ICD-10 Code H31.121 – Diffuse secondary atrophy of choroid, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H31.121 – Diffuse secondary atrophy of choroid, right eye
What it is
H31.121 identifies diffuse secondary atrophy of the choroid in the right eye. It means the choroid has thinned or degenerated after another condition, not as a primary disorder.
Clinical signs
Findings may include chorioretinal thinning, pigmentary change, or reduced retinal support in the right eye. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents diffuse secondary atrophy of the choroid affecting the right eye. It is appropriate when the condition is described as secondary and the laterality is clearly right. If the note does not specify the eye or the cause, check documentation.
Do not use for
Do not use this code for primary choroidal atrophy or for unspecified laterality. Do not assign it when the record only mentions a general choroidal disorder without atrophy.
Coding tip
Confirm both “secondary” and “right eye” in the provider note before assigning H31.121.