Is C00 a billable ICD-10-CM code?

No. C00 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does C00 sit in the tabular list?

Neoplasms (C00-D49), in the block Malignant neoplasms of lip, oral cavity and pharynx (C00-C14).

What cannot be coded together with C00?

C00 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

C00

C00 — Malignant neoplasm of lip

Non-billable headerICD-10-CM

C00 is a non-billable header ICD-10-CM code for malignant neoplasm of lip. 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.

malignant melanoma of lip (C43.0)
Merkel cell carcinoma of lip (C4A.0)
other and unspecified malignant neoplasm of skin of lip (C44.0-)

Use additional code

Add a secondary code to capture the detail described below.

code to identify:
alcohol abuse and dependence (F10.-)
history of tobacco dependence (Z87.891)
tobacco dependence (F17.-)
tobacco use (Z72.0)

Other codes that can never be billed with C00

These codes carry an Excludes1 note pointing at C00. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C00 alone.

C43.0Malignant melanoma of lip
C4A.0Merkel cell carcinoma of lip
C44.0Other and unspecified malignant neoplasm of skin of lip

Risk adjustment

C00 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 C00

9 child codes. Green means billable.

Questions about C00

Is C00 a billable ICD-10-CM code?: No. C00 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does C00 sit in the tabular list?: Neoplasms (C00-D49), in the block Malignant neoplasms of lip, oral cavity and pharynx (C00-C14).
What cannot be coded together with C00?: C00 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.