2026 ICD-10-CM Diagnosis Code D01.0Carcinoma in situ of colon
ICD-10-CM Codes›C00–D49›D00-D09›D01
- Billable — Valid for Submission
- Chronic Condition
D01.0 is a billable ICD-10-CM diagnosis code for carcinoma in situ of colon. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 374 through 376. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal cancers - colorectal.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Carcinoma in situ of appendix
- Carcinoma in situ of ascending colon
- Carcinoma in situ of cecum
- Carcinoma in situ of colon
- Carcinoma in situ of descending colon
- Carcinoma in situ of hepatic flexure of colon
- Carcinoma in situ of large intestine
- Carcinoma in situ of sigmoid colon
- Carcinoma in situ of splenic flexure
- Carcinoma in situ of transverse colon
- Neoplasm of hepatic flexure of colon
- Neoplasm of splenic flexure of colon
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- carcinoma in situ of rectosigmoid junction D01.1
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Appendiceal Neoplasms
tumors or cancer of the appendix.Appendix
a worm-like blind tube extension from the cecum.Colon
the segment of large intestine between the cecum and the rectum. it includes the ascending colon; the transverse colon; the descending colon; and the sigmoid colon.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| appendix | C18.1 | C78.5 | D01.0 | D12.1 | D37.3 | D49.0 |
| caput coli | C18.0 | C78.5 | D01.0 | D12.0 | D37.4 | D49.0 |
| cecum | C18.0 | C78.5 | D01.0 | D12.0 | D37.4 | D49.0 |
| hepatic [See Also: Index to disease, by histology] › flexure (colon) | C18.3 | C78.5 | D01.0 | D12.3 | D37.4 | D49.0 |
| ileocecum, ileocecal (coil) (junction) (valve) | C18.0 | C78.5 | D01.0 | D12.0 | D37.4 | D49.0 |
| intestine, intestinal › large | C18.9 | C78.5 | D01.0 | D12.6 | D37.4 | D49.0 |
| intestine, intestinal › large › appendix | C18.1 | C78.5 | D01.0 | D12.1 | D37.3 | D49.0 |
| intestine, intestinal › large › caput coli | C18.0 | C78.5 | D01.0 | D12.0 | D37.4 | D49.0 |
| intestine, intestinal › large › cecum | C18.0 | C78.5 | D01.0 | D12.0 | D37.4 | D49.0 |
| intestine, intestinal › large › colon | C18.9 | C78.5 | D01.0 | D12.6 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › ascending | C18.2 | C78.5 | D01.0 | D12.2 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › caput | C18.0 | C78.5 | D01.0 | D12.0 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › descending | C18.6 | C78.5 | D01.0 | D12.4 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › distal | C18.6 | C78.5 | D01.0 | D12.4 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › left | C18.6 | C78.5 | D01.0 | D12.4 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › pelvic | C18.7 | C78.5 | D01.0 | D12.5 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › right | C18.2 | C78.5 | D01.0 | D12.2 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › sigmoid (flexure) | C18.7 | C78.5 | D01.0 | D12.5 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › transverse | C18.4 | C78.5 | D01.0 | D12.3 | D37.4 | D49.0 |
| intestine, intestinal › large › hepatic flexure | C18.3 | C78.5 | D01.0 | D12.3 | D37.4 | D49.0 |
| intestine, intestinal › large › ileocecum, ileocecal (coil) (valve) | C18.0 | C78.5 | D01.0 | D12.0 | D37.4 | D49.0 |
| intestine, intestinal › large › sigmoid flexure (lower) (upper) | C18.7 | C78.5 | D01.0 | D12.5 | D37.4 | D49.0 |
| intestine, intestinal › large › splenic flexure | C18.5 | C78.5 | D01.0 | D12.3 | D37.4 | D49.0 |
| junction › ileocecal | C18.0 | C78.5 | D01.0 | D12.0 | D37.4 | D49.0 |
| sigmoid flexure (lower) (upper) | C18.7 | C78.5 | D01.0 | D12.5 | D37.4 | D49.0 |
| spleen, splenic NEC › flexure (colon) | C18.5 | C78.5 | D01.0 | D12.3 | D37.4 | D49.0 |
Patient EducationClinical
Colorectal Cancer
Colorectal cancer is cancer that develops in the tissues of the colon or rectum. Your colon and rectum are part of your digestive system:
The full article covers:
- What is colorectal cancer?
- What causes colorectal cancer?
- Who is more likely to develop colorectal cancer?
- What are the symptoms of colorectal cancer?
- What is screening for colorectal cancer and who needs it?
- How is colorectal cancer diagnosed?
- What are the treatments for colorectal cancer?
- Can colorectal cancer be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D01.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D01.0Overview
Is D01.0 (Carcinoma in situ of other and unspecified digestive organs) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report carcinoma in situ of colon on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D01.0 group to?
When carcinoma in situ of colon is the principal diagnosis on an inpatient stay, it groups to MS-DRG 374, 375, 376, with relative weights from 0.9243 to 2.1387 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of D01.0?
Under the General Equivalence Mappings, carcinoma in situ of colon converts to ICD-9-CM 230.3 (ca in situ colon). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
