What is a formulary and how does it influence prescribing in a managed care plan?

• A. A formulary is a list of reviewed medical procedures; it guides surgical coding.
• B. A formulary is a type of billing form used for prescription claims.
• C. A formulary is a list of approved medications; plans prefer drugs on the formulary to control costs and ensure coverage.
• D. A formulary is a personal diary of a patient’s medications.

Answer: (C)

In managed care, a formulary is a curated list of medications that the plan covers. The plan reviews drugs for efficacy, safety, and cost, and then negotiates with manufacturers to get preferred pricing for those on the list. Because of this, prescribing is guided toward formulary drugs to ensure coverage and keep costs predictable. If a clinician prescribes a non-formulary medication, it often requires prior authorization, higher patient copays, or a formulary exception.

In short, the formulary acts as the plan’s approved catalog of medications, shaping what patients can access at standard costs and nudging prescribers toward cost-effective, covered options.