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ICD-10-CM 2027 diagnosis code

H34.8120Central retinal vein occlusion, left eye, with macular edema

✓ Billable / specificRequires 7th characterCC — complication/comorbidity

H34.8120 is a valid, billable ICD-10-CM code for central retinal vein occlusion, left eye, with macular edema. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H34.8120

H34.8120 is the ICD-10-CM diagnosis code for central retinal vein occlusion, left eye, with macular edema. It belongs to category H34 (retinal vascular occlusions), block H30-H36 (disorders of choroid and retina) and chapter 7 (diseases of the eye and adnexa). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "0" means with macular edema.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 123 (Neurological Eye Disorders, relative weight 0.822), in MDC 02 (Diseases and Disorders of the Eye), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2017, effective October 1, 2016.

Before ICD-10, this condition was coded in ICD-9-CM as 362.35 (central retinal vein occlusion).

7th character

0with macular edema

Other encounter types for H34.812:

Notes that apply from higher levels

Instructions written at a parent level also apply to H34.8120.

› From H34 Retinal vascular occlusions
Excludes1

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 02 · Diseases and Disorders of the Eye

ICD-9-CM equivalent

Converter →
  • 362.35Central retinal vein occlusionapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2017 (effective 10/1/2016): Added
  • No changes since FY2017.

Common questions about H34.8120

Is H34.8120 billable?

Yes. H34.8120 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "0" at the end of H34.8120 mean?

It is the 7th character for with macular edema.

Can H34.8120 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H34.8120 as a principal diagnosis.

Is H34.8120 a CC or MCC?

H34.8120 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does H34.8120 group to?

H34.8120 is used in the MS-DRG v44.0 logic for MS-DRG 123 (Neurological Eye Disorders). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for H34.8120?

The CMS General Equivalence Mappings map H34.8120 to ICD-9-CM 362.35.