Alternate Name	Item#	Length	Source of Standard	Column #
Census Tract Certainty	364	1	SEER	167-167

Description
Code indicating basis of assignment of census tract or block numbering area (BNA) for an individual record.Helpful in identifying cases tracted from incomplete information or P.O. Box. This item is not coded by the hospital. Central registry staff manually assign the code.

Codes

1	Census tract/BNA based on complete and valid street address of residence
2	Census tract/BNA based on residence ZIP + 4
3	Census tract/BNA based on residence ZIP + 2
4	Census tract/BNA based on residence ZIP code only
5	Census tract/BNA based on ZIP code of P.O. Box
6	Census tract/BNA based on residence city where city has only one census tract, or based on residence ZIP code where ZIP code has only one census tract
9	Not assigned, geocoding attempted
Blank	Not assigned, geocoding not attempted

Clarification of NPCR Required Status
Census-1990 data items:	Census-2000 data items:
Census Tract 1970/80/90 [110]	Census Tract 2000 [130]
Census Tr Cert 1970/80/90 [364]	Census Tr Certainty 2000 [365]
Census Tract Cod Sys--1970/80/90 [120]

Information on census tract, census tract certainty, and census tract coding system is required. For tumors diagnosed in or after 2003, Census Tract 2000 [130] and Census Tr Certainty 2000 [365] (Census-2000 data items) are required. For tumors diagnosed in or before 2002, the requirement can be met by collecting either the Census-1990 data items [110, 364, 120] or the Census-2000 data items, although the Census-2000 data items [130 and 365] are recommended for tumors diagnosed in 1998 through 2002.