Health Insurance
Drug Tier
Drug tiers rank medications from cheapest (generics) to most expensive (specialty drugs), with your copay or coinsurance rising as tiers increase.
Last reviewed: May 2026 · Editorial methodology
Definition
Drug tiers are the cost-sharing categories that health insurers and Medicare Part D plans use to organize formulary medications. Most plans use four to six tiers: Tier 1 covers preferred generic drugs with the lowest copays (often $0–$15), Tier 2 covers non-preferred generics, Tier 3 covers preferred brand-name drugs, Tier 4 covers non-preferred brand-name drugs, and Tier 5 or higher covers specialty biologics — which can require coinsurance of 25–33% per fill rather than a flat copay. Specialty medications on top tiers can cost hundreds or thousands of dollars per fill without assistance programs. If your drug is on a higher tier, you can ask your prescriber to request a formulary exception, which asks the insurer to cover the drug at a lower tier cost-sharing level if no therapeutically equivalent lower-tier option exists. Manufacturer copay assistance cards cannot be used with Medicare plans, but Extra Help and other programs can significantly reduce specialty drug costs for eligible Medicare members. Always check tier placement and quantity limits before starting a new high-cost medication.
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Cover Forge USA Editorial Team
Editorial Lead
This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.
Reviewed 2026-06-14
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