SEER Extent

Field Length:  2

(Required field with all cases diagnosed from January 1, 2000 to December 31, 2003.)

 As of 1-1-2004, leave this field blank and code information in the Collaborative Stage item #30540 instead.

Code the farthest documented extension of tumor away from the primary site, either by contiguous extension or distant metastasis.

The description of the primary tumor growth within the organ of origin or its extension to neighboring organs, or its metastasis to distant sites is summarized in a two-digit code. It is a hierarchical code in which the most extensive disease is all that is coded. Thus, information about the extent of the tumor within the primary site is lost if the tumor extends to neighboring organs, and extension to neighboring organs is lost if there is distant metastasis. Code '99' is reserved for unknown extension, except for prostate.

Use the instructions in the SEER Extent of Disease 1998 Codes and Coding Instructions manual, page 7, and the tables that follow, to code this field.

This field must match the behavior code. If behavior is /2, this data element must be coded in-situ\non-invasive (00, 01, 02, 03, 04, 05).