; and (ii) the cost to the consumer for acquisition of the drug without using any health plan. . 3. Requirements with respect to prescription drug cost-sharing Subpart II of part A of title XXVII of the Public Health Service Act ( 42 U.S.C. 300gg–11 et seq.) is amended by adding at the end the following: 2729A. Requirements with respect to prescription drug cost-sharing (a) Credit towards deductible With respect to any enrollee in a health plan or individual or group health insurance coverage who pays out-of-pocket for the full cost of a prescription drug, the group health plan or health insurance issuer offering such health insurance coverage shall credit the full amount such enrollee paid for such drug towards any deductible under the plan or coverage applicable to prescription drugs. (b) Establishment of co-Payments for certain prescription drugs (1) In general A group health plan or a health insurance issuer offering group or individual health insurance coverage shall, not later than 60 days before the first annual open enrollment period after the date of enactment of the Transparent Drug Pricing Act of 2019 , and 60 days before each annual open enrollment period thereafter, publish a list of the co-payment amounts for the applicable plan year with respect to each prescription drug covered under the plan or coverage. (2) Prohibition on changes in co-payment amounts A group health plan or health insurance issuer described in paragraph (1) may not change the co-payment amount published in accordance with paragraph (1) until the next plan year. (3) Calculation of out-of-pocket costs A group health plan or a health insurance issuer offering group or individual health insurance coverage shall provide a mechanism that enables enrollees in the plan or coverage to determine the projected total out-of-pocket costs of an enrollee in the plan or coverage for each prescription drug covered under such plan or coverage. . 4. International retail list price index (a) In general The retail list price in the United States for