All ICD10 Codes

B27

Non-Billable
ChapterA00–B99
Rankcategory
Official Description

Infectious mononucleosis

Use a more specific code (0 billable, 4 non-billable)
B27.0Gammaherpesviral mononucleosishas subcodesB27.1Cytomegaloviral mononucleosishas subcodesB27.8Other infectious mononucleosishas subcodesB27.9Infectious mononucleosis, unspecifiedhas subcodes
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here. Use a different code.)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here. Code separately if applicable.)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)
Use Additional Code
  • code to identify resistance to antimicrobial drugs (Z16.-)

Instructional Notes

Includes
  • glandular fever
  • monocytic angina
  • Pfeiffer's disease

Clinical Hierarchy

BillableHas subcodes
CH1Certain infectious and parasitic diseases (A00-B99)
B25-B34Other viral diseases (B25-B34)
B27Infectious mononucleosisNot billable
B27.0Gammaherpesviral mononucleosisSubcodes
B27.1Cytomegaloviral mononucleosisSubcodes
B27.8Other infectious mononucleosisSubcodes
B27.9Infectious mononucleosis, unspecifiedSubcodes

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to B27:

chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Infectious mononucleosis.

Search PCS Codes