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8 ." §§4980D(a)–(b). And if the employer decides to stop providing health insurance altogether and at least one full-time employee enrolls in a health plan and qualifies for a subsidy on one of the government-run ACA exchanges, the employer must pay $2,000 per year for each of its full-time employees. §§4980H(a), (c)(1).

Unless an exception applies, ACA requires an employer's group health plan or group-health-insurance coverage to furnish "preventive care and screenings" for women without "any cost sharing requirements." 42 U. S. C. §300gg–13(a)(4). Congress itself, however, did not specify what types of preventive care must be covered. Instead, Congress authorized the Health Resources and Services Administration (HRSA), a component of HHS, to make that important and sensitive decision. Ibid. The HRSA in turn consulted the Institute of Medicine, a nonprofit group of volunteer advisers, in determining which preventive services to require. See [http://www.gpo.gov/fdsys/search/citation.result.FR.action?federalRegister.volume=2012&federalRegister.page=8725&publication=FR 77 Fed. Reg. 8725–8726 (2012)].

In August 2011, based on the Institute's recommendations, the HRSA promulgated the Women's Preventive Services Guidelines. See id., at 8725–8726, and n. 1; online at http://hrsa.gov/womensguidelines (all Internet materials as visited June 26, 2014, and available in Clerk of Court's case file). The Guidelines provide that nonexempt employers are generally required to provide "coverage, without cost sharing" for "[a]ll Food and Drug Administration [(FDA)] approved contraceptive methods, sterilization procedures, and patient education and counseling." 77 Fed. Reg. 8725 (internal quotation marks omitted). Although many of the required, FDA-approved methods of contraception work by preventing the fertilization of an egg, four of those methods (those specifically at issue in these cases) may have the effect of preventing an already fertilized egg from developing any further by inhibiting its attachment to the uterus. See Brief for HHS