ICD-10-CM B27: Infectious mononucleosis

ICD-10-CM Diagnosis Code (2025)

Official Description for B27

Infectious mononucleosis

Coding Notes & Guidelines for B27

Includes Notes
  • glandular fever
  • monocytic angina
  • Pfeiffer's disease
Inclusion Terms

Mononucleosis due to Epstein-Barr virus

Inclusion Terms

Hepatomegaly in gammaherpesviral mononucleosis

Inclusion Terms

Hepatomegaly in cytomegaloviral mononucleosis

Inclusion Terms

Hepatomegaly in other infectious mononucleosis

Inclusion Terms

Hepatomegaly in unspecified infectious mononucleosis

Child Codes (More Specific Codes for B27):

B27.0 - Gammaherpesviral mononucleosis B27.00 - Gammaherpesviral mononucleosis without complication B27.01 - Gammaherpesviral mononucleosis with polyneuropathy B27.02 - Gammaherpesviral mononucleosis with meningitis B27.09 - Gammaherpesviral mononucleosis with other complications B27.1 - Cytomegaloviral mononucleosis B27.10 - Cytomegaloviral mononucleosis without complications B27.11 - Cytomegaloviral mononucleosis with polyneuropathy B27.12 - Cytomegaloviral mononucleosis with meningitis B27.19 - Cytomegaloviral mononucleosis with other complication B27.8 - Other infectious mononucleosis B27.80 - Other infectious mononucleosis without complication B27.81 - Other infectious mononucleosis with polyneuropathy B27.82 - Other infectious mononucleosis with meningitis B27.89 - Other infectious mononucleosis with other complication B27.9 - Infectious mononucleosis, unspecified B27.90 - Infectious mononucleosis, unspecified without complication B27.91 - Infectious mononucleosis, unspecified with polyneuropathy B27.92 - Infectious mononucleosis, unspecified with meningitis B27.99 - Infectious mononucleosis, unspecified with other complication

About ICD-10-CM Code B27 (Infectious mononucleosis)

ICD-10-CM code B27 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM B27 became effective on October 1, 2024.

This page provides detailed information about B27 - Infectious mononucleosis. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Infectious mononucleosis.