ICD-10 Code G56.31 – Lesion of radial nerve, right upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G56.31 – Lesion of radial nerve, right upper limb
What it is
G56.31 identifies a lesion affecting the radial nerve in the right upper limb. Use it when the record documents right-sided radial nerve dysfunction, compression, injury, or neuropathy without a more specific diagnosis.
Clinical signs
Typical findings include pain, numbness, tingling, or weakness in the radial nerve distribution. Clinical features vary; refer to documentation for specific motor or sensory deficits.
When to use this code
Use this code when the provider documents a lesion of the right radial nerve and does not specify a different nerve disorder or a broader upper-limb neuropathy. It is appropriate for right-sided cases involving localized radial nerve impairment. If the note names a more exact etiology, code that condition instead.
Do not use for
Do not use it for left-sided or bilateral radial nerve lesions, or for unrelated wrist, elbow, or hand pain without nerve involvement. Check documentation if the record only states “neuropathy” or another nonspecific nerve problem.
Coding tip
Verify laterality in the note and match the code to the documented side before assigning G56.31.