ICD-10 Code H05.312 – Atrophy of left orbit (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.312 – Atrophy of left orbit
What it is
H05.312 identifies atrophy, or wasting, of the tissues in the left orbit. Use it when documentation states the left eye socket has become smaller or thinned.
Clinical signs
Findings may include visible hollowing of the left orbit, reduced orbital volume, or asymmetry of the eyes. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents atrophy limited to the left orbit and does not specify a different orbital disorder. It may be used in ophthalmology or imaging notes describing unilateral orbital wasting. Check documentation if the cause is also recorded, because coding may depend on the stated diagnosis.
Do not use for
Do not use it for general facial wasting, enophthalmos without orbital atrophy, or unspecified orbital disease. Do not assume laterality if the record does not clearly identify the left side.
Coding tip
Verify that the chart explicitly says “left orbit” and “atrophy” before assigning H05.312.