ICD-10 Code G56.8 – Other specified mononeuropathies of upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G56.8 – Other specified mononeuropathies of upper limb
What it is
Use this code for a single upper-limb nerve disorder that does not fit a more specific mononeuropathy category. It covers specified nerve involvement in the arm, forearm, wrist, or hand when documentation supports the diagnosis.
Clinical signs
Typical findings include localized numbness, tingling, pain, weakness, or reduced sensation in the distribution of one upper-extremity nerve. Clinical features vary; refer to documentation.
When to use this code
Assign G56.8 when the clinician documents a specified mononeuropathy of the upper limb and no more precise ICD-10-CM code is available. Use it when the record identifies a particular upper-extremity nerve disorder but does not name a better code.
Make sure the note supports one nerve being affected rather than a generalized peripheral neuropathy. If the documentation is vague or incomplete, check documentation before coding.
Do not use for
Do not use this code for carpal tunnel syndrome, ulnar nerve lesion, or other specifically indexed upper-limb mononeuropathies. It is also not for diffuse polyneuropathy or unspecified nerve symptoms alone.
Coding tip
Code the most specific documented upper-limb nerve disorder first; use G56.8 only when no more specific option applies.