ICD-10 Code H31.123 – Diffuse secondary atrophy of choroid, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H31.123 – Diffuse secondary atrophy of choroid, bilateral
What it is
This code identifies diffuse secondary atrophy of the choroid in both eyes. It means the choroidal tissue has thinned or wasted away due to another underlying cause, not a primary choroid disorder.
Clinical signs
Clinical features vary; refer to documentation. Findings may include bilateral choroidal thinning noted on eye examination or imaging, along with vision changes if documented by the ophthalmologist.
When to use this code
Use H31.123 when the provider documents diffuse secondary atrophy of the choroid affecting both eyes. This is appropriate when the record clearly links the atrophy to a secondary cause and specifies bilaterality. If the note only says choroidal atrophy without laterality or cause, check documentation.
Do not use for
Do not use this code for primary choroidal atrophy or for unilateral disease. If the chart describes another retinal or choroidal disorder without atrophy, code the documented condition instead.
Coding tip
Confirm both the secondary nature and bilateral laterality before assigning H31.123.