B27.1
⚠ Non-billable
Cytomegaloviral mononucleosis
ICD-10-CM · FY2026 · Certain Infectious and Parasitic Diseases
Code
B27.1
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Certain Infectious and Parasitic Diseases
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code B27.1?
ICD-10-CM code B27.1 represents Cytomegaloviral mononucleosis. It is a non-billable header code requiring a more specific subcategory in the Certain Infectious and Parasitic Diseases chapter, effective October 1, 2025 – September 30, 2026.
Is B27.1 billable?
No. B27.1 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is B27.1 in?
B27.1 belongs to the Certain Infectious and Parasitic Diseases chapter (A00–B99) of ICD-10-CM.
Related codes in the B27 category
B27
Infectious mononucleosis
Non-billable
B27.0
Gammaherpesviral mononucleosis
Non-billable
B27.8
Other infectious mononucleosis
Non-billable
B27.9
Infectious mononucleosis, unspecified
Non-billable
B27.00
Gammaherpesviral mononucleosis without complication
Billable
B27.01
Gammaherpesviral mononucleosis with polyneuropathy
Billable
B27.02
Gammaherpesviral mononucleosis with meningitis
Billable
B27.09
Gammaherpesviral mononucleosis with other complications
Billable
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