ICD-10 Code G56 – Mononeuropathies of upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G56 – Mononeuropathies of upper limb
What it is
G56 identifies mononeuropathies affecting nerves in the upper limb. Use it when documentation describes a single peripheral nerve disorder in the arm, wrist, or hand, and no more specific ICD-10-CM code is provided.
Clinical signs
Typical findings include pain, numbness, tingling, weakness, or reduced sensation in a nerve distribution. Clinical features vary; refer to documentation for the exact nerve involved and any confirmed entrapment or compression.
When to use this code
Use G56 when the record states an upper-limb mononeuropathy but does not name a more specific condition such as median, ulnar, or radial nerve involvement. It also fits general nerve compression or neuropathy of the upper limb when the provider has not documented a narrower diagnosis.
Do not use for
Do not assign G56 if the documentation identifies a more specific mononeuropathy code. Do not use it for generalized polyneuropathy, plexus disorders, or symptoms alone without a confirmed diagnosis.
Coding tip
Check the note for the exact nerve and laterality, then code the most specific mononeuropathy available.