2026 ICD-10-CM Diagnosis Code G61.82Multifocal motor neuropathy

ICD-10-CM Codes›G00–G99›G60-G65›G61

ICD-10-CM G61.82
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G61.82 is a billable ICD-10-CM diagnosis code for multifocal motor neuropathy. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as motor neuropathy with multiple conduction block. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Polyneuropathies.

Code Identity

ICD-10-CM Code
G61.82
Billable Status
Yes — Valid for Submission
Code Describes
Multifocal motor neuropathy
Short Description
Multifocal motor neuropathy
Same as the full description in the CMS dataset.
Parent Code
G61.8
Other inflammatory polyneuropathies

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG60-G65Polyneuropathies and other disorders of the peripheral nervous system
CategoryG61Inflammatory polyneuropathy
This CodeG61.82Multifocal motor neuropathy

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Motor neuropathy with multiple conduction block

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • MMN

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • MMN(multifocal motor neuropathy)
    • Neuropathy, neuropathic
      • multifocal motor (MMN)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS015
Polyneuropathies
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Peripheral Nerve Disorders

Nerves are like wires that carry messages back and forth between your brain and your body. Your peripheral nerves branch off from your brain and spinal cord and connect to all parts of your body, including your muscles and organs.

The full article covers:

  • What are peripheral nerves?
  • What are peripheral nerve disorders?
  • What causes peripheral nerve disorders?
  • What are the symptoms of peripheral nerve disorders?
  • How are peripheral nerve disorders diagnosed?
  • What are the treatments for peripheral nerve disorders?
  • Can peripheral nerve disorders be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G61.82 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
357.89 Inflam/tox neuropthy NEC
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement G61.82 replaces the following previously assigned code(s):

  • G61.89 - Other inflammatory polyneuropathies
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G61.82Overview

Is G61.82 (Other inflammatory polyneuropathies) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report multifocal motor neuropathy on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G61.82?

Under the General Equivalence Mappings, multifocal motor neuropathy converts to ICD-9-CM 357.89 (inflam/tox neuropthy NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.