Neoplasm Table

rectum (ampulla)

Site	Malignant primary	Malignant secondary	Ca in situ	Benign	Uncertain behavior	Unspecified behavior
rectum (ampulla)	C20	C78.5	D01.2	D12.8	D37.5	D49.0
and colon	C19	C78.5	D01.1	D12.7	D37.5	D49.0
overlapping lesion with anus or rectosigmoid junction	C21.8	—	—	—	—	—

Use the index to find a code, then confirm it in the Tabular List before assigning it. A code ending in a dash is incomplete, and a code in [brackets] is a manifestation code reported after the underlying condition. Search the whole index.

Frequently asked questions

What are the ICD-10-CM neoplasm codes for rectum?

Per the ICD-10-CM Neoplasm Table: malignant primary C20; malignant secondary C78.5; ca in situ D01.2; benign D12.8; uncertain behavior D37.5; unspecified behavior D49.0. Always confirm the code, and add the required 7th character where applicable, in the Tabular List.

ICD-10-CM Neoplasm Table maintained by CDC/NCHS (public domain), from the CMS FY2027 release.