ICD-10 Code G56.2 – Lesion of ulnar nerve (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G56.2 – Lesion of ulnar nerve
What it is
G56.2 identifies a disorder of the ulnar nerve, usually from compression, injury, or irritation. It covers symptoms and dysfunction traced to that nerve rather than a generalized neuropathy.
Clinical signs
Typical findings include numbness or tingling in the ring and little fingers, hand weakness, and possible intrinsic muscle wasting. Clinical features vary; refer to documentation.
When to use this code
Use G56.2 when the record documents a lesion, entrapment, or neuropathy of the ulnar nerve and the provider links the symptoms to that nerve. It may apply to cubital tunnel or other ulnar nerve sites if the note does not specify a different, more exact diagnosis. Check documentation when laterality or cause is unclear.
Do not use for
Do not use this code for nonspecific hand pain, cervical radiculopathy, or generalized peripheral neuropathy. If the chart identifies a different nerve or a traumatic nerve injury, code that condition instead.
Coding tip
Confirm the provider names the ulnar nerve lesion and document laterality or site when available.