Is D01.1 a billable ICD-10-CM code?

Yes. D01.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does D01.1 sit in the tabular list?

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

What cannot be coded together with D01.1?

D01.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above D01.1 (D01) and apply to it just the same.

D01.1

D01.1 — Carcinoma in situ of rectosigmoid junction

Billable / specific codeICD-10-CM

D01.1 is a billable, specific ICD-10-CM code for carcinoma in situ of rectosigmoid junction. It is valid for submission on a claim.

Excludes1 inherited from the categories above D01.1

These are not written on D01.1, but they bind it: a note on a category applies to every code beneath it. Billing D01.1 with anything listed here is a denial.

Written on D01 — Carcinoma in situ of other and unspecified digestive organs

melanoma in situ (D03.-)

Other codes that can never be billed with D01.1

These codes carry an Excludes1 note pointing at D01.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D01.1 alone.

D01.0Carcinoma in situ of colon

Risk adjustment

D01.1 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.

Medicare coverage

D01.1 is named in 23 Medicare coverage policies — 23 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52480Oral Antiemetic Drugs (Replacement for Intravenous Antiemetics) - Policy Article
A54768Billing and Coding: Cardiac Blood Pool Imaging (Multiple Gated Acquisition Scanning- MUGA, Ventriculography) When Performed in Conjunction with Cardiotoxic Chemotherapy
A55937Billing and Coding: Diagnostic Colonoscopy
A56394Billing and Coding: Colonoscopy and Sigmoidoscopy-Diagnostic

Code history

D01.1 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share D01. If D01.1 is not quite right, the correct code is usually one of these.

Questions about D01.1

Is D01.1 a billable ICD-10-CM code?: Yes. D01.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does D01.1 sit in the tabular list?: Neoplasms (C00-D49), in the block In situ neoplasms (D00-D09).
What cannot be coded together with D01.1?: D01.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above D01.1 (D01) and apply to it just the same.