ICD-10 Code H35.421 – Microcystoid Degeneration of Retina, Right Eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H35.421 – Microcystoid degeneration of retina, right eye
What it is
H35.421 identifies microcystoid degeneration affecting the retina in the right eye. Use it when documentation specifically states this retinal degenerative change and laterality.
Clinical signs
Clinical features vary; refer to documentation. Findings may include retinal cystic or microcystic changes noted on eye examination or imaging, with the right eye clearly specified.
When to use this code
Use this code when the provider diagnoses microcystoid degeneration of the retina in the right eye. It is appropriate for ophthalmology notes, problem lists, or imaging reports that name the condition and laterality. If the record says only “retinal degeneration” or does not specify the right eye, check documentation.
Do not use for
Do not use H35.421 for left eye or bilateral retinal degeneration. Do not assign it when the chart describes another retinal disorder, such as detachment, edema, or macular disease, unless microcystoid degeneration is separately documented.
Coding tip
Verify both the exact retinal diagnosis and laterality before coding; H35.421 is right-eye specific.