ICD-10 Code H31.129 – Diffuse secondary atrophy of choroid, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H31.129 – Diffuse secondary atrophy of choroid, unspecified eye
What it is
Use this code for diffuse secondary atrophy of the choroid when the affected eye is not specified. It describes generalized choroidal thinning or wasting that occurs secondary to another ocular process.
Clinical signs
Clinical features vary; refer to documentation. Findings may include choroidal atrophy noted on ophthalmic examination or imaging, with reduced choroidal tissue related to a prior eye condition.
When to use this code
Assign H31.129 when the provider documents diffuse secondary atrophy of the choroid and does not identify right, left, or bilateral eye involvement. Use it when the record clearly links the atrophy to a secondary cause, not a primary choroidal disorder.
Do not use for
Do not use this code for primary choroidal degeneration or for choroidal conditions without documented atrophy. If the provider specifies an eye laterality, check documentation and choose the more specific code.
Coding tip
Verify both laterality and the secondary nature of the condition before coding.