ICD 10 CM Codes

Note
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).
C00-C96 Malignant neoplasms (C00-C96)
C7A-C7A Malignant neuroendocrine tumors (C7A)
C7B-C7B Secondary neuroendocrine tumors (C7B)
C76-C80 Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80)
C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
D00-D09 In situ neoplasms (D00-D09)
D10-D36 Benign neoplasms, except benign neuroendocrine tumors (D10-D36)
D3A-D3A Benign neuroendocrine tumors (D3A)
D37-D48 Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes (D37-D48)
D49-D49 Neoplasms of unspecified behavior (D49)