Is B01 a billable ICD-10-CM code?

No. B01 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does B01 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Viral infections characterized by skin and mucous membrane lesions (B00-B09).

B01

B01 — Varicella [chickenpox]

Non-billable headerICD-10-CM

B01 is a non-billable header ICD-10-CM code for varicella [chickenpox]. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with B01

These codes carry an Excludes1 note pointing at B01. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading B01 alone.

G02Meningitis in other infectious and parasitic diseases classified elsewhere
G04.01Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
G05Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
J17Pneumonia in diseases classified elsewhere

Risk adjustment

B01 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 B01

5 child codes. Green means billable.

Questions about B01

Is B01 a billable ICD-10-CM code?: No. B01 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does B01 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Viral infections characterized by skin and mucous membrane lesions (B00-B09).