2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 75 through 76. 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 174 closely related codes. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A88.0: its own notes plus those printed at A88, block A80-A89, and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From A88 Other viral infections of central nervous system, not elsewhere classified applies to 3 codes
  • viral encephalitis NOS (A86)
  • viral meningitis NOS (A87.9)
From Block A80-A89 Viral and prion infections of the central nervous system applies to 48 codes
  • postpolio syndrome (G14)
  • sequelae of poliomyelitis (B91)
  • sequelae of viral encephalitis (B94.1)

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.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

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.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A88.0Overview

What is the ICD-10 code for enteroviral exanthematous fever [Boston exanthem]?

The ICD-10-CM code for enteroviral exanthematous fever [Boston exanthem] is A88.0 (sometimes written as A880). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does A88.0 group to?

When enteroviral exanthematous fever [Boston exanthem] is the principal diagnosis on an inpatient stay, it groups to MS-DRG 75, 76, with relative weights from 0.8672 to 1.7699 depending on complications. Higher weights mean higher Medicare reimbursement.

Is A88.0 a CC or MCC?

CMS lists A88.0 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 174 closely related codes in its exclusion list.

Can A88.0 be reported with A86?

Not as a rule. The Excludes1 note at A88, which applies to A88.0, lists "viral encephalitis NOS (A86)". 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).