ICD-10 Code H50.66 – Superior oblique muscle entrapment (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H50.66 – Superior oblique muscle entrapment
What it is
This code identifies entrapment of the superior oblique muscle, usually meaning the muscle is trapped or restricted by surrounding orbital tissues. It is used when the record specifically documents this diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings may include limited eye movement, diplopia, or pain with gaze if the muscle is mechanically restricted.
When to use this code
Use H50.66 when the clinician documents superior oblique muscle entrapment as the confirmed diagnosis. It may appear after orbital trauma, surgery, or imaging/operative findings showing muscle restriction. If the note only says eye movement problem without this diagnosis, check documentation.
Do not use for
Do not use this code for general strabismus, nonspecific diplopia, or other extraocular muscle disorders unless superior oblique entrapment is explicitly documented. Check documentation when the diagnosis is uncertain.
Coding tip
Assign this code only when the provider clearly names superior oblique muscle entrapment; otherwise, code the documented eye disorder.