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HomeICD-10 CodesC21
ICD-10-CM
Non-billable

C21

Classification
Category:Neoplasms
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Coding Guidance
C21 should not be used for reimbursement purposes as there are more specific codes below it that contain a greater level of detail.
Includes
From C00-D49
Excludes 2
malignant carcinoid tumors of the colon
malignant melanoma of anal margin
malignant melanoma of anal skin
malignant melanoma of perianal skin
other and unspecified malignant neoplasm of anal margin
other and unspecified malignant neoplasm of anal skin
other and unspecified malignant neoplasm of perianal skin

More Specific Codes

C21.0
Malignant neoplasm of anus, unspecified
C21.1
Malignant neoplasm of anal canal
C21.2
Malignant neoplasm of cloacogenic zone
C21.8
Malignant neoplasm of overlapping sites of rectum, anus and anal canal

External Resources

2025 ICD-10 guidelines from CMS.gov