January 3, 2019

The ‘master’ LPNO used to identify a Chain. It is generally the LPNO belonging to the earliest record in a person’s Chain that has been sourced from a Core health dataset. The ROOT and Chain Number will largely correspond 1-to-1.

The ROOT is used for:
(1) ease of processing (they can be handled the same as LPNOs); and
(2) security (i.e., Research Data Services provides the encrypted ROOT to Data Applicants to identify Chains, rather than the Chain Number).

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