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ICD-10-CM 2027 diagnosis code

B00.1Herpesviral vesicular dermatitis

✓ Billable / specific

B00.1 is a valid, billable ICD-10-CM code for herpesviral vesicular dermatitis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About B00.1

B00.1 is the ICD-10-CM diagnosis code for herpesviral vesicular dermatitis. It belongs to category B00 (herpesviral [herpes simplex] infections), block B00-B09 (viral infections characterized by skin and mucous membrane lesions) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within B00 (herpesviral [herpes simplex] infections), B00.1 is specifically for herpesviral vesicular dermatitis. Related codes cover eczema herpeticum (B00.0), herpesviral gingivostomatitis and pharyngotonsillitis (B00.2), herpesviral meningitis (B00.3), herpesviral encephalitis (B00.4), herpesviral ocular disease (B00.5), disseminated herpesviral disease (B00.7), other forms of herpesviral infections (B00.8) and herpesviral infection, unspecified (B00.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 154 (Other Ear, Nose, Mouth and Throat Diagnoses with MCC, relative weight 1.5921), DRG 155 (Other Ear, Nose, Mouth and Throat Diagnoses with CC, relative weight 0.9322), DRG 156 (Other Ear, Nose, Mouth and Throat Diagnoses without CC/MCC, relative weight 0.6659), DRG 791 (Prematurity with Major Problems, relative weight 4.1075), DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), DRG 974 (HIV with Major Related Condition with MCC, relative weight 3.0506) and 2 more, in MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat), MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and MDC 25 (Human Immunodeficiency Virus Infections), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 054.73 (herpes simplex otitis externa).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Herpes simplex facialis
  • Herpes simplex labialis
  • Herpes simplex otitis externa
  • Vesicular dermatitis of ear
  • Vesicular dermatitis of lip

Notes that apply from higher levels

Instructions written at a parent level also apply to B00.1.

› From B00 Herpesviral [herpes simplex] infections
Excludes1
  • congenital herpesviral infections (P35.2)
Excludes2
  • anogenital herpesviral infection (A60.-)
  • gammaherpesviral mononucleosis (B27.0-)
  • herpangina (B08.5)

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

12 entries

Terms in the official ICD-10-CM index that lead to B00.1.

Codes whose notes reference B00.1

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 054.73Herpes simplex otitis externaapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about B00.1

Is B00.1 billable?

Yes. B00.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can B00.1 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict B00.1 as a principal diagnosis.

Is B00.1 a CC or MCC?

No. B00.1 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does B00.1 group to?

B00.1 is used in the MS-DRG v44.0 logic for MS-DRG 154 (Other Ear, Nose, Mouth and Throat Diagnoses with MCC), MS-DRG 155 (Other Ear, Nose, Mouth and Throat Diagnoses with CC), MS-DRG 156 (Other Ear, Nose, Mouth and Throat Diagnoses without CC/MCC), MS-DRG 791 (Prematurity with Major Problems), MS-DRG 793 (Full Term Neonate with Major Problems), MS-DRG 974 (HIV with Major Related Condition with MCC) and 2 more. Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for B00.1?

The CMS General Equivalence Mappings map B00.1 to ICD-9-CM 054.73.