We also finalized in the CY 2018 PFS final rule (82 FR 52982 through 52983) a policy to apply these service-level overrides for both PE and MP, rather than one or the other category
CMS would identify the months for which a beneficiary has Medicaid coverage with cost-sharing assistance using available information (for example the State MMA File of dually eligible beneficiaries) at the time the rebate amount is being calculated for a calendar quarter

For example, if CMS grants a severe supply chain disruption rebate reduction request for a generic Part D rebatable drug or biosimilar that was submitted on November 15, 2024, and that generic Part D rebatable drug or biosimilar is currently in shortage from September 15, 2025, until May 15, 2026, CMS would apply a 75 percent reduction in the total rebate amount for the duration of the applicable period for which the severe supply chain disruption rebate reduction request was granted (that is, October 1, 2024, to September 30, 2025), and then would apply the shortages reduction as proposed in 428.301, beginning with a reduction of 25 percent for a biosimilar or 75 percent for a generic Part D rebatable drug or plasma-derived product that is a biosimilar for the applicable period beginning October 1, 2025
These treatments use carbamide peroxide or hydrogen peroxide to break up the stains and remove them from your teeth