Question: 20190044

Status


Final

Category


#1:   Solid Tumor Rules (2018)
#2:   Histology
#3:   Colon


References


Source 1:   2018 Solid Tumor Rules
pgs:   27
Notes:   Colon, January 2019 Update
Source 2:   SINQ 20170058
pgs:  
Notes:  


Question


Solid Tumor Rules (2018)/Histology--Colon: Is the term phenotype equivalent to type, subtype, variant for the purpose of coding histology? See Discussion.
 



Discussion


In our region, pathologists often describe histology using the term phenotype. However, the use of the term phenotype is not discussed in the Solid Tumor Manual.

Example: Final Diagnosis of a colon tumor is invasive adenocarcinoma with a mixed phenotype, and the Diagnosis Comment states: The majority of the disease is poorly differentiated/signet ring cell phenotype.

Would the histology be coded to 8490 (signet ring cell carcinoma), if the majority of the tumor is a more specific histology described by the term phenotype?



Answer


While variant, type, and subtype can be used interchangeably according to the Solid Tumor Rules, SINQ 20170058 states that the Multiple Primaries/Histology (now Solid Tumor) Rules do not include coding phenotype.  Code as invasive adenocarcinoma NOS (8140).



History




Last Updated


05/31/2019

Date Finalized


07/19/2019