Frequently Asked Questions

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How will Part D Plans be able to crosswalk a beneficiary's Health Insurance Claim Number (HICN) and Medicare Beneficiary Identifier (MBI) number after the new MBI numbers are implemented?

To assist Medicare Advantage Organizations (MAOs) and Part D sponsors with the ability to determine or match their beneficiary population between HICN and MBI, the Medicare Advantage Prescription Drug System (MARx) will generate and distribute a monthly crosswalk data file. Each crosswalk data file will be created at the MAO/Prescription Drug Plan (PDP) Contract level. The crosswalk files will be sent monthly during the transition period.

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