2026 ICD-10-CM Diagnosis Code B08.3Erythema infectiosum [fifth disease]

ICD-10-CM Codes›A00–B99›B00-B09›B08

ICD-10-CM B08.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B08.3 is a billable ICD-10-CM diagnosis code for erythema infectiosum [fifth disease]. 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 disease caused by Parvoviridae. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.

Code Identity

ICD-10-CM Code
B08.3
Billable Status
Yes — Valid for Submission
Code Describes
Erythema infectiosum [fifth disease]
Short Description
Erythema infectiosum [fifth disease]
Same as the full description in the CMS dataset.
Parent Code
B08
Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB00-B09Viral infections characterized by skin and mucous membrane lesions
CategoryB08Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified
This CodeB08.3Erythema infectiosum [fifth disease]

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Disease caused by Parvoviridae
  • Infection caused by Erythroparvovirus
  • Primate erythroparvovirus 1 infection

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.

    • Disease, diseased
      • fifth
    • Disease, diseased
      • Sticker's (erythema infectiosum)
    • Erythema, erythematous(infectional) (inflammation)
      • infectiosum
    • Fifth disease
    • Infection, infected, infective(opportunistic)
      • erythema infectiosum
    • Megalerythema(epidemic)
    • Sticker's disease

Clinical ClassificationClinical

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

CCSR INF008
Viral infection
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Erythema Infectiosum

    contagious infection with human b19 parvovirus most commonly seen in school age children and characterized by fever, headache, and rashes of the face, trunk, and extremities. it is often confused with rubella.

  • Rubella

    an acute infectious disease caused by the rubella virus. the virus enters the respiratory tract via airborne droplet and spreads to the lymphatic system.

Patient EducationClinical

Fifth Disease

Fifth disease, also called erythema infectiosum, is a viral infection caused by parvovirus B19. This virus only infects people; it's not the same type of parvovirus that dogs and cats can get.

The full article covers:

  • What is fifth disease?
  • What causes fifth disease?
  • What are the symptoms of fifth disease?
  • How is fifth disease diagnosed?
  • What are the treatments for fifth disease?
  • Can fifth disease be prevented?

Read the full article at MedlinePlus

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

Convert B08.3 to ICD-9-CMHistory

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

ICD-9-CM
057.0 Erythema infectiosum
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 B08.3Overview

Is B08.3 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report erythema infectiosum [fifth disease] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B08.3 group to?

When erythema infectiosum [fifth disease] 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 B08.3?

Under the General Equivalence Mappings, erythema infectiosum [fifth disease] converts to ICD-9-CM 057.0 (erythema infectiosum). 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.