Alternate Name	Item#	Length	Source of Standard	Column #
Coding System for Extent of Disease (SEER)	870	1	SEER	937-937

Description
Indicates the type of SEER EOD code applied to the tumor. Should be used whenever EOD coding is applied.

Rationale
Used in data editing and analysis.

Codes

0	2-Digit Nonspecific Extent of Disease (1973-82)
1	2-Digit Site-Specific Extent of Disease (1973-82)
2	13-Digit (expanded) Site-Specific Extent of Disease (1973-1982)
3	4-Digit Extent of Disease (1983-87)
4	10-Digit Extent of Disease, 1988 (1988-2003)
Blank	Cases diagnosed 2004+; or the item is not collected