2026 ICD-10-CM Diagnosis Code B08.22Exanthema subitum [sixth disease] due to human herpesvirus 7

ICD-10-CM Codes›A00–B99›B00-B09›B08

ICD-10-CM B08.22
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B08.22 is a billable ICD-10-CM diagnosis code for exanthema subitum [sixth disease] due to human herpesvirus 7. 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. The code is restricted by the Medicare Code Editor to pediatric patients (age 0 through 17). Coders also document this condition as exanthema subitum. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.

Code Identity

ICD-10-CM Code
B08.22
Billable Status
Yes — Valid for Submission
Code Describes
Exanthema subitum [sixth disease] due to human herpesvirus 7
Short Description
Exanthema subitum [sixth disease] due to human herpesvirus 7
Same as the full description in the CMS dataset.
Parent Code
B08.2
Exanthema subitum [sixth disease]

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 CodeB08.22Exanthema subitum [sixth disease] due to human herpesvirus 7

Code EditsBilling

Medicare Code Editor checks that affect claim validity for B08.22.

Pediatric diagnoses
The Medicare Code Editor detects inconsistencies in pediatric cases by checking a patient's age and any diagnosis on the patient's record. The pediatric code edits apply to patients age range is 0–17 years inclusive (e.g., Reye's syndrome, routine child health exam).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Exanthema subitum
  • Human herpes virus 7 infection of skin
  • Infection by human herpesvirus 7
  • Infection caused by Roseolovirus
  • Roseola infantum caused by human herpesvirus 7

Tabular List NotesGuidance

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

Inclusion Terms

  • Roseola infantum due to human herpesvirus 7

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
      • sixth
        • due to human herpesvirus 7
    • Exanthem, exanthema
      • subitum
        • due to human herpesvirus 7
    • Roseola
      • infantum
        • due to human herpesvirus 7
    • Sixth disease
      • due to human herpesvirus 7

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

  • Exanthema Subitum

    an acute, short-lived, viral disease of infants and young children characterized by a high fever at onset that drops to normal after 3-4 days and the concomitant appearance of a macular or maculopapular rash that appears first on the trunk and then spreads to other areas. it is the sixth of the classical exanthematous diseases and is caused by hhv-6; (herpesvirus 6, human). (from dorland, 27th ed)

Patient EducationClinical

Viral Infections

Viruses are very tiny germs. They are made of genetic material (either DNA or RNA) inside of a protein coating. There are a huge number of viruses on earth. Only a small number of them can infect humans. Those viruses can infect our cells, which may cause disease.

The full article covers:

  • What are viruses?
  • How are viruses spread?
  • How do viruses cause disease?
  • What are the treatments for viral infections?
  • Can viral infections be prevented?

Read the full article at MedlinePlus

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

Convert B08.22 to ICD-9-CMHistory

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

ICD-9-CM
058.12 Roseola infant d/t HHV-7
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 B08.22Overview

Is B08.22 (Exanthema subitum [sixth disease]) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report exanthema subitum [sixth disease] due to human herpesvirus 7 on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B08.22 group to?

When exanthema subitum [sixth disease] due to human herpesvirus 7 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.

Who can B08.22 be reported for?

The Medicare Code Editor checks exanthema subitum [sixth disease] due to human herpesvirus 7 against patient demographics: this code is intended for pediatric patients (age 0 through 17). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of B08.22?

Under the General Equivalence Mappings, exanthema subitum [sixth disease] due to human herpesvirus 7 converts to ICD-9-CM 058.12 (roseola infant d/t HHV-7). 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.