ICD-10 Code H50.63 – Inferior rectus muscle entrapment (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H50.63 – Inferior rectus muscle entrapment
What it is
H50.63 identifies entrapment of the inferior rectus muscle, usually from orbital trauma or fracture. The code describes mechanical restriction of eye movement caused by the muscle being trapped.
Clinical signs
Typical findings include limited upgaze, diplopia, and pain with eye movement. Clinical features vary; refer to documentation and imaging when available.
When to use this code
Use this code when the provider documents inferior rectus muscle entrapment as the diagnosis, such as after an orbital blowout fracture. It may also apply when imaging or surgical findings confirm the muscle is trapped. Check documentation if the record only states orbital fracture or eye movement restriction.
Do not use for
Do not use this code for nonspecific diplopia, general orbital fracture, or eye pain without documented inferior rectus entrapment. Check documentation if the note does not clearly identify the trapped muscle.
Coding tip
Link the code to the exact anatomic finding in the record, not just the injury mechanism.