ICD-10 Code G61.82 – Multifocal motor neuropathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G61.82 – Multifocal motor neuropathy
What it is
G61.82 identifies multifocal motor neuropathy, a rare peripheral nerve disorder that causes progressive weakness, usually in the arms. It is a motor-predominant neuropathy, so sensory loss is typically minimal or absent.
Clinical signs
Common findings include asymmetric distal weakness, muscle wasting, and reduced reflexes in affected muscles. Clinical features vary; refer to documentation, but conduction block on nerve studies is often noted.
When to use this code
Use G61.82 when the provider documents multifocal motor neuropathy or clearly identifies this specific diagnosis. It may also apply when the record supports a motor neuropathy with multifocal distribution and no better alternative code is documented.
If the note only says peripheral neuropathy, weakness, or neuropathy NOS, do not assume this code. Check documentation for the exact diagnosis and whether the condition is confirmed or suspected.
Do not use for
Do not use this code for generalized polyneuropathy, sensory neuropathies, or neuropathy due to another known cause unless multifocal motor neuropathy is specifically documented. Check documentation if the diagnosis is uncertain.
Coding tip
Confirm the provider’s exact wording and any nerve-conduction findings before assigning G61.82.