B27.1
B27.1 — Cytomegaloviral mononucleosis
Non-billable headerICD-10-CM
B27.1 is a non-billable header ICD-10-CM code for cytomegaloviral mononucleosis. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with B27.1
These codes carry an Excludes1 note pointing at B27.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading B27.1 alone.
- B25Cytomegaloviral disease
Risk adjustment
B27.1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead B27.1
4 child codes. Green means billable.
Related codes at this level
Codes that share B27. If B27.1 is not quite right, the correct code is usually one of these.
Questions about B27.1
- Is B27.1 a billable ICD-10-CM code?
- No. B27.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does B27.1 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Other viral diseases (B25-B34).