ICD-10-CM · Chapter 2

D01..3 Carcinoma in situ of anus and anal canal

Billable

← D01 — Carcinoma in situ of other and unspecified digestive organs Chapter 2: C00-D49

Includes

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

Excludes 1 (cannot be coded 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)

Last reviewed: September 2026