Implementation of New Provider Authentication Requirements for Medicare Contractor Provider Telephone and Written Inquiries

CMS will require the National Provider Identifier (NPI), Provider Transaction Access Number (PTAN), and the last 5-digits of the tax identification number (TIN) of the provider to authenticate a call. CMS will also request the NPI, PTAN, and TIN for written correspondence with exceptions for providers who use letterhead. For this change request, the implementation date precedes the effective date to allow for shared-system and/or business process updates before new claims processing policies take effect.