NAACCR Item #3960: Histologic Subtype
| Item # | Length | Source of Standard | Year Implemented | Version Implemented | Year Retired | Version Retired |
|---|---|---|---|---|---|---|
| 3,960 | 1 | SEER | 2023 | 23 |
NAACCR XML: Tumor.histologicSubtype
Description
Histology code for appendiceal tumors (8480) is defined as “Mucinous Adenocarcinoma (in situ or invasive).” In the AJCC 8th chapter for Appendix-Carcinoma, there are also low-grade appendiceal mucinous neoplasm (LAMN) and high-grade appendiceal mucinous neoplasm (HAMN) diagnoses that are assigned the same histology.
Due to the different natures of these histologies, there is interest in tracking these different types of tumors. With the current histology codes, a distinction cannot be made. A histology subtype data item is needed.
Codes
| 0 | Histology is NOT 8480 |
| 1 | Low-grade appendiceal mucinous neoplasm LAMN |
| 2 | High-grade appendiceal mucinous neoplasm HAMN |
| 3 | Mucinous Adenocarcinoma/carcinoma Mucus Adenocarcinoma/carcinoma Mucoid adenocarcinoma/carcinoma Colloid adenocarcinoma/carcinoma |
| 4 | Other terminology coded to 8480 |
| Blank | NA-Diagnosis year is prior to 2023 |