Formulary Exception

A formulary exception is a formal request to a health plan to cover a drug that is either not on the plan's formulary at all (a non-formulary exception) or to cover it at a lower cost-sharing tier than it's listed at (a tier exception). When a physician prescribes a medication that the plan doesn't cover or covers only at a high tier, the member or prescribing physician can request an exception — typically by submitting clinical documentation explaining why the excluded or high-tier drug is medically necessary when formulary alternatives won't work.

The most common exception requests involve: a drug that was on formulary last year but was removed at renewal, a specialty drug that's on formulary but listed at Tier 4 or 5 with cost-sharing the member can't afford, a situation where formulary alternatives have already been tried and failed, or a contraindication to formulary alternatives. Under the ACA and various state laws, plans must have an exceptions process and must respond to urgent requests within 24 to 72 hours and standard requests within 72 hours. Denials must include specific reasons and information about the appeals process. The clinical justification is the key document — a letter from the prescribing physician explaining the medical necessity, documenting any failed alternative treatments, and citing clinical evidence supporting the requested drug significantly improves approval rates compared to a generic request form. Generic substitution and step therapy requirements can be challenged through the exceptions process when the required first-step drug is clinically inappropriate for the specific patient.

The takeaway: if a drug is denied because it's not on formulary or is listed at an unaffordable tier, don't accept the denial as final. Have your physician submit a formulary exception request with specific clinical justification. Approval rates for well-documented exception requests are meaningfully higher than for generic appeals, and a successful exception can save thousands of dollars per year in out-of-pocket drug costs.