Formulary Tier
A category within an insurance formulary that determines how much a patient pays out of pocket for a drug — lower tiers mean lower costs.
How It Works
Most Part D plans use 5 tiers: Tier 1 (preferred generics, lowest copay — often $0-10), Tier 2 (non-preferred generics), Tier 3 (preferred brands), Tier 4 (non-preferred brands), and Tier 5 (specialty drugs, often 25-33% coinsurance). The tier a drug is placed on depends on negotiations between the PBM and the manufacturer. A brand-name drug with large rebates may land on a lower tier than a competitor with smaller rebates, even if its list price is higher. Patients can sometimes request a tier exception if a lower-tier alternative doesn't work for them.
Related Terms
- Formulary — A list of prescription drugs covered by an insurance plan, organized into tiers that determine how much the patient pays for each drug.
- Out-of-Pocket Cost — The amount a patient pays directly for a prescription drug — including copays, coinsurance, and deductible payments.
- Pharmacy Benefit Manager (PBM) — A company that acts as a middleman between drug manufacturers, insurers, and pharmacies — negotiating drug prices, managing formularies, and processing claims.
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About This Definition
This definition is part of the DrugPrice Drug Pricing Glossary — 34 terms explaining how prescription drug pricing works in the United States. All definitions are written in plain language for patients, caregivers, journalists, and healthcare professionals.