Beginning in 2024, Medicare Part D plans would be permitted to substitute interchangeable biosimilars as soon as they are available, without waiting for the beginning of the next benefit year, under a proposed rule released by the Centers for Medicare and Medicaid Services on 14 December.
Interchangeable Biosimilars May Qualify For ‘Immediate Substitution’ In Medicare Part D
Proposed policy could help promote uptake of interchangeable biosimilars to AbbVie’s blockbuster Humira. However, some PBMs and insurers are not persuaded that interchangeability is a useful distinction so may not rush to take advantage of the new flexibility.

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The development could highlight the power of competitive market forces over government price controls or suggest Medicare price negotiation is enhancing competitive market forces.
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