ICD-10 Code H05.03 – Periostitis of Orbit (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.03 – Periostitis of orbit
What it is
H05.03 identifies inflammation of the periosteum around the eye socket, also called the orbit. It is used when the documentation specifically describes periostitis involving the orbital bones.
Clinical signs
Clinical features may include orbital pain, tenderness, swelling, and sometimes redness around the eye. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents periostitis of the orbit, orbital periostitis, or equivalent wording. It fits cases where the inflammation is localized to the periosteal tissue of the orbit and not described more broadly as another orbital disorder. Check documentation if the diagnosis is uncertain.
Do not use for
Do not use H05.03 for nonspecific eye pain, cellulitis, or other orbital infections unless periostitis is documented. If the record only mentions orbital inflammation without periosteal involvement, check documentation.
Coding tip
Code from the provider’s exact diagnosis wording and avoid assuming periostitis from imaging or symptoms alone.