Code the ACoS CoC coding system currently used in the record. CoC codes may be converted from an earlier version.

00	No CoC coding system used
01	Pre-1988 (Cancer Program Manual Supplement)
02	1988 Data Acquisition Manual
03	1989 Data Acquisition Manual Revisions
04	1990 Data Acquisition Manual Revisions
05	1994 Data Acquisition Manual (Interim/Revised)
06	ROADS (effective with cases diagnosed 1996-1997)
07	ROADS and 1998 Supplement (effective with cases diagnosed 1998-2002)
08	FORDS (effective with cases diagnosed 2003 and forward)
99	Unknown coding system