Formulary Moves
What changed on Medicare Part D formularies this month, from public CMS files.
Drug moves
observedCMS Part D formulary files, September 2026 vs August 2026. Files dated September 16, 2026 and August 19, 2026; 328 formularies in both files.
- Insulin Glargine-YfgnAdded to 7 formularies7observed
- Breztri AerosphereAdded to 1 formulary1observed
- JanumetAdded to 1 formulary1observed
- Janumet XrAdded to 1 formulary1observed
- Ventolin HfaAdded to 1 formulary1observed
Employer plans
observedemployer plans switched to a carrier with a different pharmacy benefit manager this month, across 3 states.
Carrier employer network files, October 2026 vs September 2026. The carrier switch is observed in the public files. For all 4 the pharmacy benefit change is inferred from the carrier, since an employer can carve its drug benefit out to another PBM.
Which employers? Employer names, states and the pharmacy benefit managers on both sides of each switch are coming to signed in PBSwitch accounts. Create a free account to be first in line.
How this is built
- Drug moves compare two CMS monthly Part D formulary files, formulary by formulary, for the 500 most prescribed Part D drugs by 2024 Medicare claims (485 of them appear on formularies in the newer file). A move is a drug that appears on, or disappears from, a formulary present in both files.
- Employer switches compare public employer network files from two large commercial carriers month over month. A switch is an employer plan that leaves one carrier and joins the other in the same month.
- No plan names, tiers or patient data on this page. Facts only: this page does not recommend any drug, plan or benefit design. Read the method.