The start date of the pharmacy's relationship with a chain or franchise as reported to NCPDP.
Some pharmacies share a relationship with a common organization. For each of these pharmacies, there is a relationship ID (RELATIONSHIP_ID) and type (RELATIONSHIP_TYPE).
Additional details regarding the National Council for Prescription Drug Programs (NCPDP) source data are available at: https://www.ncpdpdataq.org/dataQInfo/pages/dataQFiles.htm.
Source: NCDPD DataQ™