ICD-10 Code H31.20 – Hereditary choroidal dystrophy, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H31.20 – Hereditary choroidal dystrophy, unspecified
What it is
Use this code for a hereditary, unspecified dystrophy affecting the choroid, the vascular layer beneath the retina. It indicates a documented inherited choroidal disorder when the exact subtype is not named.
Clinical signs
Clinical features vary; refer to documentation. Findings may include inherited choroidal degeneration with visual disturbance or abnormal fundus changes, but the record should support a choroidal dystrophy diagnosis.
When to use this code
Assign H31.20 when the provider documents hereditary choroidal dystrophy and does not specify a more precise form. Use it for ophthalmology notes, problem lists, or assessments that clearly identify the condition as inherited and choroidal.
If the chart only mentions retinal disease, macular degeneration, or an undifferentiated visual complaint, you should not infer this code. Check documentation for the exact anatomic site and hereditary nature.
Do not use for
Do not use this code for nonhereditary choroidal disorders or for retinal dystrophies that are not documented as choroidal. Check documentation when the diagnosis is vague or mixed with other posterior segment disease.
Coding tip
Query the provider if the note says “hereditary dystrophy” without naming the choroid, because H31.20 requires choroidal involvement.