Whether Chevron deference permits HHS to set reimbursement rates based on acquisition cost and vary such rates by hospital group if it has not collected adequate hospital acquisition cost survey data

QUESTION PRESENTED Under federal law, the reimbursement rate paid by Medicare for specified covered outpatient drugs is set based on one of two alternative payment methodologies. Ifthe Department of Health and Human Services (HHS) has collected adequate “hospital acquisition cost survey data,” it sets the reimbursement rate equal to the “average acquisition cost for the drug,” and “may vary’ that rate “by hospital group.” 42 U.S.C. If HHS has not collected adequate “hospital acquisition cost data,” it must set a reimbursement rate equal to the “average price for the drug,” which is “calculated and adjusted by [HHS] as necessary for purposes of” the statute. 42 U.S.C. 13951(t)(14)(A)Gii) (ID. The question presented is whether Chevron deference permits HHS to set reimbursement rates based on acquisition cost and vary such rates by hospital group if it has not collected adequate hospital acquisition cost survey data.