ICD-10 Code G56.80 – Other specified mononeuropathies of unspecified upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G56.80 – Other specified mononeuropathies of unspecified upper limb
What it is
This code identifies a single-nerve disorder in an upper limb when the provider specifies the mononeuropathy but does not name a more specific ICD-10 category. Use it for upper-extremity nerve involvement that is not otherwise classified.
Clinical signs
Clinical features vary; refer to documentation. Typical findings in mononeuropathy include localized numbness, tingling, pain, weakness, or reduced function in the affected nerve distribution.
When to use this code
Use G56.80 when the record documents an upper-limb mononeuropathy and the note does not support a more specific site or named nerve code. It may fit cases described as “other specified” nerve entrapment or neuropathy of an unspecified upper limb. Check documentation for laterality and exact nerve involvement before coding.
Do not use for
Do not use this code for generalized polyneuropathy, radiculopathy, or carpal tunnel syndrome unless the documentation clearly supports this diagnosis instead. If the nerve, side, or condition is specified elsewhere in the chart, choose the more precise code.
Coding tip
Look for the exact nerve and laterality in the provider note; if they are missing, you may need to query or code the unspecified option only when supported.