This case presents the following question: whether federal courts must defer to an agency's reasonable interpretation of its own regulations (commonly referred to as "Auer deference"), as the Court of Appeals did here with respect to a claim by Unity HealthCare, a rural, non-profit acute care hospital, for a "volume decrease adjustment" provided for under the Medicare statute, 42 U.S.C. § 1395ww(d)(5)(D)(ii), and regulations promulgated by the Secretary of Health & Human Services, 42 C.F.R. § 412.92(e)(3).

Whether federal courts must defer to an agency's reasonable interpretation of its own regulations