; (2) in subparagraph (G), by striking at the end and ; (3) in subparagraph (H), by striking the period at the end and inserting ; and ; and (4) by adding at the end the following new subparagraph: (I) ensure that, beginning January 1, 2019— (i) in the case of health benefits that are established as essential health benefits, there shall not be substitution of such benefits across benefit categories; (ii) a qualified health plan shall not be treated as providing coverage for the essential health benefits unless under such plan— (I) coverage of prescription drugs provides for access to a wide variety of classes of drugs within the prescription drug formulary of such plan; and (II) in the case that a drug that is medically necessary for an enrollee under such plan is not included within such formulary, such individual has access to such drug through an exceptions process established by the plan