Skip to content
Dx

ICD-10-CM 2027 diagnosis code

G64Other disorders of peripheral nervous system

✓ Billable / specific

G64 is a valid, billable ICD-10-CM code for other disorders of peripheral nervous system. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G64

G64 is the ICD-10-CM diagnosis code for other disorders of peripheral nervous system. It belongs to block G60-G65 (polyneuropathies and other disorders of the peripheral nervous system) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 357.89 (other inflammatory and toxic neuropathy).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Disorder of peripheral nervous system NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to G64.

Broader instructions also apply from G60-G65 Polyneuropathies and other disorders of the peripheral nervous system and Chapter 6: Diseases of the nervous system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to G64.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 357.89Other inflammatory and toxic neuropathyapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about G64

Is G64 billable?

Yes. G64 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can G64 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict G64 as a principal diagnosis.

Is G64 a CC or MCC?

No. G64 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does G64 group to?

G64 is used in the MS-DRG v44.0 logic for MS-DRG 073 (Cranial and Peripheral Nerve Disorders with MCC) and MS-DRG 074 (Cranial and Peripheral Nerve Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for G64?

The CMS General Equivalence Mappings map G64 to ICD-9-CM 357.89.