2026 ICD-10-CM Diagnosis Code D01.3Carcinoma in situ of anus and anal canal
ICD-10-CM Codes›C00–D49›D00-D09›D01
- Billable — Valid for Submission
- Chronic Condition
D01.3 is a billable ICD-10-CM diagnosis code for carcinoma in situ of anus and anal canal. 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 - anus.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anal intraepithelial neoplasia
- Bowenoid papulosis
- Bowenoid papulosis of anus
- Carcinoma in situ of anal canal
- Carcinoma in situ of anus
- Carcinoma in situ of perianal skin
- Intraepithelial neoplasia due to human papillomavirus
- Intraepithelial squamous cell carcinoma of anogenital region
- Squamous cell carcinoma in situ of skin of perianal area
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Anal intraepithelial neoplasia III AIN III
- Severe dysplasia of anus
Type 1 Excludes
- anal intraepithelial neoplasia I and II AIN I and AIN II K62.82
- carcinoma in situ of anal margin D04.5
- carcinoma in situ of anal skin D04.5
- carcinoma in situ of perianal skin D04.5
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Dysplasia - See Also: Anomaly;
- anus (histologically confirmed) (mild) (moderate) - K62.82
- severe - D01.3
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Dysplasia
- anus (histologically confirmed) (mild) (moderate)
- severe
- Neoplasia
- intraepithelial (histologically confirmed)
- anal (AIN) (histologically confirmed)
- severe
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Bowenoid Papulosis
dysplastic papular lesions presenting on the genitalia of either sex. the lesions are associated with human papillomavirus infection. the majority of cases have a benign clinical course, although, a small number of cases with malignant transformation have been reported.Penile Bowenoid Papulosis
a cutaneous, usually multifocal lesion in the penis characterized by the presence of verrucous papules. it is caused by human papillomavirus infection. morphologically there is bowenoid dysplasia present. progression to invasive carcinoma is infrequent.
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. |
|---|---|---|---|---|---|---|
| anorectum, anorectal (junction) | C21.8 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| anus, anal | C21.0 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| anus, anal › canal | C21.1 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| anus, anal › cloacogenic zone | C21.2 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| anus, anal › sphincter | C21.1 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| canal | C21.1 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| canal › anal | C21.1 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| cloacogenic zone | C21.2 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| crypt of Morgagni | C21.8 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| hemorrhoidal zone | C21.1 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| junction | C21.8 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| junction › anorectal | C21.8 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| sphincter | C21.1 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
| sphincter › anal | C21.1 | C78.5 | D01.3 | D12.9 | D37.8 | D49.0 |
Patient EducationClinical
Anal Cancer
Your anus is the opening at the end of your large intestine. It is where stool (poop) leaves your body. The anus is formed partly from your outer layers of skin and partly from your intestine. Anal cancer is a type of cancer that forms in the tissues of your anus.
The full article covers:
- What is anal cancer?
- Who is more likely to develop anal cancer?
- What are the symptoms of anal cancer?
- How is anal cancer diagnosed?
- What are the treatments for anal cancer?
- Can anal cancer be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D01.3 to ICD-9-CMHistory
Code HistoryHistory
Questions About D01.3Overview
Is D01.3 (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 anus and anal canal on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D01.3 group to?
When carcinoma in situ of anus and anal canal 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 D01.3?
Under the General Equivalence Mappings, carcinoma in situ of anus and anal canal converts to ICD-9-CM 230.5 (ca in situ anal canal) and 230.6 (ca in situ anus NOS). The mapping is approximate, so confirm the match fits the documentation.
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.
