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ICD-10C26.9 - Malignant neoplasm of ill-defined sites within the digestive system
Chapter 2
Section C15-C26
C26.9
ICD-10Billable
Malignant neoplasm of ill-defined sites within the digestive system
Inclusion terms:
Malignant neoplasm of alimentary canal or tract NOS
Malignant neoplasm of gastrointestinal tract NOS
Specifically for this code:
malignant neoplasm of abdominal NOS (C76.2)
malignant neoplasm of intra-abdominal NOS (C76.2)
From Section C15-C26:
Kaposi's sarcoma of gastrointestinal sites (C46.4)
From Chapter 2:
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).
From Section C15-C26:
gastrointestinal stromal tumors (C49.A-)
This ICD-10 code translates to more than one ICD-9 code:
159.8
ICD-9Billable
Malignant neoplasm of other sites of digestive system and intra-abdominal organs
159.9
ICD-9Billable
Malignant neoplasm of ill-defined sites within the digestive organs and peritoneum