ICD-10 Code H50.649 – Lateral rectus muscle entrapment, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H50.649 – Lateral rectus muscle entrapment, unspecified eye
What it is
This code identifies entrapment of the lateral rectus muscle in an unspecified eye. It usually reflects restricted eye movement caused by mechanical trapping of the muscle, often after trauma or surgery.
Clinical signs
Typical findings include limited abduction, diplopia, and pain with eye movement. Clinical features vary; refer to documentation for the affected eye and the cause of entrapment.
When to use this code
Use this code when documentation states lateral rectus muscle entrapment but does not specify right or left eye. It may also apply when the provider documents mechanical restriction of the lateral rectus without naming a more specific strabismus or injury code. Confirm the record supports entrapment rather than simple weakness or palsy.
Do not use for
Do not use it for lateral rectus palsy, unspecified strabismus, or general eye trauma without documented muscle entrapment. Check documentation if the diagnosis is only suspected.
Coding tip
Assign the unspecified-eye code only when laterality is not documented; otherwise, code the right or left eye specifically.