2026 ICD-10-CM Diagnosis Code G61.0Guillain-Barre syndrome

ICD-10-CM Codes›G00–G99›G60-G65›G61

ICD-10-CM G61.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G61.0 is a billable ICD-10-CM diagnosis code for Guillain-Barre syndrome. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Polyneuropathies.

Code Identity

ICD-10-CM Code
G61.0
Billable Status
Yes — Valid for Submission
Code Describes
Guillain-Barre syndrome
Short Description
Guillain-Barre syndrome
Same as the full description in the CMS dataset.
Parent Code
G61
Inflammatory polyneuropathy

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG60-G65Polyneuropathies and other disorders of the peripheral nervous system
CategoryG61Inflammatory polyneuropathy
This CodeG61.0Guillain-Barre syndrome

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
  • Paraparetic variant of Guillain-Barré syndrome
  • Pharyngeal-cervical-brachial variant of Guillain-Barré syndrome
  • Polyradiculoneuropathy
  • Post-infectious polyneuritis

Tabular List NotesGuidance

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

Inclusion Terms

  • Acute (post-)infective polyneuritis
  • Miller Fisher Syndrome

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Barré-Guillain disease or syndrome
    • Disease, diseased
      • Guillain-Barré
    • Disease, diseased
      • Landry's
    • Encephalomyeloradiculitis(acute)
    • Encephalomyeloradiculoneuritis(acute) (Guillain-Barré)
    • Guillain-Barré disease or syndrome
    • Landry-Guillain-Barré, syndrome or paralysis
    • Landry's disease or paralysis
    • Miller Fisher syndrome
    • Neuritis(rheumatoid)
      • infectious (multiple) NEC
    • Neuritis(rheumatoid)
      • multiple
        • infective, acute
    • Neuromyelitis
      • ascending
    • Ophthalmoplegia
      • ataxia-areflexia
    • Paralysis, paralytic(complete) (incomplete)
      • ascending (spinal), acute
    • Paralysis, paralytic(complete) (incomplete)
      • Landry's
    • Paralysis, paralytic(complete) (incomplete)
      • spinal (cord)
        • ascending acute
    • Polyneuritis, polyneuritic
      • acute (post-)infective
    • Polyneuritis, polyneuritic
      • febrile, acute
    • Polyneuritis, polyneuritic
      • idiopathic, acute
    • Polyneuritis, polyneuritic
      • infective (acute)
    • Polyneuritis, polyneuritic
      • postinfective (acute)
    • Polyradiculoneuropathy(acute) (postinfective) (segmentally demyelinating)
    • Sclerosis, sclerotic
      • spinal (cord) (progressive)
        • ascending
    • Syndrome
      • Barré-Guillain
    • Syndrome
      • Fisher's
    • Syndrome
      • Guillain-Barré (-Strohl)
    • Syndrome
      • Miller-Fisher

Clinical ClassificationClinical

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

CCSR NVS015
Polyneuropathies
Default principal diagnosis: inpatient Yes · outpatient Yes

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)

  • Polyradiculoneuropathy

    diseases characterized by injury or dysfunction involving multiple peripheral nerves and nerve roots. the process may primarily affect myelin or nerve axons. two of the more common demyelinating forms are acute inflammatory polyradiculopathy (guillain-barre syndrome) and polyradiculoneuropathy, chronic inflammatory demyelinating. polyradiculoneuritis refers to inflammation of multiple peripheral nerves and spinal nerve roots.

  • Polyradiculoneuropathy, Chronic Inflammatory Demyelinating

    a slowly progressive autoimmune demyelinating disease of peripheral nerves and nerve roots. clinical manifestations include weakness and sensory loss in the extremities and enlargement of peripheral nerves. the course may be relapsing-remitting or demonstrate a step-wise progression. protein is usually elevated in the spinal fluid and cranial nerves are typically spared. guillain-barre syndrome features a relatively rapid progression of disease which distinguishes it from this condition. (adams et al., principles of neurology, 6th ed, p1337)

  • Acute Infective Polyneuritis

    an acute inflammatory process affecting the peripheral nervous system and nerve roots. it results in demyelination. it is often caused by an acute viral or bacterial infection.

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.

ICD-9-CM
357.0 Ac infect polyneuritis
Exact Match The mapping is direct, with no qualifiers.

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 G61.0Overview

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, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G61.0?

Under the General Equivalence Mappings, Guillain-Barre syndrome converts to ICD-9-CM 357.0 (ac infect polyneuritis). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.