Step therapy is a plan requirement that you try one or more lower-cost drugs before it will cover the medication your prescriber actually chose. The industry name for it is “fail first,” which describes the mechanism accurately: coverage of the second drug is unlocked by the first one not working.

It is not a clinical judgement about you. It is a rule applied to a drug class, and the plan does not know your history unless somebody tells it.

That is why the exception matters more than the rule. If you have already taken the required drug, the exception exists for exactly your situation, and it turns on facts your prescriber can document: which drug, roughly when, and what happened. Approximate months are far better than leaving the history out.

In New York: two rules limit where step therapy can operate at all, and both are worth knowing in the same breath. For substance use disorder, a policy covering prescription drugs must provide immediate access without prior authorization to medications on the state list, so there is no step to fail first. And since April 1, 2023 Medicaid pharmacy runs through NYRx statewide, which means the rules a Medicaid member faces are the same in every county rather than differing plan by plan, and a denial reason you look up will actually match your own.

The practical order when a pharmacy rejects a prescription for step therapy: get the rejection wording from the pharmacist, ask the pharmacy for an emergency supply, and call the prescriber’s office with the dates of what you already tried. Only the prescriber can submit the exception.

Also called: fail first, step protocol. Full guide: What to do when the plan will not cover the drug.

More in Glossary of health coverage and billing terms

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  • Formulary — A formulary is a plan's list of covered drugs, sorted into tiers that set your cost. What on-formulary means, how exceptions work, and New York's NYRx list.

This page explains how the system works. It is not medical advice. More.