Step Therapy, according to the Centers for Medicare and Medicaid (CMS) is defined as:
In some cases, plans require you to first try one drug before they will cover another drug for that condition. For example, if Drug A and Drug B both treat your medical condition, a plan may require your doctor to prescribe Drug A first. If Drug A does not work for you, then the plan will cover Drug B.
(source: Medicare.gov)
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