2026 ICD-10-CM Diagnosis Code G64Other disorders of peripheral nervous system

ICD-10-CM Codes›G00–G99›G60-G65›G64

ICD-10-CM G64
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G64 is a billable ICD-10-CM diagnosis code for other disorders of peripheral nervous system. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 73 through 74. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (neither hereditary nor degenerative).

G64 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 75 for payment year 2026.

Code Identity

ICD-10-CM Code
G64
Billable Status
Yes — Valid for Submission
Code Describes
Other disorders of peripheral nervous system
Short Description
Other disorders of peripheral nervous system
Same as the full description in the CMS dataset.
Chapter
G60-G65
Polyneuropathies and other disorders of the peripheral nervous system

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG60-G65Polyneuropathies and other disorders of the peripheral nervous system
CategoryG64Other disorders of peripheral nervous system
This CodeG64Other disorders of peripheral nervous system

Medicare Risk Adjustment (HCC)Billing

G64 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Other CMS Models
ESRD (V21): HCC 75
ESRD V21 weights: 0.059 dialysis, 0.284–0.323 functioning graft
Part D (RxHCC)
Not mapped
G64 does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired demyelinating disorder of peripheral nerve
  • Bacterial infection of peripheral nerve
  • Dermatosis secondary to peripheral nerve disorder
  • Disorder of peripheral nervous system co-occurrent with human immunodeficiency virus infection
  • Disorder of the peripheral nervous system
  • Dystonia due to disorder of peripheral nervous system
  • EMILIN-1-related connective tissue disease
  • Infection of peripheral nerve
  • Neurological dysfunction due to obstetric fistula
  • Neurotrophic damage to skin
  • Parasitic infection of peripheral nerve
  • Peripheral nerve disease
  • Peripheral nerve disorder associated with repair of hernia
  • Skin damage resulting from acquired nerve disorder
  • Viral infection of peripheral nerve

Tabular List NotesGuidance

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

Inclusion Terms

  • Disorder of peripheral nervous system NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR NVS020
Other nervous system disorders (neither hereditary nor degenerative)
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 G64 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 HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G64Overview

What is the ICD-10 code for other disorders of peripheral nervous system?

The ICD-10-CM code for other disorders of peripheral nervous system is G64. It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is G64 (Other disorders of peripheral nervous system) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other disorders of peripheral nervous system on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does G64 group to?

When other disorders of peripheral nervous system is the principal diagnosis on an inpatient stay, it groups to MS-DRG 73, 74, with relative weights from 1.0308 to 1.6043 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of G64?

Under the General Equivalence Mappings, other disorders of peripheral nervous system converts to ICD-9-CM 357.89 (inflam/tox neuropthy NEC). The mapping is approximate, so confirm the match fits the documentation.

Does G64 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: G64 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 75 (Polyneuropathy).