ICD-10 Code H31.12 – Diffuse secondary atrophy of choroid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H31.12 – Diffuse secondary atrophy of choroid
What it is
H31.12 identifies diffuse secondary atrophy of the choroid, meaning widespread thinning or wasting of the choroidal tissue after another eye condition or injury. Use it when the record clearly documents secondary choroidal atrophy rather than a primary disorder.
Clinical signs
Findings may include diffuse choroidal thinning, pigmentary change, and reduced choroidal support on eye examination or imaging. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents diffuse secondary choroidal atrophy as the diagnosis, especially when it is linked to a prior ocular disease, inflammation, trauma, or other underlying cause. Code the documented condition exactly as stated. If the note only mentions choroidal changes without specifying secondary atrophy, check documentation.
Do not use for
Do not use it for primary choroidal atrophy or for nonspecific retinal or choroidal degeneration without documented secondary atrophy. Do not assign it when the chart does not clearly support the diagnosis.
Coding tip
Confirm that “secondary” and “diffuse” are both documented before selecting H31.12.