1. Short title This Act may be cited as the Know the Cost Act of 2018 . 2. Prohibition on limiting certain information on drug prices (a) In general (1) Group health plans and health insurance issuers 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: 2729. Information on prescription drugs (a) In general A group health plan or a health insurance issuer offering group or individual health insurance coverage shall— (1) not restrict, directly or indirectly, any pharmacy that dispenses a prescription drug to an enrollee in the plan or coverage from informing (or penalize such pharmacy for informing) an enrollee of any differential between the enrollee's out-of-pocket cost under the plan or coverage with respect to acquisition of the drug and the amount an individual would pay for acquisition of the drug without using any health plan or health insurance coverage