Is B25 a billable ICD-10-CM code?

No. B25 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does B25 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Other viral diseases (B25-B34).

What cannot be coded together with B25?

B25 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

B25

B25 — Cytomegaloviral disease

Non-billable headerICD-10-CM

B25 is a non-billable header ICD-10-CM code for cytomegaloviral disease. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

congenital cytomegalovirus infection (P35.1)
cytomegaloviral mononucleosis (B27.1-)

Other codes that can never be billed with B25

These codes carry an Excludes1 note pointing at B25. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading B25 alone.

B34Viral infection of unspecified site
A85Other viral encephalitis, not elsewhere classified
J17Pneumonia in diseases classified elsewhere
K77Liver disorders in diseases classified elsewhere
K87Disorders of gallbladder, biliary tract and pancreas in diseases classified elsewhere

Risk adjustment

B25 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 B25

5 child codes. Green means billable.

Questions about B25

Is B25 a billable ICD-10-CM code?: No. B25 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does B25 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Other viral diseases (B25-B34).
What cannot be coded together with B25?: B25 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.