; bilateral (carotid Doppler for embolic source)

Treatment Procedures

  • 67028 - Intravitreal injection of pharmacologic agent (anti-VEGF for macular edema/neovascularization)
  • 67039 - Vitrectomy, mechanical, pars plana approach (for vitreous hemorrhage or complications)
  • 67228 - Treatment of extensive or progressive retinopathy (laser for neovascularization)
  • 67145 - Prophylaxis of retinal detachment (laser barricade if needed)

Common Modifiers

ModifierDescriptionUsage Context
-RT/-LTRight/Left eyeSpecify laterality if unilateral
-50Bilateral procedureIf both eyes affected
-25Significant, separately identifiable E/ME/M + diagnostic procedure same day
-59Distinct procedural serviceMultiple injections or tests same session
-LT/-RTFor bilateral injectionsOne modifier per eye (for example, 67028-RT, 67028-LT)

Coding Examples

Example 1: Initial Presentation - Unspecified Retinal Vascular Occlusion

Scenario: 72-year-old with sudden painless vision loss in right eye. Fundus exam shows retinal hemorrhages and edema consistent with vascular occlusion, type unspecified. Urgent referral to retina specialist.

Coding:

  • H34.9 - Unspecified retinal vascular occlusion (right eye if laterality documented)
  • Z01.110 - Encounter for screening for malignant neoplasm of eye (if needed)
  • CPT: 92004 - Comprehensive new patient exam + 92134 - OCT

Documentation: Visual acuity 20/200 OD, fundus findings of retinal whitening/hemorrhages, urgent retina referral, systemic workup ordered.

Example 2: Follow-up with Anti-VEGF Injection

Scenario: Established patient with documented retinal vascular occlusion returns for macular edema treatment. OCT shows persistent edema; anti-VEGF injection administered.

Coding:

  • H34.9 + H35.81 - Retinal vascular occlusion with retinal edema
  • Z68.41 - BMI 40.0-44.9 if relevant comorbidity
  • CPT: 92014 - Exam + 67028-RT - Intravitreal injection right eye + 92134 - OCT

Documentation: Pre-injection VA 20/100, OCT central thickness 450μm, injection #3 of aflibercept, risks/benefits discussed.

Example 3: Inpatient Admission with Complication

Scenario: 68-year-old admitted for acute stroke; ophthalmology consult reveals retinal vascular occlusion contributing to visual field defect.

Coding:

  • Principal: I63.9 - Cerebral infarction, unspecified
  • Secondary: H34.9 - Retinal vascular occlusion + I10 - Hypertension
  • CPT: 99252 - Initial inpatient consult (ophthalmology)

MS-DRG Impact: H34.9 as CC may shift DRG within stroke grouping.

Example 4: Bilateral Unspecified Occlusion

Scenario: Patient with bilateral retinal vascular occlusions (artery/vein unspecified), treated with bilateral anti-VEGF.

Coding:

  • H34.9 (unspecified does not require laterality extension; query for specificity)
  • CPT: 67028-50 - Bilateral intravitreal injections (if payer allows -50; otherwise -RT and -LT separately)

Documentation: Bilateral macular edema secondary to vascular occlusions, injections tolerated.

Example 5: Systemic Workup Coordination

Scenario: Primary care follow-up after retinal vascular occlusion diagnosis; ordering carotid Doppler and cardiology referral.

Coding:

  • H34.9 - Retinal vascular occlusion
  • I10 - Hypertension + E78.5 - Hyperlipidemia
  • CPT: 99214 - Established patient E/M + 93880 - Carotid duplex bilateral

Documentation: Recent retinal vascular occlusion increases stroke risk; labs/imaging ordered, cardiology referral.

Clinical Considerations

  • Urgent referral: All retinal vascular occlusions to retina specialist within 24-48 hours
  • Systemic evaluation: Carotid ultrasound, Holter monitor, hypercoagulable workup, lipids, HbA1c
  • Anti-VEGF standard: For macular edema (common complication)
  • Avoid H34.9 long-term: Query for artery/vein, laterality, complications
  • Vision prognosis: Variable; arterial worse than venous; early treatment improves outcomes

Documentation Requirements

  1. Confirm vascular occlusion via fundus exam/OCT/FA
  2. Note acuity, laterality, artery vs. vein if identifiable
  3. Document complications (edema, neovascularization, vitreous hemorrhage)
  4. Systemic risk factors and workup plan
  5. Treatment plan and specialist referral

Last Updated: FY 2026 ICD-10-CM Code Status: Active/Billable

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