A formulary is the list of medications your plan covers, usually organized into tiers that determine your cost. Drugs left off the formulary may require a special exception request to be covered. Formularies change over time, so a medication covered last year may move tiers or drop off entirely.
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Disclaimer: This definition is provided for general educational purposes only and is not legal, medical, or insurance advice. Insurance rules, deadlines, and terminology vary by plan, state, and over time. Always check your own plan documents and confirm current details before acting.