Version 26
Data Item #81: State at DX Geocode 1970/80/90

Code for the state of the patient's residence at the time the tumor was diagnosed is a derived (geocoded) variable based on Census Boundary files from 1970, 1980, or 1990 Decennial Census.

Populating the GeoLocationID 70/80/90 [351] correctly requires FIPS code for state and not the USPS abbreviations. Also, on rare occasions, the boundaries of states do change (North Carolina and South Carolina border, for example).

Instructions for Coding

• This variable is generated through the process of geocoding either during abstracting or at the central registry level. For U.S. residents, this data item stores the county codes issued by the Federal Information Processing Standards (FIPS) publication Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas. The information in this publication is available in the FIPS Codes for Counties and Equivalent Entities Section.
• It is recommended that geocoding be performed using the NAACCR geocoder.
• It is recommended that all cases diagnosed through 1999 should have a State at DX Geocode 70/80/90 [81] based on 1990 Census.
• At a minimum, all cases diagnosed through 1995-1999 should have a geocoded State at DX Geocode 1990 [81]. Some cases, such as those diagnosed in 1999, must have both State at DX Geocode 1990 [81] and State at DX Geocode 2000 [82] codes for proper assignment of the Census Tr Poverty Indicatr [145].
• Do not update this item if the patient's residence changes. Store address update information in the affiliated current address data items. Only update based on improved information on the residential address at time of diagnosis.
• PO Box address information should not be used to geocode this data item except in the infrequent case when no other address information is available.
• If the patient has multiple tumors, the county codes may be different for each tumor.

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