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D01.3

✓ Billable

Carcinoma in situ of anus and anal canal

Neoplasms (C00-D49)

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Also Known As

Anal intraepithelial neoplasia III [AIN III]Severe dysplasia of anus

❌ Excludes1

direct

These codes are mutually exclusive. Never code them together.

  • • 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)

❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

D01
  • • melanoma in situ (D03.-)

Clinical Description

ICD-10-CM code D01.3 represents carcinoma in situ of anus and anal canal. This code falls under the Neoplasms (C00-D49) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.

This is a 5-character code at the 4th level of specificity. This is the most specific code available in this subcategory. Coders should note that D01.3 has 5 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code D01.3?

ICD-10-CM code D01.3 is "Carcinoma in situ of anus and anal canal". It belongs to the category: Neoplasms (C00-D49).

Is D01.3 a billable ICD-10 code?

Yes, D01.3 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

What codes are excluded with D01.3?

D01.3 has 5 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Related Codes in D01

Other codes in the same category that may be relevant for differential coding:

D01.0Carcinoma in situ of colonD01.1Carcinoma in situ of rectosigmoid junctionD01.2Carcinoma in situ of rectumD01.4Carcinoma in situ of other and unspecified parts of intestineD01.5Carcinoma in situ of liver, gallbladder and bile ductsD01.7Carcinoma in situ of other specified digestive organsD01.9Carcinoma in situ of digestive organ, unspecified

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Code Information

CodeD01.3
BillableYes
ParentD01
CategoryNeoplasms (C00-D49)
Excludes15 rule(s)
Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)