RPC ID is a unique identifier that is assigned to activities by REMS Program Companies (RPC) when it provides commercial support for an activity. Accredited providers that offer RPC-supported REMS activities are required to enter the RPC ID in the correct field in PARS. This will ensure that their RPC-supported activity can be both identified and reported to the RPC and, eventually, to the FDA. You can contact the RPC directly if you have additional questions related to the RPC ID.