B27.1
Cytomegaloviral mononucleosis
B27.1 is a non-billable ICD-10-CM code header for cytomegaloviral mononucleosis. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are B27.10 Cytomegaloviral mononucleosis without complications, B27.11 Cytomegaloviral mononucleosis with polyneuropathy, B27.12 Cytomegaloviral mononucleosis with meningitis and B27.19 Cytomegaloviral mononucleosis with other complication. Its coding notes include a Use additional code instruction and 5 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (5 notes)
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- 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)
Includes
Further defines or gives examples of the content of the category.
- glandular fever
- monocytic angina
- Pfeiffer's disease
Also from chapter/block level (1 note)
- diseases generally recognized as communicable or transmissible