C7A
Malignant neuroendocrine tumors
C7A is a non-billable ICD-10-CM code category for malignant neuroendocrine tumors. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are C7A.0 Malignant carcinoid tumors, C7A.1 Malignant poorly differentiated neuroendocrine tumors and C7A.8 Other malignant neuroendocrine tumors. Its coding notes include a Use additional code instruction, a Code also instruction and 2 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
- code to identify any associated endocrine syndrome, such as:
- carcinoid syndrome (E34.00)
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
- any associated multiple endocrine neoplasia [MEN] syndromes (E31.2-)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Notes
Also from chapter/block level (8 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).
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry