2027 ICD-10-CM Diagnosis Code G61.9Inflammatory polyneuropathy, unspecified
ICD-10-CM Codes›G00–G99›G60-G65›G61
- Billable — Valid for Submission
- Chronic Condition
G61.9 is a billable ICD-10-CM diagnosis code for inflammatory polyneuropathy, unspecified. 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. Coders also document this condition as polyneuritis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Polyneuropathies.
G61.9 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
Code Classification
Medicare Risk Adjustment (HCC)Billing
G61.9 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.
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.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Polyneuritis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G61.9: its own notes plus those printed at 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.
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.
- 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)
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.
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 G61.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G61.9Overview
What is the ICD-10 code for inflammatory polyneuropathy, unspecified?
The ICD-10-CM code for inflammatory polyneuropathy, unspecified is G61.9 (sometimes written as G619). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G61.9 (Inflammatory polyneuropathy) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report inflammatory polyneuropathy, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G61.9 group to?
When inflammatory polyneuropathy, unspecified 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 G61.9 be reported with M79.2?
Not as a rule. The Excludes1 note at block G60-G65, which applies to G61.9, 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 the ICD-9 equivalent of G61.9?
Under the General Equivalence Mappings, inflammatory polyneuropathy, unspecified converts to ICD-9-CM 357.9 (inflam/tox neuropthy NOS). The mapping is approximate, so confirm the match fits the documentation.
Does G61.9 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. G61.9 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).
