For dates of service on and after October 1, 2012, when providers submit claims for services or supplies that require an order, prescription, or referral, the submitting providers will be required to include the National Provider Identifier (NPI) of the provider who ordered, prescribed, or referred the services or supplies. The IHCP’s claims processing will monitor whether the ordering, prescribing, or referring provider is enrolled in the IHCP. Claims will deny if the ordering, prescribing or referring provider is not enrolled.