ICD-10-CM 2027
ICD-10 code for MMN
From the official ICD-10-CM alphabetic index entry “MMN (multifocal motor neuropathy)”. Page updated September 29, 2026.
About coding MMN
The ICD-10-CM code for MMN is G61.82 (Multifocal motor neuropathy).
Within G61.8 (other inflammatory polyneuropathies), G61.82 is specifically for multifocal motor neuropathy. Related codes cover chronic inflammatory demyelinating polyneuritis (G61.81) and other inflammatory polyneuropathies (G61.89).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 073 (Cranial and Peripheral Nerve Disorders with MCC, relative weight 1.5779) and DRG 074 (Cranial and Peripheral Nerve Disorders without MCC, relative weight 1.0173), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about MMN ICD-10 codes
What is the ICD-10 code for MMN?
- G61.82 — Multifocal motor neuropathy.
Is G61.82 billable?
- Yes. G61.82 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G61.82 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G61.82 as a principal diagnosis.
Is G61.82 a CC or MCC?
- No. G61.82 is neither a CC nor an MCC under MS-DRG v44.0.