Is D00 a billable ICD-10-CM code?

No. D00 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does D00 sit in the tabular list?

Neoplasms (C00-D49), in the block In situ neoplasms (D00-D09).

What cannot be coded together with D00?

D00 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

D00

D00 — Carcinoma in situ of oral cavity, esophagus and stomach

Non-billable headerICD-10-CM

D00 is a non-billable header ICD-10-CM code for carcinoma in situ of oral cavity, esophagus and stomach. 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.

melanoma in situ (D03.-)

Other codes that can never be billed with D00

These codes carry an Excludes1 note pointing at D00. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D00 alone.

D02.0Carcinoma in situ of larynx
K13.2Leukoplakia and other disturbances of oral epithelium, including tongue

Risk adjustment

D00 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 D00

3 child codes. Green means billable.

Questions about D00

Is D00 a billable ICD-10-CM code?: No. D00 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does D00 sit in the tabular list?: Neoplasms (C00-D49), in the block In situ neoplasms (D00-D09).
What cannot be coded together with D00?: D00 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.