2026 ICD-10-CM Diagnosis Code A80.4Acute nonparalytic poliomyelitis

ICD-10-CM Codes›A00–B99›A80-A89›A80

ICD-10-CM A80.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A80.4 is a billable ICD-10-CM diagnosis code for acute nonparalytic poliomyelitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 865 through 866. Coders also document this condition as abortive poliomyelitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified CNS infection and poliomyelitis and Viral infection.

Code Identity

ICD-10-CM Code
A80.4
Billable Status
Yes — Valid for Submission
Code Describes
Acute nonparalytic poliomyelitis
Short Description
Acute nonparalytic poliomyelitis
Same as the full description in the CMS dataset.
Parent Code
A80
Acute poliomyelitis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA80-A89Viral and prion infections of the central nervous system
CategoryA80Acute poliomyelitis
This CodeA80.4Acute nonparalytic poliomyelitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abortive poliomyelitis
  • Acute nonparalytic poliomyelitis
  • Acute nonparalytic poliomyelitis caused by human poliovirus 1
  • Acute poliomyelitis caused by Human poliovirus 1

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.

    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • polioviral (nonparalytic)
    • Poliomyelitis(acute) (anterior) (epidemic)
      • abortive
    • Poliomyelitis(acute) (anterior) (epidemic)
      • nonparalytic

Clinical ClassificationClinical

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

CCSR NVS003
Other specified CNS infection and poliomyelitis
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF008
Viral infection
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Polio and Post-Polio Syndrome

Polio, or poliomyelitis, is a disease that spreads from person to person. It is caused by the poliovirus. The virus attacks the nervous system. In serious cases, it can cause paralysis (where you can't move parts of the body). The paralysis may be lifelong and can sometimes be life-threatening.

The full article covers:

  • What is polio?
  • How does polio spread?
  • Who is more likely to develop polio?
  • What are the symptoms of polio?
  • What is post-polio syndrome (PPS)?
  • How is polio diagnosed?
  • What are the treatments for polio and post-polio syndrome (PPS)?
  • Can polio be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A80.4 to ICD-9-CMHistory

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

ICD-9-CM
045.20 Nonparaly polio-type NOS
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A80.4Overview

Is A80.4 (Acute poliomyelitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute nonparalytic poliomyelitis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does A80.4 group to?

When acute nonparalytic poliomyelitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 865, 866, with relative weights from 0.8696 to 1.4983 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A80.4?

Under the General Equivalence Mappings, acute nonparalytic poliomyelitis converts to ICD-9-CM 045.20 (nonparaly polio-type NOS). The mapping is approximate, so confirm the match fits the documentation.

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.