ICD-10 Code G56.22 – Lesion of ulnar nerve, left upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G56.22 – Lesion of ulnar nerve, left upper limb
What it is
G56.22 identifies injury or dysfunction of the ulnar nerve in the left upper limb. Use it when the documented problem is localized to the left side and involves nerve lesion, not a general arm pain complaint.
Clinical signs
Typical findings include numbness, tingling, or weakness in the ulnar nerve distribution, often affecting the ring and little fingers. Clinical features vary; refer to documentation for the exact side and nerve involvement.
When to use this code
Use this code when the provider documents a lesion, neuropathy, or injury of the left ulnar nerve. It also fits confirmed left-sided ulnar nerve dysfunction after examination, imaging, or electrodiagnostic testing. Check documentation if the record only states hand symptoms without nerve localization.
Do not use for
Do not use it for right-sided or unspecified ulnar nerve conditions, or for symptoms alone without a documented nerve lesion. If the diagnosis is broader or unclear, check documentation.
Coding tip
Confirm the left laterality and that the provider documented ulnar nerve involvement before assigning G56.22.