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Humulin is a brand of insulin isophane / 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, 2,311 of 5,496 Medicare Part D and Medicare Advantage drug plans (42%) list Humulin on their formulary, across 177 of 328 formularies. The most common placement is tier 3 (2,034 plans, 88% of those covering it). 8 of the covering plans require prior authorization (0.3%), 0 step therapy and 403 a quantity limit.
734 covering plans charge a flat copay for a 30-day supply at a preferred retail pharmacy after the deductible — median $45, 209 of them $0; 1,577 charge coinsurance instead — median 20% of the drug's cost. Covered insulin is capped at $35 for a month's supply.
2025: 3,509 of 5,631 plans covered it (62.3%); 2026: 2,311 of 5,496 (42%).
Of 4,368 plans offered in both years, 57 added it to the formulary and 845 dropped it.
Among plans covering it both years, 14 moved it to a higher tier and 21 to a lower one; 0 added prior authorization and 0 removed it.
Medicare Part D paid for 993,829 30-day fills of Humulin in 2024 for about 139,542 enrollees, at an average total cost of $102.04 per 30-day fill (CMS Part D Prescribers by Geography and Drug, national).
Price Humulin and the rest of a client's list on every plan in their county.
Estimate Humulin 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.