ICD-10 Code H05.81 – Cyst of orbit (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.81 – Cyst of orbit
What it is
H05.81 identifies a cyst located in the orbit, the bony socket that holds the eye. Use it when documentation clearly states an orbital cyst without a more specific type.
Clinical signs
Clinical features vary; refer to documentation. Orbital cysts may be noted as a mass, swelling, or displacement of the eye on exam or imaging.
When to use this code
Use H05.81 when the provider documents a cyst of the orbit as the diagnosis, especially after imaging or specialist evaluation. It also fits when the record identifies an orbital cyst but does not specify a more exact orbital disorder.
If the note describes a cystic lesion in the orbit and no alternate code is documented, this code is appropriate. Check documentation for laterality, cause, or a more specific orbital condition.
Do not use for
Do not use this code for cysts in the eyelid, conjunctiva, or other non-orbital eye structures. Do not assign it if the documentation names a different orbital mass or lesion.
Coding tip
Confirm the provider specifically documents “orbit” before coding H05.81, and query for a more specific diagnosis if available.