2026 ICD-10-CM Diagnosis Code B00.1Herpesviral vesicular dermatitis

ICD-10-CM Codes›A00–B99›B00-B09›B00

ICD-10-CM B00.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B00.1 is a billable ICD-10-CM diagnosis code for herpesviral vesicular dermatitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 154 through 156, 974 through 976. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified skin disorders and Viral infection.

Code Identity

ICD-10-CM Code
B00.1
Billable Status
Yes — Valid for Submission
Code Describes
Herpesviral vesicular dermatitis
Short Description
Herpesviral vesicular dermatitis
Same as the full description in the CMS dataset.
Parent Code
B00
Herpesviral [herpes simplex] infections

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB00-B09Viral infections characterized by skin and mucous membrane lesions
CategoryB00Herpesviral [herpes simplex] infections
This CodeB00.1Herpesviral vesicular dermatitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral herpes simplex otitis externa
  • Herpes barbae
  • Herpes labialis
  • Herpes simplex otitis externa
  • Herpesviral vesicular dermatitis
  • Infective otitis externa of bilateral ears
  • Left herpes simplex otitis externa
  • Oral herpes simplex infection
  • Oral mucosal herpes
  • Oral mucosal viral disease
  • Primary herpes simplex
  • Primary herpes simplex infection of lips
  • Primary oral herpes simplex infection
  • Recurrent herpes simplex labialis
  • Recurrent oral herpes simplex infection
  • Recurrent otitis externa of bilateral external auditory canals caused by human herpes simplex virus
  • Recurrent otitis externa of left external auditory canal caused by human herpes simplex virus
  • Recurrent otitis externa of right external auditory canal caused by human herpes simplex virus
  • Recurrent skin infection
  • Recurrent vesicular dermatitis caused by human herpes simplex virus
  • Right herpes simplex otitis externa

Tabular List NotesGuidance

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

Inclusion Terms

  • Herpes simplex facialis
  • Herpes simplex labialis
  • Herpes simplex otitis externa
  • Vesicular dermatitis of ear
  • Vesicular dermatitis of lip

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.

    • Blister(nonthermal)
      • fever
    • Coldsore
    • Dermatitis(eczematous)
      • herpesviral, vesicular (ear) (lip)
    • Dermatitis(eczematous)
      • vesicular, herpesviral
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • blister
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • sore
    • Herpes, herpesvirus, herpetic
      • facialis
    • Herpes, herpesvirus, herpetic
      • febrilis
    • Herpes, herpesvirus, herpetic
      • labialis
    • Herpes, herpesvirus, herpetic
      • lip
    • Herpes, herpesvirus, herpetic
      • simplex
        • external ear
    • Otitis(acute)
      • externa
        • in (due to)
          • herpes (simplex) virus infection

Clinical ClassificationClinical

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

CCSR SKN007
Other specified and unspecified skin disorders
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF008
Viral infection
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Herpes Labialis

    herpes simplex, caused by type 1 virus, primarily spread by oral secretions and usually occurring as a concomitant of fever. it may also develop in the absence of fever or prior illness. it commonly involves the facial region, especially the lips and the nares. (dorland, 27th ed.)

  • Simplexvirus

    a genus of the family herpesviridae, subfamily alphaherpesvirinae, consisting of herpes simplex-like viruses. the type species is herpesvirus 1, human.

Patient EducationClinical

Herpes Simplex

Herpes is an infection that is caused by a herpes simplex virus (HSV). Oral herpes causes cold sores around the mouth or face. Genital herpes affects the genitals, buttocks or anal area. Genital herpes is a sexually transmitted infection (STI). It affects the genitals, buttocks or anal area.

Read the full article at MedlinePlus

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

Convert B00.1 to ICD-9-CMHistory

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

ICD-9-CM
054.73 H simplex otitis externa
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 B00.1Overview

Is B00.1 (Herpesviral [herpes simplex] infections) a billable code?

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

What MS-DRG does B00.1 group to?

When herpesviral vesicular dermatitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 154, 155, 156, 974, 975, 976, with relative weights from 0.6911 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B00.1?

Under the General Equivalence Mappings, herpesviral vesicular dermatitis converts to ICD-9-CM 054.73 (h simplex otitis externa). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.