ICD-10 Code H05.31 – Atrophy of Orbit (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.31 – Atrophy of orbit
What it is
H05.31 identifies atrophy of the orbit, meaning wasting or loss of orbital tissues around the eye. Use it when the record specifically documents orbital atrophy rather than a more general eye disorder.
Clinical signs
Clinical features may include a sunken-appearing eye, reduced orbital volume, or visible asymmetry of the eye socket. Findings vary; refer to documentation for the exact cause and extent.
When to use this code
Use this code when the clinician documents atrophy involving the orbit and the diagnosis is confirmed in the chart. It is appropriate for encounters focused on evaluation, follow-up, or coding of the documented orbital condition. If the note only mentions eye atrophy or enophthalmos without orbital atrophy, check documentation.
Do not use for
Do not use H05.31 for nonspecific eye complaints, cosmetic concerns, or other orbital disorders not documented as atrophy. Do not assume the code applies to injury-related deformity unless the record states orbital atrophy.
Coding tip
Code from the provider’s exact wording and verify whether the atrophy is orbital, ocular, or due to another listed condition.