CRGC News Broadcast NB-2022-018
December 6, 2022
Solid Tumor Rules:
2023 Other Sites Rules Posted

The 2023 Other Sites Rules have undergone comprehensive revisions and have been posted on the SEER Website. The 2023 consolidated pdf is now available for download for use beginning with cases diagnosed 1/1/2023 forward.

Note: For cases diagnosed 1/1/2007-12/31/2022, the 2007 MP/H and 2007 General Instructions are to be used, with a few exceptions.

The following primary sites are excluded from the Other Sites module for 1/1/2018 forward:
  • Rectosigmoid and rectum which are included in Colon Solid Tumor Rules
  • Peripheral nerves which are included in the Malignant CNS Solid Tumor Rules

IMPORTANT INFORMATION: The Solid Tumor Rules Editors strongly recommend reading through the entire Solid Tumor Other Sites module prior to using. The other sites rules now align with the other solid tumor site modules, however, there are some differences:

•            New site based M and H rules have been added to address changes in clinical practice. 

•            Histology tables for the majority of site groups covered by Other Sites Solid Tumor Rules have been added as histology coding reference tools. It is important to read the information provided in each table to use the tables correctly as some additional histology coding instructions are included in select tables.

The updated Solid Tumor Rules may be accessed at:
If you have questions or concerns regarding any of the content of this CRGC News Broadcast please contact me.

Mignon Dryden, CTR
Director, E-Reporting
Cancer Registry of Greater California