2027 ICD-10-CM Diagnosis Code G65.1Sequelae of other inflammatory polyneuropathy

ICD-10-CM Codes›G00–G99›G60-G65›G65

ICD-10-CM G65.1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G65.1 is a billable ICD-10-CM diagnosis code for sequelae of other inflammatory polyneuropathy. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 73 through 74. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sequela of specified nervous system conditions.

G65.1 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 75 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 75, ESRD (V21) category 75, ESRD (V24) category 75, and RxHCC Part D (V08) category 158 for payment year 2027.

Code Identity

ICD-10-CM Code
G65.1
Billable Status
Yes — Valid for Submission
Code Describes
Sequelae of other inflammatory polyneuropathy
Short Description
Sequelae of other inflammatory polyneuropathy
Same as the full description in the CMS dataset.
Parent Code
G65
Sequelae of inflammatory and toxic polyneuropathies

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG60-G65Polyneuropathies and other disorders of the peripheral nervous system
CategoryG65Sequelae of inflammatory and toxic polyneuropathies
This CodeG65.1Sequelae of other inflammatory polyneuropathy

Medicare Risk Adjustment (HCC)Billing

G65.1 no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
Dropped in V28 see all codes that no longer risk-adjust
Prior Model (CMS-HCC V24)
HCC 75
V24 retired last contributed to a Medicare Advantage risk score in payment year 2025
Other CMS Models
PACE (CMS-HCC V22): HCC 75 · ESRD (V21): HCC 75 · ESRD (V24): HCC 75
ESRD V21 weights: 0.059 dialysis, 0.284–0.323 functioning graft · ESRD V24 weights: 0.074 dialysis, 0.344–0.599 functioning graft
Part D (RxHCC)
RxHCC 158 — Inflammatory and Toxic Neuropathy
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2027 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.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G65.1: its own notes plus those printed at G65, block G60-G65, and Chapter 6. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block G60-G65 Polyneuropathies and other disorders of the peripheral nervous system applies to 24 codes

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Code First

The underlying condition named in the note is sequenced before this code.

From G65 Sequelae of inflammatory and toxic polyneuropathies applies to 3 codes
  • condition resulting from (sequela) of inflammatory and toxic polyneuropathies

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

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 NVS022
Sequela of specified nervous system conditions
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 G65.1 to ICD-9-CMHistory

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

ICD-9-CM
357.4 Neuropathy in other dis
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G65.1Overview

What is the ICD-10 code for sequelae of other inflammatory polyneuropathy?

The ICD-10-CM code for sequelae of other inflammatory polyneuropathy is G65.1 (sometimes written as G651). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is G65.1 (Sequelae of inflammatory and toxic polyneuropathies) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report sequelae of other inflammatory polyneuropathy on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does G65.1 group to?

When sequelae of other inflammatory polyneuropathy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 74, 73, with relative weights from 1.0172 to 1.5773 depending on complications. Higher weights mean higher Medicare reimbursement.

Can G65.1 be reported with M79.2?

Not as a rule. The Excludes1 note at block G60-G65, which applies to G65.1, lists "neuralgia NOS (M79.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is coded first with G65.1?

The Code First note at G65, which applies to G65.1, reads: condition resulting from (sequela) of inflammatory and toxic polyneuropathies. When one of these applies, it is sequenced before G65.1.

Does G65.1 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage. G65.1 mapped to HCC 75 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 75 (Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy), ESRD (V21) category 75 (Polyneuropathy), ESRD (V24) category 75 (Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy), and RxHCC Part D (V08) category 158 (Inflammatory and Toxic Neuropathy).