CMS Makes An Impactful Change Regarding Biosimilars
Within its final calendar year 2025 Medicare Advantage and Part D final rule seen here, the Centers for Medicare and Medicaid Servces (CMS) is allowing Part D sponsors the ability to make midyear substitutions of biosimilars for their reference products on their formularies.
Specifically:
All biosimilars may be substituted as formulary maintenance changes: Part D sponsors may treat formulary substitutions of all biosimilars for their reference products as “maintenance changes” that would not require explicit prior approval by CMS. This option has previously been available only for interchangeable biological products. Part D sponsors previously had to obtain explicit approval prior to substituting biosimilars other than interchangeable biological products, and these substitutions applied only to enrollees who began therapy after the effective date of the change — delaying enrollees’ access to cheaper options. Treating all biosimilar substitutions as maintenance changes means that midyear formulary substitutions of biosimilars for their reference products would apply to all enrollees (including those already taking the reference product prior to the effective date of the change) following a 30-day advance notice to affected enrollees.
New interchangeable biological products may be immediately substituted: We are finalizing additional flexibility for interchangeable biological products not on the market at the time that Part D sponsors submit their initial formulary for CMS approval. Part D sponsors meeting certain requirements have the additional option to immediately substitute a new interchangeable biological product for a reference product and provide notice of the change to affected enrollees after making such change.
Biosimilar policy continues to evolve. It’s important to be in the know to plan accordingly.
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