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        Item #
        Length
        Source of Standard
        Year Implemented
        Version Implemented
        Year Retired
        Version Retired
        Column #
    
    
        361
        1
        Census
        2018
        18
        
        
        204 - 204
    



NAACCR XML: Tumor.censusBlockGroup2020




Description
This field is provided for coding the block group of patient's residence at time of diagnosis, as defined by the 2020 Census.
Rationale
A block group is a subdivision of a census tract designed to have approximately 1500, socially homogeneous people, versus census tracts which are designed to have approximately 4000 people. All land area in the United States is described by a census block group in the 2020 Census. The Census Bureau publishes detailed population and socioeconomic data at this level. Block groups thus offer a high level of specificity for geographical and socioeconomic analyses.

A block group has no meaning in the absence of a census tract. Refer to Census Tr Certainty 2020 [369] to ascertain basis of assignment of Census Block Group 2020.

Codes

    
        
            0-9
            Census block group values as defined by the Census Bureau
        
        
            Blank
            Census Block Group 2020 not coded
        
        
            
            
        
    


    Comment:
    Historically, some registries made the distinction between "attempted, could not be determined" and "not coded" by using a 0 for "attempted." However, 0 is a valid block group value.
    
Note: The values 0 through 9 are nominal, with no hierarchy of values. This number determines the first digit of all the blocks which comprise the block group; for instance, census block group 3 would contain blocks numbered 3000 to 3999.
0-9	Census block group values as defined by the Census Bureau
Blank	Census Block Group 2020 not coded