kodex

Kodex

ICD-10-CM
Code

C21.1

Malignant neoplasm of anal canal

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Hierarchy

  • C00-D49 Neoplasms (C00-D49)
    • C00-C96 Malignant neoplasms (C00-C96)
      • C00-C75 Malignant neoplasms, stated or presumed to be primary (of specified sites), and certain specified histologies, except neuroendocrine, and of lymphoid, hematopoietic and related tissue (C00-C75)
        • C15-C26 Malignant neoplasms of digestive organs (C15-C26)
          • C21 Malignant neoplasm of anus and anal canal
            • 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

Notes

C00-D49

  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
    • C25.9 Malignant neoplasm of pancreas, unspecified

Inclusion Terms

C21.1

  • Malignant neoplasm of anal sphincter

Excludes 1

C15-C26

  • C46.4 Kaposi's sarcoma of gastrointestinal sites

Excludes 2

C21

  • malignant carcinoid tumors of the colon (C7A.02-)
    • C7A.02 Malignant carcinoid tumors of the appendix, large intestine, and rectum
  • malignant melanoma of anal margin (C43.51)
    • C43.51 Malignant melanoma of anal skin
  • C43.51 Malignant melanoma of anal skin
  • malignant melanoma of perianal skin (C43.51)
    • C43.51 Malignant melanoma of anal skin
  • other and unspecified malignant neoplasm of anal margin (C44.500, C44.510, C44.520, C44.590)
    • C44.500 Unspecified malignant neoplasm of anal skin
    • C44.510 Basal cell carcinoma of anal skin
    • C44.520 Squamous cell carcinoma of anal skin
    • C44.590 Other specified malignant neoplasm of anal skin
  • other and unspecified malignant neoplasm of anal skin (C44.500, C44.510, C44.520, C44.590)
    • C44.500 Unspecified malignant neoplasm of anal skin
    • C44.510 Basal cell carcinoma of anal skin
    • C44.520 Squamous cell carcinoma of anal skin
    • C44.590 Other specified malignant neoplasm of anal skin
  • other and unspecified malignant neoplasm of perianal skin (C44.500, C44.510, C44.520, C44.590)
    • C44.500 Unspecified malignant neoplasm of anal skin
    • C44.510 Basal cell carcinoma of anal skin
    • C44.520 Squamous cell carcinoma of anal skin
    • C44.590 Other specified malignant neoplasm of anal skin

C15-C26

  • C49.A Gastrointestinal stromal tumor

Related Terms