ICD-10 Code H05.129 – Orbital Myositis, Unspecified Orbit (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.129 – Orbital myositis, unspecified orbit
What it is
H05.129 identifies inflammation of one or more extraocular muscles in the orbit when the affected side is not specified. Use it for documented orbital myositis without laterality detail.
Clinical signs
Typical findings include painful eye movement, orbital pain, diplopia, and restricted motility. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents orbital myositis and does not state right or left orbit. It is also appropriate when the note confirms orbital muscle inflammation but laterality is unavailable or unclear.
If the record later specifies the orbit, code to the more precise laterality-specific option instead. Check documentation for associated orbital findings and the exact diagnosis wording.
Do not use for
Do not use this code for nonspecific eye pain, conjunctivitis, or general orbital inflammation without myositis. Do not assign it when the provider documents a different orbital disorder.
Coding tip
Verify laterality in the assessment, imaging report, or final diagnosis before choosing an unspecified-orbit code.