ICD-10 Code H05.35 – Exostosis of orbit (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.35 – Exostosis of orbit
What it is
H05.35 identifies an abnormal bony outgrowth involving the orbit. Use it when documentation specifically describes exostosis of the orbital bones.
Clinical signs
Clinical features vary; refer to documentation. Orbital exostosis may be noted on imaging or exam as a hard bony mass, sometimes with visible prominence or local mass effect.
When to use this code
Use this code when the provider documents exostosis of the orbit as the diagnosis. It is appropriate when imaging, surgery, or specialist notes confirm an orbital bony overgrowth.
If the record only says orbital mass, bony lesion, or bone spur without naming exostosis, check documentation before coding. Code the documented condition, not a presumed cause.
Do not use for
Do not use H05.35 for nonbony orbital masses, inflammatory swelling, or unspecified orbital lesions. If the diagnosis is different or unclear, check documentation.
Coding tip
Code the exact orbital site only when exostosis is explicitly documented; otherwise, query for clarification.