ICD-10 Code H05.821 – Myopathy of extraocular muscles, right orbit (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.821 – Myopathy of extraocular muscles, right orbit
What it is
This code identifies a disorder affecting the extraocular muscles in the right orbit. Use it when documentation states myopathy limited to the right eye’s orbital muscles, not a generalized muscle disease.
Clinical signs
Clinical features vary; refer to documentation. Commonly, extraocular muscle disorders may present with eye movement limitation, diplopia, or orbital discomfort, but the record should specify right orbital involvement.
When to use this code
Use H05.821 when the provider documents myopathy of the extraocular muscles in the right orbit, including imaging or exam findings that support localized orbital muscle disease. You should code it when the condition is confirmed and laterality is clearly right. If the note is vague, check documentation before assigning the code.
Do not use for
Do not use this code for generalized myopathy, unspecified orbital disease, or disorders affecting the left orbit or both orbits. Do not assume laterality if the record does not state right orbit.
Coding tip
Always verify laterality and make sure the documentation names the extraocular muscles, not just diplopia or eye pain.