EOD Mets

Coding mets for colon and rectum is based on several different factors

• No evidence of metastatic disease
  • Default to no metastatic disease when there is no documentation on the metastatic workup.
• Distant lymph node involvement
  • Iliac
  • Retroperitoneal (can also be regional for some subsites)
  • Superior mesenteric
• Discontiguous and contiguous metastatic involvement
  • Most common metastatic sites for colon and rectum are liver, and lung.
  • Note 1: For cecum primaries (C180), direct or contiguous extension into the liver is recorded in EOD Primary Tumor, not EOD mets.
  • Note 2: For ascending colon primaries (C182), direct or contiguous extension into the right lobe of the liver is recorded in EOD Primary Tumor, not EOD mets.

See SEER*RSA, Colon and Rectum, for the current version of EOD and complete coding instructions for the Colon and Rectum schema.

Updated: June 24, 2025