D12.9 Benign neoplasm of anus and anal canal

Instructional Notes:

D12.9
Description: Benign neoplasm of anus and anal canal
Exclude1:
- benign neoplasm of anal margin (D22.5, D23.5)
- benign neoplasm of anal skin (D22.5, D23.5)
- benign neoplasm of perianal skin (D22.5, D23.5)
Inclusion Term:
- Benign neoplasm of anus NOS
↓
D12
Description: Benign neoplasm of colon, rectum, anus and anal canal
Exclude2:
- benign carcinoid tumors of the large intestine and rectum (D3A.02-)
- polyp of colon NOS (K63.5)
↓
D10-D36
Description: Benign neoplasms, except benign neuroendocrine tumors (D10-D36)
↓
C00-D49
Description: Neoplasms
Notes:
- 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).