ICD-10 Code G56.92 – Unspecified mononeuropathy of left upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G56.92 – Unspecified mononeuropathy of left upper limb
What it is
This code identifies a single-nerve disorder affecting the left upper limb when the exact nerve is not documented. Use it for localized neuropathy in the arm or hand without a more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include numbness, tingling, pain, weakness, or reduced sensation in a left arm or hand nerve distribution.
When to use this code
Use G56.92 when the record supports mononeuropathy of the left upper limb but does not name the specific nerve involved. It is appropriate when the provider documents neuropathy, nerve palsy, or entrapment on the left side without further detail. If laterality or nerve site is specified, choose a more exact code.
Do not use for
Do not use this code for generalized peripheral neuropathy, cervical radiculopathy, or bilateral upper-limb involvement. Check documentation if the condition is better described by a specific nerve lesion or another neurologic diagnosis.
Coding tip
Code the most specific mononeuropathy documented; if the nerve is named, do not default to this unspecified code.