D01.3 Carcinoma in situ of anus and anal canal

Billable ICD-10-CM code, FY2026.

Applicable to

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

Excludes1 (never code 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)

Applies from D01 Carcinoma in situ of other and unspecified digestive organs

Excludes1 (never code together)

• melanoma in situ (D03.-)

MS-DRG index

Defines the logic of DRG(s) 374-376 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 230.5 Carcinoma in situ of anal canal (approximate)
• 230.6 Carcinoma in situ of anus, unspecified (approximate)

Code annotations containing back-references to D01.3

Back-references to D01.3

• Type 1 Excludes: D04.5 Carcinoma in situ of skin of trunk ("carcinoma in situ of anus NOS (D01.3)")
• Type 1 Excludes: K62.82 Dysplasia of anus ("anal intraepithelial neoplasia III (D01.3)")
• Type 1 Excludes: K62.82 Dysplasia of anus ("carcinoma in situ of anus (D01.3)")
• Type 1 Excludes: K62.82 Dysplasia of anus ("severe dysplasia of anus (D01.3)")
• Type 1 Excludes: R85.61 Abnormal cytologic smear of anus ("carcinoma in situ of anus (histologically confirmed) (D01.3)")
• Type 1 Excludes: R85.61 Abnormal cytologic smear of anus ("anal intraepithelial neoplasia III [AIN III] (D01.3)")
• Type 1 Excludes: R85.61 Abnormal cytologic smear of anus ("severe dysplasia of anus (histologically confirmed) (D01.3)")

Diagnosis Index entries for D01.3

• Dysplasia › anus (histologically confirmed) (mild) (moderate) › severe
• Neoplasia › intraepithelial (histologically confirmed) › anal (AIN) (histologically confirmed) › severe

Nearby codes

• D01 Carcinoma in situ of other and unspecified digestive organs
• D01.0 Carcinoma in situ of colon
• D01.1 Carcinoma in situ of rectosigmoid junction
• D01.2 Carcinoma in situ of rectum
• D01.3 Carcinoma in situ of anus and anal canal (this code)
• D01.4 Carcinoma in situ of other and unspecified parts of intestine
• D01.40 Carcinoma in situ of unspecified part of intestine
• D01.49 Carcinoma in situ of other parts of intestine
• D01.5 Carcinoma in situ of liver, gallbladder and bile ducts
• D01.7 Carcinoma in situ of other specified digestive organs