2026 ICD-10-CM Diagnosis Code A88.0Enteroviral exanthematous fever [Boston exanthem]

ICD-10-CM Codes›A00–B99›A80-A89›A88

ICD-10-CM A88.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A88.0 is a billable ICD-10-CM diagnosis code for enteroviral exanthematous fever [Boston exanthem]. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as enteroviral exanthem. 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
A88.0
Billable Status
Yes — Valid for Submission
Code Describes
Enteroviral exanthematous fever [Boston exanthem]
Short Description
Enteroviral exanthematous fever [Boston exanthem]
Same as the full description in the CMS dataset.
Parent Code
A88
Other viral infections of central nervous system, not elsewhere classified

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA80-A89Viral and prion infections of the central nervous system
CategoryA88Other viral infections of central nervous system, not elsewhere classified
This CodeA88.0Enteroviral exanthematous fever [Boston exanthem]

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Enteroviral exanthem
  • Enteroviral exanthematous fever

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.

    • Boston exanthem
    • Exanthem, exanthema
      • Boston
    • Exanthem, exanthema
      • epidemic with meningitis
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • enteroviral exanthematous (Boston exanthem)

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

Neurologic Diseases

The brain, spinal cord, and nerves make up the nervous system. Together they control all the workings of the body. When something goes wrong with a part of your nervous system, you can have trouble moving, speaking, swallowing, breathing, or learning. You can also have problems with your memory, senses, or mood.

Read the full article at MedlinePlus

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

Convert A88.0 to ICD-9-CMHistory

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

ICD-9-CM
048 Oth enteroviral cns 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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A88.0Overview

Is A88.0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report enteroviral exanthematous fever [Boston exanthem] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of A88.0?

Under the General Equivalence Mappings, enteroviral exanthematous fever [Boston exanthem] converts to ICD-9-CM 048 (oth enteroviral cns dis). 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.