C21Non-billable (header)

Malignant neoplasm of anus and anal canal

Related Codes· Malignant neoplasms of digestive organs (C15-C26)

C15Malignant neoplasm of esophagusC16Malignant neoplasm of stomachC17Malignant neoplasm of small intestineC18Malignant neoplasm of colonC19Malignant neoplasm of rectosigmoid junctionC20Malignant neoplasm of rectumC22Malignant neoplasm of liver and intrahepatic bile ductsC23Malignant neoplasm of gallbladderC24Malignant neoplasm of other and unspecified parts of biliary…C25Malignant neoplasm of pancreas

Sub-codes of C21(4)

C21 is a non-billable header. Select a sub-code to bill.

C21.0Malignant neoplasm of anus, unspecified✓ BillableC21.1Malignant neoplasm of anal canal✓ BillableC21.2Malignant neoplasm of cloacogenic zone✓ BillableC21.8Malignant neoplasm of overlapping sites of rectum, anus and …✓ Billable

⚠ Excludes 2(Not included here)

  • •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)

Code Hierarchy

┌2Neoplasms (C00-D49)├C15-C26Malignant neoplasms of digestive organs (C15-C26)├C21Malignant neoplasm of anus and anal canal
└C21Malignant neoplasm of anus and anal canal

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