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Humulin R is a brand of insulin, regular, human. 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, 5,215 of 5,496 Medicare Part D and Medicare Advantage drug plans (94.9%) list Humulin R on their formulary, across 318 of 328 formularies. The most common placement is tier 3 (2,496 plans, 47.9% of those covering it). 39 of the covering plans require prior authorization (0.7%), 0 step therapy and 633 a quantity limit.
920 covering plans charge a flat copay for a 30-day supply at a preferred retail pharmacy after the deductible — median $42, 269 of them $0; 4,295 charge coinsurance instead — median 25% of the drug's cost. Covered insulin is capped at $35 for a month's supply.
2025: 5,479 of 5,631 plans covered it (97.3%); 2026: 5,215 of 5,496 (94.9%).
Of 4,368 plans offered in both years, 16 added it to the formulary and 131 dropped it.
Among plans covering it both years, 781 moved it to a higher tier and 39 to a lower one; 18 added prior authorization and 0 removed it.
Medicare Part D paid for 555,716 30-day fills of Humulin R in 2024 for about 86,983 enrollees, at an average total cost of $437.22 per 30-day fill (CMS Part D Prescribers by Geography and Drug, national).
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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.