B27
Non-billableInfectious mononucleosis
Infectious mononucleosis
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Includes
Conditions included under this code
- diseases generally recognized as communicable or transmissible
- glandular fever
- monocytic angina
- Pfeiffer's disease
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
- certain localized infections - see body system-related chapters
Excludes 2
Conditions not included here, but the patient may have both
Use Additional Code
Additional codes that should follow this code
Child Codes (4)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(27)
UMLS
- Fever, GlandularC0021345
- GF - Glandular feverC0021345
- Gammaherpesviral mononucleosisC0021345
- Gammaherpesviral mononucleosis (disorder)C0021345
- Glandular FeverC0021345
- Glandular feverC0021345
- IM - Infectious mononucleosisC0021345
- IM - Infective mononucleosisC0021345
- INFECT MONONUCLEOSISC0021345
- Infectious MononucleosisC0021345
- Infectious mononucleosisC0021345
- Infectious mononucleosis (disorder)C0021345
- Infectious mononucleosis, unspecifiedC0021345
- Infective mononucleosisC0021345
- Kissing diseaseC0021345
- MONONUCLEOSIS INFECTC0021345
- MonoC0021345
- Monocytic anginaC0021345
- MononucleosisC0021345
- Mononucleosis infectiousC0021345
- Mononucleosis, InfectiousC0021345
- Pfeiffer's diseaseC0021345
- glandular feverC0021345
- infectious mononucleosisC0021345
- monocytic anginaC0021345
- mononucleosisC0021345
- pfeiffer's diseaseC0021345
Frequently Asked Questions
What is the ICD-10 code for infectious mononucleosis?
The ICD-10-CM code for infectious mononucleosis is B27. The full clinical description is "Infectious mononucleosis". B27 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code B27 mean?
ICD-10-CM code B27 represents “Infectious mononucleosis”. It is classified under Chapter 1: Certain Infectious and Parasitic Diseases and is a non-billable header code. Use a more specific child code for billing purposes.
Is B27 a billable code?
No, B27 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 4 child codes under B27.
What chapter is B27 in?
B27 is in Chapter 1: Certain Infectious and Parasitic Diseases (codes A00-B99).
What codes cannot be used with B27?
B27 has Excludes1 notes indicating codes that cannot be used together with it, including: certain localized infections - see body system-related chapters.
What are the subcategories under B27?
B27 has 4 child codes, including: B27.0 (Gammaherpesviral mononucleosis), B27.1 (Cytomegaloviral mononucleosis), B27.8 (Other infectious mononucleosis), B27.9 (Infectious mononucleosis, unspecified).
Are additional codes required with B27?
Yes, when using B27, also report: resistance to antimicrobial drugs (Z16.-).
What are the UMLS CUIs for B27?
B27 is linked to 1 UMLS Concept Unique Identifier: C0021345. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does B27 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like infectious mononucleosis affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of B27?
B27 maps to the ICD-11 code: 1D81.Z (Infectious mononucleosis, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.