ICD-10 Code H35.42 – Microcystoid degeneration of retina (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H35.42 – Microcystoid degeneration of retina
What it is
H35.42 identifies microcystoid degeneration of the retina, a retinal degenerative change with tiny cyst-like spaces in the retinal tissue. Use it when the record specifically documents this diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Findings may include retinal degeneration seen on eye examination or imaging, sometimes with reduced visual function if the condition is advanced.
When to use this code
Use H35.42 when the ophthalmology note clearly states microcystoid degeneration of the retina. It is appropriate for documented retinal degeneration without a more specific alternate diagnosis. Check documentation if the chart uses vague terms such as retinal changes or cystic appearance.
Do not use for
Do not use this code for unrelated retinal disorders, edema, or cysts without documented microcystoid degeneration. If the provider names a different retinal condition, code that diagnosis instead.
Coding tip
Code only from the provider’s exact retinal diagnosis and avoid inferring microcystoid degeneration from imaging language alone.