1. C7A Malignant neuroendocrine tumors

    Use Additional code to identify any associated endocrine syndrome, such as:
    carcinoid syndrome (E34.0)

    Excludes2

    • malignant pancreatic islet cell tumors (C25.4)
    • Merkel cell carcinoma (C4A.-)
    1. C7A.0 Malignant carcinoid tumors

      1. C7A.00 Malignant carcinoid tumor of unspecified site

      2. C7A.01 Malignant carcinoid tumors of the small intestine

        • C7A.010 Malignant carcinoid tumor of the duodenum
        • C7A.011 Malignant carcinoid tumor of the jejunum
        • C7A.012 Malignant carcinoid tumor of the ileum
        • C7A.019 Malignant carcinoid tumor of the small intestine, unspecified portion
      3. C7A.02 Malignant carcinoid tumors of the appendix, large intestine, and rectum

        • C7A.020 Malignant carcinoid tumor of the appendix
        • C7A.021 Malignant carcinoid tumor of the cecum
        • C7A.022 Malignant carcinoid tumor of the ascending colon
        • C7A.023 Malignant carcinoid tumor of the transverse colon
        • C7A.024 Malignant carcinoid tumor of the descending colon
        • C7A.025 Malignant carcinoid tumor of the sigmoid colon
        • C7A.026 Malignant carcinoid tumor of the rectum
        • C7A.029 Malignant carcinoid tumor of the large intestine, unspecified portion

          Inclusion term(s):

          • Malignant carcinoid tumor of the colon NOS
      4. C7A.09 Malignant carcinoid tumors of other sites

        • C7A.090 Malignant carcinoid tumor of the bronchus and lung
        • C7A.091 Malignant carcinoid tumor of the thymus
        • C7A.092 Malignant carcinoid tumor of the stomach
        • C7A.093 Malignant carcinoid tumor of the kidney
        • C7A.094 Malignant carcinoid tumor of the foregut, unspecified
        • C7A.095 Malignant carcinoid tumor of the midgut, unspecified
        • C7A.096 Malignant carcinoid tumor of the hindgut, unspecified
        • C7A.098 Malignant carcinoid tumors of other sites
    2. C7A.1 Malignant poorly differentiated neuroendocrine tumors

      Inclusion term(s):

      • Malignant poorly differentiated neuroendocrine tumor NOS
      • Malignant poorly differentiated neuroendocrine carcinoma, any site
      • High grade neuroendocrine carcinoma, any site
    3. C7A.8 Other malignant neuroendocrine tumors

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.