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Monthly · September 2026

Formulary Moves

What changed on Medicare Part D formularies this month, from public CMS files.

How every number is sourced

Drug moves

observed

CMS Part D formulary files, August 2026 vs July 2026. Files dated August 19, 2026 and July 22, 2026; 327 formularies in both files.

  1. Rybelsus
    Dropped from 312 formularies
    Note: Manufacturer discontinuation.
    312
    observed
  2. Gemtesa
    Added to 3 formularies
    3
    observed
  3. Xiidra
    Added to 2 formularies
    2
    observed
  4. Symbicort
    Added to 1 formulary
    1
    observed

Also in this file: 1 new formulary appeared. A whole formulary arriving or leaving is counted here, not as drug moves. observed

Employer plans

Employer switch tracking starts with the October 2026 edition, the first month with two carrier snapshots to compare.

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.

Not medical advice. This page describes insurance coverage data and policy documents. It is not medical, legal, or benefits advice, and it is not a recommendation to take, prescribe, or switch any medication. Talk to your doctor or pharmacist about treatment decisions.

Not a coverage guarantee. Coverage, tier, prior authorization, step therapy, and quantity-limit data are compiled from CMS public files and plan documents dated August 19, 2026. Plans change formularies during the year and individual coverage depends on your specific plan, pharmacy, and coverage phase. Always verify with your plan's current formulary documents or by calling the number on your member ID card. Medicare beneficiaries can compare plans at Medicare.gov or 1-800-MEDICARE.

PBSwitch is a private company. We are not connected with or endorsed by the U.S. government, the federal Medicare program, or any insurance plan or drug manufacturer. Sources: CMS monthly Part D formulary file of August 19, 2026, CMS monthly Part D formulary file of July 22, 2026. Methodology: compiled from the public source files cited above. Clinical review by a PharmD is in progress. Page updated 2026-10-21.

PBSwitch publishes plan- and policy-level data only. We hold no patient-level or claims-level identifiable data.