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Glyburide / Metformin is a generic drug. What agents check before quoting it: how many 2026 Part D plans cover it, on which tier, with what restrictions and copays, by plan type, carrier and state.
In 2026, 1,215 of 5,496 Medicare Part D and Medicare Advantage drug plans (22.1%) list Glyburide / Metformin on their formulary, across 183 of 328 formularies. The most common placement is tier 1 (441 plans, 36.3% of those covering it). 98 of the covering plans require prior authorization (8.1%), 0 step therapy and 684 a quantity limit.
1,081 covering plans charge a flat copay for a 30-day supply at a preferred retail pharmacy after the deductible — median $0, 854 of them $0; 134 charge coinsurance instead — median 25% of the drug's cost. Once a member's out-of-pocket drug spending reaches $2,100 in 2026, covered drugs cost $0 for the rest of the year.
2025: 2,073 of 5,631 plans covered it (36.8%); 2026: 1,215 of 5,496 (22.1%).
Of 4,368 plans offered in both years, 46 added it to the formulary and 709 dropped it.
Among plans covering it both years, 36 moved it to a higher tier and 7 to a lower one; 13 added prior authorization and 1 removed it.
Medicare Part D paid for 119,496 30-day fills of Glyburide / Metformin in 2024 for about 15,587 enrollees, at an average total cost of $9.06 per 30-day fill (CMS Part D Prescribers by Geography and Drug, national).
Price Glyburide / Metformin and the rest of a client's list on every plan in their county.
Estimate Glyburide / Metformin costs by plan
Free tools for licensed insurance agents. Data from CMS public files; verify with plan documents before advising a client.
Counts are over every Medicare Advantage drug plan and stand-alone Part D plan in the CMS monthly formulary files, excluding employer plans. A plan counts as covering a drug when any strength or form of it is on the plan’s formulary; the tier, prior authorization, step therapy and quantity limit shown are the most favorable version on that formulary. Copays are for a 30-day supply at a preferred retail pharmacy after the deductible. This is a reference for licensed agents, not a plan recommendation; verify with the plan’s formulary before advising a client. Source: CMS Part D formulary files (release 09/16/2026). CMS formulary data.