H34.21 Partial retinal artery occlusion

The ICD-10-CM code for Partial retinal artery occlusion is H34.21 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

7: Diseases of the eye and adnexa (H00-H59)

Section

H30-H36: Disorders of choroid and retina (H30-H36)

Category H34

39 codes (21 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to H34.21:

• Occlusion, occluded › artery › retinal › partial

Inclusion Terms

• Hollenhorst's plaque
• Retinal microembolism

Official Coding Guidelines

Glaucoma (TOC entry)

a. Glaucoma .............................................................................................................................. 48

Assigning glaucoma codes (use as many H40 codes as needed)

Assign as many codes from category H40, Glaucoma, as needed to identify the type of glaucoma, the affected eye, and the glaucoma stage.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool