Wiki adenocarcinoma pancreatic pseudocyst/Gastric tumor

[Trendale]

Hello,
What would be the correct way to code adenomacarcinoma pancreatic pseudocyst and adenocarcinoma gastric tumor? The instructions in the ICD-9 says to see neoplasm by site malignant if not under adenocarcinoma. I have 157.9 and 151.9
Thanks!

 

[cristig4]

Adenomcarcinoma just describes the histologic type (for example breast cancer could be adenocarcima or infiltrating ductal). You want to code the location of the tumor. If you don't have a specific site then you would use the xxx.9 for both neoplasms as they have no specified location.