C21

Non-Billable

ChapterC00–D49

Rankcategory

Official Description

Malignant neoplasm of anus and anal canal

Use a more specific code (4 billable)

Metadata & Insights

Excludes1(Not coded here. Use a different code.)

Excludes2(Not included here. Code separately if applicable.)

Excludes2(Not included here. Code separately if applicable.)

malignant carcinoid tumors of the colon (C7A.02-)
malignant melanoma of anal margin (C43.51)
malignant melanoma of anal skin (C43.51)
malignant melanoma of perianal skin (C43.51)
other and unspecified malignant neoplasm of anal margin (C44.500, C44.510, C44.520, C44.590)
other and unspecified malignant neoplasm of anal skin (C44.500, C44.510, C44.520, C44.590)
other and unspecified malignant neoplasm of perianal skin (C44.500, C44.510, C44.520, C44.590)

BillableHas subcodes

CH2Neoplasms (C00-D49)

C15-C26Malignant neoplasms of digestive organs (C15-C26)

C21Malignant neoplasm of anus and anal canalNot billable

C21.0Malignant neoplasm of anus, unspecifiedBillable

C21.1Malignant neoplasm of anal canalBillable

C21.2Malignant neoplasm of cloacogenic zoneBillable

C21.8Malignant neoplasm of overlapping sites of rectum, anus and anal canalBillable

The following parent sections contain instructions or notes that apply to C21:

Malignant neoplasms of digestive organs (C15-C26)

2026

No direct MS-DRG triggers identified.

Find surgical and procedural codes related to Malignant neoplasm of anus and anal canal.