ICD-10 Code H50.64 – Lateral rectus muscle entrapment (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H50.64 – Lateral rectus muscle entrapment
What it is
This code identifies entrapment of the lateral rectus muscle, usually from trauma or orbital injury. It means the muscle is mechanically trapped, limiting normal eye movement.
Clinical signs
Typical findings include restricted abduction, diplopia, and pain or discomfort with eye movement. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents lateral rectus muscle entrapment as the diagnosis, often after orbital fracture or other injury. It may also apply when imaging or surgical findings confirm the muscle is trapped. Code only when the record clearly identifies the lateral rectus muscle.
Do not use for
Do not use this code for general strabismus, isolated abduction weakness, or unspecified extraocular muscle injury. Check documentation if the note does not clearly state entrapment.
Coding tip
Verify the exact muscle named in the record, because extraocular muscle entrapment codes are site-specific.