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ICD-10-CM 2027 diagnosis code

B00Herpesviral [herpes simplex] infections

Not billable — use a more specific code

B00 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.

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

B00 is the ICD-10-CM diagnosis code for herpesviral [herpes simplex] infections. It belongs to block B00-B09 (viral infections characterized by skin and mucous membrane lesions) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: B00.0 (herpeticum), B00.1 (dermatitis), B00.2 (pharyngotonsillitis), B00.3 (meningitis), B00.4 (encephalitis), B00.5 (disease), B00.7 (disease), B00.8 (infections) and 1 more.

Don't report B00 together with the conditions in its Excludes1 note: congenital herpesviral infections (P35.2).

The conditions in its Excludes2 note aren't part of B00, but may be coded alongside it if the patient has both: anogenital herpesviral infection (A60.-), gammaherpesviral mononucleosis (B27.0-) and herpangina (B08.5).

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

Specific codes under B00

Coding notes

Excludes1Not coded here — never report together with this code
  • congenital herpesviral infections (P35.2)
Excludes2Not included here — may be reported together if both conditions exist
  • anogenital herpesviral infection (A60.-)
  • gammaherpesviral mononucleosis (B27.0-)
  • herpangina (B08.5)

Notes that apply from higher levels

Instructions written at a parent level also apply to B00.

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

Codes whose notes reference B00

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

Is B00 billable?

No. B00 is a header code. Report one of its more specific subcodes instead.