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National Cancer Data Base - Data Dictionary PUF 2015
DD_category: 
PUF Data Item Name: 
PUF_CASE_ID
Diagnosis Years Available: 
All
length: 
37
Description: 
Unique case identification number assigned to the case in the PUF.
Registry Coding Instructions: 

None.

NCDB System Code Assignments: 

NCDB assigned value that uniquely identifies each case included in the PUF. The value assigned to each case is selected at random, and the value assigned to each case will change with each issued PUF. The PUF Case IDs are not the same across cancer sites, and cases cannot be linked across cancer sites.

Note that the length of this key was expanded from 10 to 37 in January 2014.