ICD-10 Code H05.121 – Orbital myositis, right orbit (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.121 – Orbital myositis, right orbit
What it is
H05.121 identifies inflammation of the extraocular muscles in the right orbit. Use it when documentation specifically states orbital myositis affecting the right eye socket.
Clinical signs
Common findings include eye pain, swelling, and painful or restricted eye movement. Clinical features vary; refer to documentation for the confirmed laterality and orbital muscle involvement.
When to use this code
Use this code when the provider diagnoses orbital myositis of the right orbit and documents laterality clearly. It is appropriate for outpatient, inpatient, or specialist records that describe inflammatory involvement of the right extraocular muscles. Check documentation if the note only says orbital inflammation or eye pain.
Do not use for
Do not use H05.121 for nonspecific orbital pain, cellulitis, or other orbital disorders without myositis. If the right orbit is not documented, check documentation before coding.
Coding tip
Assign H05.121 only when the provider names right orbital myositis; laterality matters.