2027 ICD-10-CM Diagnosis Code G61.0Guillain-Barre syndrome
ICD-10-CM Codes›G00–G99›G60-G65›G61
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
G61.0 is a billable ICD-10-CM diagnosis code for Guillain-Barre syndrome. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 94 through 96. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 49 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Polyneuropathies.
G61.0 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
G61.0 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.
- Acute infective polyneuritis
- Acute inflammatory demyelinating polyradiculoneuropathy
- Acute pure sensory neuropathy
- Acute sensory ataxic neuropathy
- Autoimmune disorder of autonomic nerve
- Autoimmune disorder of autonomic nervous system
- Autoimmune movement disorder
- Disorder of autonomic nerve due to Guillain-Barre Syndrome
- Fisher's syndrome
- Guillain-Barré syndrome
- Guillain-Barré syndrome caused by vaccine product containing influenza virus antigen
- Paraparetic variant of Guillain-Barré syndrome
- Pharyngeal-cervical-brachial variant of Guillain-Barré syndrome
- Polyradiculoneuropathy
- Post-infectious polyneuritis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G61.0: 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.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Acute (post-)infective polyneuritis
- Miller Fisher Syndrome
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.
Disease, diseased See Also: Syndrome;
Guillain-Barré G61.0
Landry's G61.0
Miller Fisher syndrome G61.0
multiple See Also: Polyneuropathy;
infective, acute G61.0
ascending G61.0
Ophthalmoplegia See Also: Strabismus, paralytic;
ataxia-areflexia G61.0
Polyneuritis, polyneuritic See Also: Polyneuropathy;
acute (post-)infective G61.0
febrile, acute G61.0
idiopathic, acute G61.0
infective (acute) G61.0
postinfective (acute) G61.0
Syndrome See Also: Disease;
Barré-Guillain G61.0
Fisher's G61.0
Guillain-Barré (-Strohl) G61.0
Miller-Fisher G61.0
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Guillain-Barre Syndrome
an acute inflammatory autoimmune neuritis caused by t cell- mediated cellular immune response directed towards peripheral myelin. demyelination occurs in peripheral nerves and nerve roots. the process is often preceded by a viral or bacterial infection, surgery, immunization, lymphoma, or exposure to toxins. common clinical manifestations include progressive weakness, loss of sensation, and loss of deep tendon reflexes. weakness of respiratory muscles and autonomic dysfunction may occur. (from adams et al., principles of neurology, 6th ed, pp1312-1314)
Patient EducationClinical
Guillain-Barre Syndrome
Guillain-Barre syndrome is a rare disorder that causes your immune system to attack your peripheral nervous system (PNS). The PNS nerves connect your brain and spinal cord with the rest of your body. Damage to these nerves makes it hard for them to transmit signals. As a result, your muscles have trouble responding to your brain.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G61.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G61.0Overview
What is the ICD-10 code for Guillain-Barre syndrome?
The ICD-10-CM code for Guillain-Barre syndrome is G61.0 (sometimes written as G610). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G61.0 (Inflammatory polyneuropathy) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Guillain-Barre syndrome on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G61.0 group to?
When Guillain-Barre syndrome is the principal diagnosis on an inpatient stay, it groups to MS-DRG 96, 95, 94, with relative weights from 2.3173 to 3.4110 depending on complications. Higher weights mean higher Medicare reimbursement.
Is G61.0 a CC or MCC?
CMS lists G61.0 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 49 closely related codes in its exclusion list.
Can G61.0 be reported with M79.2?
Not as a rule. The Excludes1 note at block G60-G65, which applies to G61.0, 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).
Does G61.0 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. G61.0 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).
