ICD-10 Code H05.12 – Orbital myositis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.12 – Orbital myositis
What it is
H05.12 identifies inflammation of one or more extraocular muscles within the orbit. Use it when documentation states orbital myositis, a localized inflammatory condition affecting eye movement muscles.
Clinical signs
Typical findings include eye pain, painful or restricted eye movement, swelling, and sometimes proptosis. Clinical features vary; refer to documentation.
When to use this code
Use H05.12 when the provider documents orbital myositis or inflammatory myopathy of the extraocular muscles. Apply it for confirmed orbital muscle inflammation, not for nonspecific orbital pain alone. If the note does not clearly specify the diagnosis, check documentation before coding.
Do not use for
Do not use this code for general eye muscle disorders, strabismus, or orbital cellulitis unless orbital myositis is specifically documented. Check documentation for the exact diagnosis.
Coding tip
Code H05.12 only when the record clearly links the inflammation to the orbital muscles, not merely to the orbit itself.