How Copayment Amounts Apply. If the Allowable Amount of the drug is less than the Copayment, You pay the lower cost. When that lower cost is more than the amount You would pay if You purchased the drug without using Your HMO pharmacy benefits or any other source of drug benefits or discounts, You pay such purchase price. You How Member Payment is Determined. Prescription drug products are separated into tiers. Generally, each drug is placed into one of six drug tiers:
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