B27 ICD-10-CM Code: Infectious mononucleosis
A clear reference for the official code description, hierarchy, and related coding information from the April 2026 U.S. release.
Code definition
Official description
B27Infectious mononucleosis
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where B27 sits
- 1
Chapter 1
Certain infectious and parasitic diseases (A00-B99)
- 2
Section
Other viral diseases (B25-B34)
- 3
Category B27
Infectious mononucleosis
- 4
Code B27
Infectious mononucleosis
More specific choices
Codes under B27
B27 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for B27.
Code first
No “code first” instruction is listed for B27.
Use additional code
No “use additional code” instruction is listed for B27.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for B27.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for B27.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code B27 mean?
B27 is the April 2026 U.S. ICD-10-CM code for “Infectious mononucleosis.”
Is B27 a billable or specific ICD-10-CM code?
No. B27 has more specific child codes in the April 2026 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is B27 located in ICD-10-CM?
B27 is listed in Chapter 1, Certain infectious and parasitic diseases (A00-B99), within Other viral diseases (B25-B34) (B25–B34), under category B27, Infectious mononucleosis.
What coding notes are listed for B27?
No inclusion terms are listed for B27 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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