2026 ICD-10-CM Diagnosis Code B08.010Cowpox

ICD-10-CM Codes›A00–B99›B00-B09›B08

ICD-10-CM B08.010
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B08.010 is a billable ICD-10-CM diagnosis code for cowpox. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.

Code Identity

ICD-10-CM Code
B08.010
Billable Status
Yes — Valid for Submission
Code Describes
Cowpox
Short Description
Cowpox
Same as the full description in the CMS dataset.
Parent Code
B08.01
Cowpox and vaccinia not from vaccine

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 CodeB08.010Cowpox

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cowpox
  • Cowpox and paravaccinia

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.

    • Cowpox

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

  • Cowpox

    a mild, eruptive skin disease of milk cows caused by cowpox virus, with lesions occurring principally on the udder and teats. human infection may occur while milking an infected animal.

  • Cowpox virus

    a species of orthopoxvirus that is the etiologic agent of cowpox. it is closely related to but antigenically different from vaccinia virus.

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 B08.010 to ICD-9-CMHistory

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

ICD-9-CM
051.01 Cowpox
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 B08.010Overview

Is B08.010 (Cowpox and vaccinia not from vaccine) a billable code?

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

What MS-DRG does B08.010 group to?

When cowpox 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 B08.010?

Under the General Equivalence Mappings, cowpox converts to ICD-9-CM 051.01 (cowpox). 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.