ICD-10 Code H02.51 – Abnormal innervation syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H02.51 – Abnormal innervation syndrome
What it is
H02.51 identifies abnormal innervation syndrome, a disorder where the eyelid moves or responds in an unusual way because of nerve misdirection or abnormal nerve supply. Use this code for the documented syndrome, not for a general eyelid complaint.
Clinical signs
Clinical features vary; refer to documentation. Findings may include abnormal eyelid movement associated with eye movement or other signs of misdirected innervation affecting the eyelid.
When to use this code
Use H02.51 when the provider documents abnormal innervation syndrome as the diagnosis. It is appropriate when the record describes an eyelid movement abnormality caused by abnormal nerve innervation, not when the note only says ptosis, spasm, or unspecified eyelid disorder.
Do not use for
Do not use this code for routine eyelid droop, eyelid spasm, or other clearly named eyelid conditions unless abnormal innervation syndrome is specifically documented. Check documentation.
Coding tip
Code the documented syndrome exactly and query the provider if the note describes eyelid mismovement without naming abnormal innervation.