On March 31, 2015, the Supreme Court decided in Armstrong v. Exception Child Center, Incorporated , that private parties cannot seek an injunction from a federal court to prevent state Medicaid officials from implementing a state plan that may violate federal law. This report provides an overview of the decision in Armstrong , the potential implications of this decision for Medicaid, and the availability of equitable relief against state officers in federal courts generally. Medicaid is a cooperative federal-state program through which the federal government provides financial assistance to states for medical care and other services for poor, elderly, and disabled individuals. Although participation in the Medicaid program is voluntary, states, as a condition of participation, are required to have a plan that complies with federal Medicaid statutes and regulations in order to qualify for federal assistance. Nevertheless, states have considerable discretion in administering their Medicaid programs, which generally includes setting the payment rates at which providers are reimbursed for their services to Medicaid beneficiaries. In the context of these rate-setting determinations, providers and others have argued that reductions make reimbursement rates inadequate and have turned to the courts to challenge these reductions. When challenging these reimbursement rates, plaintiffs have often claimed that the rates violate the requirements of Section 1902(a)(30)(A) of the Social Security Act, often referred to as Medicaid's "equal access provision." This provision requires a state Medicaid plan to provide such methods and procedures relating to the utilization of, and the payment for, care and services available under the plan…as may be necessary to safeguard against unnecessary utilization of such care and services and to assure that payments are consistent with efficiency, economy, and quality of care and are sufficient to enlist enough providers so that care and services are available under the plan at least to the extent that such care and services are available to the general population in the geographic area .... Medicaid beneficiaries and others have claimed that because of inadequate Medicaid reimbursement rates, the requirements of the equal access provision are not met (e.g., the state did not consider, or the state plan's methods or procedures do not assure, that Medicaid payments are consistent with efficiency, economy, and quality of care, or are sufficient to enlist providers to provide Medicaid services). In other words, plaintiffs have generally argued that the provider reimbursement rates are so low that they do not allow for sufficient care and services to be provided to beneficiaries, as compared to the care in that area that is available to individuals who do not participate in the Medicaid program. In determining whether a state's provider reimbursement rates violate the equal access provision, a significant threshold question arises in these cases: whether private parties can sue to enforce these federal requirements. Because the Medicaid Act contains no express language that allows private parties to challenge reimbursement rate cuts, plaintiffs desiring to challenge cuts in Medicaid payment rates under the equal access provision have sought out other legal vehicles to bring their claims. Historically, plaintiffs had brought their claims under 42 U.S.C. § 1983, which allows individuals to sue local governments and state and local officers in order to redress violations of federal law. Based on this cause of action, plaintiffs have alleged that state Medicaid officials violated their federal rights because the reimbursement rates did not comply with the requirements of the equal access provision. Multiple courts found that Medicaid providers and beneficiaries could enforce the equal access provision by bringing an action under Section 1983. However, in 2002, the Supreme Court's decision in Gonzaga University v. Doe restricted plaintiffs' ability to bring an action under Section 1983. As the Court explained in Gonzaga , "we now reject the notion that our cases permit anything short of an unambiguously conferred right to support a cause of action brought under Section 1983." In the wake of Gonzaga , most appellate courts held that the equal access provision is not privately enforceable under Section 1983. Thus, in light of the Gonzaga decision, Medicaid providers and beneficiaries have sought other legal avenues for challenging Medicaid reimbursement rates. Plaintiffs have also sought to enforce federal laws against state officials through an equitable cause of action first recognized by the Supreme Court in Ex parte Young , under which "federal courts may in some circumstances grant injunctive relief against state officers who are violating, or planning to violate, federal law." In Young , the Court upheld a federal circuit court's order enjoining the Minnesota attorney general from enforcing railroad rates set by a state commission under Minnesota law. The basis for the injunction in this case was the determination that the Minnesota railroad rate scheme violated the Dormant Commerce Clause, and was therefore unconstitutional. Although actions under Ex parte Young are frequently permitted, the Court has found that the availability of an equitable remedy had been foreclosed by Congress. In Seminole Tribe of Florida v. Florida , the Court noted that "where Congress has prescribed a detailed remedial scheme for the enforcement against a State of a statutorily created right, a court should hesitate before casting aside those limitations" and permitting an action against a state officer based upon Ex parte Young. Therefore, the fact that Congress had specified a detailed process by which tribes were to enforce their rights against a state under the Indian Gaming Regulatory Act (IGRA) indicated that Congress intended to preclude tribal litigants from seeking to enforce those same provisions through Ex parte Young. Following the narrowing of Section 1983 remedies in the wake of Gonzaga , private plaintiffs have sought to enjoin state officials that they believe are in violation of federal Medicaid requirements under Ex parte Young . In 2012, the Supreme Court had the opportunity to consider the availability of such a remedy in Douglas v. Independent Living Center of Southern California . While the case was pending, the Centers for Medicare and Medicaid Services (CMS) approved the modifications to California's Medicaid program. In light of this "different posture," a majority of the Court voted to remand the case to the Ninth Circuit to determine what effect, if any, the administrative action should have on the question of whether a cause of action is available under the Supremacy Clause. Four Justices dissented from the majority opinion. In the dissent's view, the administrative actions by CMS "have no impact on the question" of the availability of a cause of action under the Supremacy Clause. Upon reaching that question, the dissent would have held that the Supremacy Clause does not provide an independent cause of action where Congress has declined to provide a private right of action to enforce a federal statute. During the October 2014 term, the Supreme Court was again presented with the question posed by Douglas , namely, whether the Supremacy Clause independently provides a cause of action to prevent state officials from violating a federal statute. The facts of this case, Armstrong v. Exceptional Child Center, Incorporated , are similar to the facts of Douglas . In Armstrong , Idaho's reimbursement rates for providers of "habilitation services" were challenged by providers of these services. As in Douglas , the Armstrong plaintiffs argued that the rates were in violation of the equal access provision required under Medicaid. However, in contrast to Douglas , Idaho's rates had already received approval from CMS. Therefore, Armstrong presented an opportunity for the Court to squarely address the question presented in Douglas , but without the risk of intervening administrative action requiring a remand to the lower courts. In answer to that question, a majority of the Court held that the Supremacy Clause did not provide a cause of action for private parties to enforce the Medicaid equal access requirement. While recognizing that federal courts are empowered to enjoin state enforcement actions that are preempted by federal law, the majority held that this power is not derived from the Supremacy Clause, but from courts' inherent equitable powers. The Supremacy Clause merely provides a "rule of decision" when courts are confronted with a conflict between state and federal law. But, the authority to resolve that conflict must come from another source, such as a statutory cause of action created by Congress or the equitable powers of the judiciary. With respect to whether the courts could enjoin Idaho's implementation of its Medicaid rates as a form of equitable relief, the majority found that Congress had foreclosed such an option for the plaintiffs. This holding was grounded on two main observations. First, a separate enforcement mechanism had been provided by Congress in the form of the withholding of federal funds from a noncompliant state Medicaid plan. Second, the majority found the terms of the equal access provision to be judicially unadministrable. In particular, the majority stated, It is difficult to imagine a requirement broader and less specific than §30(A)'s mandate that state plans provide for payments that are "consistent with efficiency, economy, and quality of care," all the while "safeguard[ing] against unnecessary utilization of . . . care and services." Explicitly conferring enforcement of this judgment-laden standard upon the Secretary alone establishes, we think, that Congress "wanted to make the agency remedy that it provided exclusive," thereby achieving "the expertise, uniformity, widespread consultation, and resulting administrative guidance that can accompany agency decisionmaking," and avoiding "the comparative risk of inconsistent interpretations and misincentives that can arise out of an occasional inappropriate application of the statute in a private action." Four Justices dissented in Armstrong , arguing that while the Supremacy Clause may not provide the plaintiffs with a cause of action, the evidence of congressional intent to foreclose equitable relief was insufficient. In particular, the dissent argued that the agency enforcement mechanism in Medicaid was not the type of "detailed remedial scheme" that had previously been relied upon by the Court to deny equitable relief. In addition to concerns about the weight given to alternative enforcement mechanisms in this case, the dissent may also have disagreed with the burden the majority required the plaintiffs to meet before they would be allowed to seek equitable relief. Specifically, the dissent observed that equitable preemption actions differ from suits brought by plaintiffs invoking 42 U. S. C. §1983 or an implied right of action to enforce a federal statute. Suits for "redress designed to halt or prevent the constitutional violation rather than the award of money damages" seek "traditional forms of relief."