 The standard benefit is defined in terms of the benefit structure and without mandating the drugs that must be covered.For example, in 2013, the standard benefit required payment by the beneficiary of a $325 deductible, then required 25% coinsurance payment by the beneficiary of drug costs up to an initial coverage limit of $2,970 (the full retail cost of prescriptions).Once this initial coverage limit is reached, the beneficiary had to pay the full cost of his/her prescription drugs up until the total out-of-pocket expenses reached $4,750 (excluding premiums and any expense paid by the insurance company) minus a 52.5% discount in this gap, referred to as the "Donut Hole".