2026 ICD-10-CM Diagnosis Code H34.8121Central retinal vein occlusion, left eye, with retinal neovascularization

ICD-10-CM Codes›H00–H59›H30-H36›H34

ICD-10-CM H34.8121
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H34.8121 is a billable ICD-10-CM diagnosis code for central retinal vein occlusion, left eye, with retinal neovascularization. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as neovascularization of left retina. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Retinal and vitreous conditions.

Code Identity

ICD-10-CM Code
H34.8121
Billable Status
Yes — Valid for Submission
Code Describes
Central retinal vein occlusion, left eye, with retinal neovascularization
Short Description
Central retinal vein occlusion, left eye, w rtnl neovas
Parent Code
H34.812
Central retinal vein occlusion, left eye

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH30-H36Disorders of choroid and retina
CategoryH34Retinal vascular occlusions
This CodeH34.8121Central retinal vein occlusion, left eye, with retinal neovascularization

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Neovascularization of left retina
  • Retinal neovascularization due to occlusion of central retinal vein of left eye

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE005
Retinal and vitreous conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Retinal Disorders

The retina is a layer of tissue in the back of your eye that senses light and sends images to your brain. In the center of this nerve tissue is the macula. It provides the sharp, central vision needed for reading, driving and seeing fine detail.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H34.8121 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
362.35 Cent retinal vein occlus
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement H34.8121 replaces the following previously assigned code(s):

  • H34.812 - Central retinal vein occlusion, left eye
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H34.8121Overview

Is H34.8121 (Central retinal vein occlusion, left eye) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report central retinal vein occlusion, left eye, with retinal neovascularization on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of H34.8121?

Under the General Equivalence Mappings, central retinal vein occlusion, left eye, with retinal neovascularization converts to ICD-9-CM 362.35 (cent retinal vein occlus). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.