ICD-10 Code G56.3 – Lesion of radial nerve (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G56.3 – Lesion of radial nerve
What it is
G56.3 identifies injury, compression, or other disorder affecting the radial nerve. Use it when the record documents radial nerve involvement rather than a more general upper-extremity neuropathy.
Clinical signs
Typical findings include weakness of wrist or finger extension, sensory changes over the dorsal hand or posterior forearm, and possible “wrist drop.” Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents lesion, palsy, compression, or neuropathy of the radial nerve. It also fits confirmed radial nerve dysfunction after trauma, entrapment, or another specified cause. Check documentation if the note only says arm pain or numbness without nerve identification.
Do not use for
Do not use G56.3 for cervical radiculopathy, brachial plexus disorders, or nonspecific neuropathy without radial nerve involvement. If the record names another nerve or site, code that condition instead.
Coding tip
Code the radial nerve lesion only when the provider clearly links symptoms or examination findings to that nerve.