MCMedicalCodingSoftware
B27.00

B27.00: Gammaherpesviral mononucleosis without complication

Billable / specific codeICD-10-CM

B27.00 is a billable, specific ICD-10-CM code for gammaherpesviral mononucleosis without complication. It is valid for submission on a claim.

Check B27.00 with the rest of the claim: free scrubber

Other codes that can never be billed with B27.00

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • G02Meningitis in other infectious and parasitic diseases classified elsewhere
  • J02.8Acute pharyngitis due to other specified organisms
  • D72.821Monocytosis (symptomatic)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

B27.00 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A55639Billing and Coding: Chemotherapy Agents for Non-Oncologic Conditions
  • A56380Billing and Coding: Rituximab

Alphabetic index entries that lead here

  • Mononucleosis, infectious›Epstein-Barr(virus)
  • Mononucleosis, infectious›gammaherpesviral

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under B27.0

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.