ICD-10 Code H50.631 – Inferior rectus muscle entrapment, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H50.631 – Inferior rectus muscle entrapment, right eye
What it is
This code identifies entrapment of the inferior rectus muscle in the right eye, usually from trauma or orbital injury. It means the muscle is mechanically trapped, limiting normal eye movement.
Clinical signs
Typical findings include restricted upward gaze, diplopia, and pain or discomfort with eye movement. Clinical features vary; refer to documentation, especially imaging or specialist exam notes.
When to use this code
Use H50.631 when the record clearly documents inferior rectus muscle entrapment affecting the right eye. It may follow orbital fracture, surgery, or other injury with confirmed mechanical restriction.
Code it when the provider specifies the right side and the diagnosis is not merely suspected. Check documentation if the note describes diplopia or fracture without confirmed entrapment.
Do not use for
Do not use this code for general diplopia, orbital fracture alone, or unspecified extraocular muscle injury. Check documentation if laterality or the exact trapped muscle is unclear.
Coding tip
Verify the right-eye laterality and the word “entrapment” in the provider note before assigning H50.631.