ICD-10-CM 2027
ICD-10 code for upper limb mononeuropathy
From the official ICD-10-CM alphabetic index entry “Mononeuropathy › upper limb”. Page updated September 29, 2026.
About coding upper limb mononeuropathy
The ICD-10-CM code for upper limb mononeuropathy is G56.9 (Unspecified mononeuropathy of upper limb). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on G56.9.
Within G56, choose G56.9 (Unspecified mononeuropathy of upper limb) only when documentation doesn't support a more specific option: carpal tunnel syndrome (G56.0), other lesions of median nerve (G56.1), lesion of ulnar nerve (G56.2), lesion of radial nerve (G56.3), Causalgia of upper limb (G56.4) and other specified mononeuropathies of upper limb (G56.8).
To report this condition, pick the subcode that matches the documentation: G56.90 (limb), G56.91 (limb), G56.92 (limb) and G56.93 (limbs).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific upper limb mononeuropathy codes (official index)
- carpal tunnel syndrome
- causalgia
- median nerve
- radial nerve
- specified site NEC G56.8 — Other specified mononeuropathies of upper limb
- ulnar nerve
Common questions about upper limb mononeuropathy ICD-10 codes
What is the ICD-10 code for upper limb mononeuropathy?
- G56.9 — Unspecified mononeuropathy of upper limb (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: G56.8.
Is G56.9 billable?
- No. G56.9 is a header code. Report one of its more specific subcodes instead.