42 U.S.C. 1315: Federal Waiver Authority Explained

Section 1115 of the Social Security Act, codified at 42 U.S.C. § 1315, gives the U.S. Department of Health and Human Services authority to approve certain state demonstration projects. The law is best known for Medicaid Section 1115 demonstrations, which let states test approaches that may not fit ordinary federal Medicaid rules. These projects can affect eligibility, benefits, delivery systems, and how services are paid for—but the authority is limited, and federal approval comes with conditions.

What 42 U.S.C. § 1315 Authorizes

Section 1315 is the federal statute commonly called Section 1115, after its location in the Social Security Act. It authorizes the HHS Secretary to approve experimental, pilot, or demonstration projects that, in the Secretary’s judgment, are likely to help promote the objectives of specified federal health programs. The statute covers demonstrations connected with Medicare, Medicaid, and the Children’s Health Insurance Program (CHIP), although Medicaid is the most frequent use.

For Medicaid and CHIP, the authority has two important parts. The Secretary may waive certain requirements of Medicaid law and may permit federal matching funds for some demonstration expenditures that would not otherwise qualify for federal reimbursement. This gives states flexibility to test a policy while keeping the program within the boundaries of federal law and the approved demonstration.

A Section 1115 approval is not a permanent change to the Medicaid statute. It is a time-limited agreement between the federal government and a state, subject to approved terms, spending limits, monitoring, and evaluation. States administer Medicaid, but the federal government helps fund it and oversees compliance with federal requirements.

How Section 1115 Differs From a Standard Medicaid State Plan

Each state operates Medicaid under a federally approved state plan. The plan describes how the state meets federal requirements, including rules for eligibility, covered services, and program administration. States can make many changes through state-plan amendments, or SPAs, without seeking a Section 1115 waiver when the change complies with ordinary Medicaid law.

A demonstration is different because it can allow departures from specified requirements or authorize qualifying demonstration spending. For instance, a state might seek to test a new delivery model or a different approach to benefits for a defined group. The state must identify the statutory flexibility it needs and explain how the project advances Medicaid’s objectives. A waiver cannot simply disregard federal law: the Secretary can waive only requirements within the authority Congress granted, and every project remains subject to its approval conditions.

Some Medicaid rules are commonly addressed through Section 1115 demonstrations, while others may be unavailable for waiver or subject to specific legal protections. The answer depends on the provision, the proposal, and the terms of federal law. States and readers should consult the statute, current CMS guidance, and the actual approval documents rather than assume that any particular requirement can be waived.

What States Use Medicaid Demonstrations to Test

Section 1115 projects vary widely. They may apply statewide or to particular populations, services, or regions. Common areas include care delivery, behavioral health, coverage design, and services intended to address needs that affect health outside a clinical setting. Examples of demonstration approaches include:

• Managed care and care coordination: Testing ways to organize services, coordinate providers, or improve continuity of care.
• Behavioral health: Developing or expanding approaches to mental health and substance use disorder treatment, subject to federal coverage and program rules.
• Eligibility and enrollment: Testing certain enrollment or coverage policies where federal law allows the requested flexibility.
• Benefits and cost sharing: Seeking approval for changes to benefit design or beneficiary contributions, within applicable legal limits.
• Health-related social needs: Testing approved services or supports—such as certain housing-related or nutrition-related interventions—when CMS determines they meet the demonstration’s requirements.
• Delivery-system reform: Paying providers or organizations through models intended to improve quality, access, or coordination.

These examples describe broad categories, not automatic permissions. A state proposal must be reviewed on its own merits. For example, approval of a housing-related service in one state does not mean that every housing expense is a Medicaid-covered service in every state.

Federal Review and the Approval Process

A state usually develops a proposal with its Medicaid agency and submits it to the Centers for Medicare & Medicaid Services (CMS), an agency within HHS. The submission describes the project’s goals, affected populations, requested waivers or expenditure authority, operational plans, financing, evaluation strategy, and expected results. The level of detail depends on the project and the applicable federal requirements.

Public involvement is part of the process. Federal rules require public notice and opportunities for comment for many new demonstrations and significant changes. States also have notice and consultation duties, including processes that may involve tribal governments where applicable. CMS reviews the state’s proposal, may request revisions, and considers public comments before making a decision. Review timelines can vary with the project’s complexity and the completeness of the application.

If CMS approves a project, the approval generally includes a set of special terms and conditions, often called STCs. These documents specify what the state may do, reporting and monitoring obligations, evaluation requirements, and other conditions. The approval letter, STCs, expenditure authorities, and related attachments are essential for understanding the actual scope of a demonstration.

Budget Neutrality and Federal Spending

Medicaid is jointly financed by the federal government and states. For ordinary Medicaid services, federal matching funds are generally available under statutory rules. A Section 1115 demonstration may seek federal funding for expenses that would not otherwise qualify, but that spending must be approved. CMS also applies a budget-neutrality policy to Medicaid demonstrations: the project is generally expected not to increase federal spending compared with an estimated no-demonstration baseline.

Budget neutrality is an important feature of federal review, but it is not a simple guarantee that a project will cost less or save money in practice. States and CMS use projections, assumptions, and expenditure limits to establish and track the financial terms. Actual costs can differ from forecasts, so approved demonstrations often include monitoring, reporting, and rules for how spending is reconciled. The specific method and limits are set out in the demonstration’s financial documents and STCs.

Federal funding also does not mean that every state expense is reimbursable. An expenditure must fit within the approved authority and comply with the applicable terms. CMS can require corrective action or otherwise respond if the state does not meet its obligations.

Approval Periods, Extensions, and Changes

Section 1115 demonstrations are approved for a defined period rather than indefinitely. Many Medicaid demonstrations receive an initial approval lasting several years, but the term depends on the project and federal decision. States seeking to continue a demonstration generally submit an extension request and undergo federal review. Approval of an extension is not automatic.

States may also request amendments during a demonstration. A proposed change can trigger additional review, public notice, and updated terms. CMS may approve a request as submitted, approve it with conditions, ask for revisions, or decline it. When an approval expires or a project ends, the state may need to return to standard federal Medicaid rules, obtain a new approval, or adopt a change through another legally available route.

Evaluation, Reporting, and Accountability

Demonstrations are intended to test approaches, so evaluation is central to the authority. States generally must submit an evaluation plan and later report findings. Evaluations may examine whether the project met its goals, how it affected access and quality, and what it cost. The design should match the policy question: a project testing care coordination, for example, needs measures that can assess coordination and health outcomes rather than relying only on enrollment figures.

CMS may require regular progress reports, financial monitoring, beneficiary protections, and public access to certain project materials. The exact requirements vary by demonstration. States also remain responsible for implementing approved policies in accordance with federal civil rights protections, applicable Medicaid requirements, and the terms of the approval.

Evaluation results can inform later federal and state decisions, but they do not automatically establish that a policy should be adopted nationwide. Demonstrations can differ in populations, provider networks, state systems, and implementation conditions. Results should be read alongside the evaluation method and the project’s approved scope.

Important Limits and Common Misunderstandings

• A waiver is not a blanket exemption. It applies only to specified requirements and activities described in the approval.
• CMS approval does not rewrite the statute. The demonstration is time-limited and operates under delegated federal authority.
• States cannot use Section 1115 to waive any rule they choose. The Secretary’s authority is limited by the statute and other federal laws.
• Federal matching funds are not automatic. Expenditures must be authorized, properly documented, and consistent with approval terms.
• A demonstration in one state does not set a nationwide rule. Other states need their own legal authority and, where required, federal approval.
• Approval does not guarantee a policy’s effectiveness. Outcomes depend on implementation and should be assessed through evidence.

One frequent source of confusion is the word “waiver.” A Section 1115 demonstration may waive certain Medicaid requirements, but it does not waive the entire Medicaid program or remove all federal oversight. Another is the assumption that a state can continue a policy simply because CMS approved it once. Demonstrations have terms and expiration dates, and extensions or amendments require federal action.

How to Find and Read a Section 1115 Approval

CMS publishes state demonstration materials through its Medicaid Section 1115 Demonstrations resources. A useful review starts with the current approval letter and STCs, then checks the application, amendment documents, evaluation plan, monitoring reports, and financial materials. Older documents can help explain a project’s history, but they may not reflect its current terms.

When reading an approval, look for the demonstration’s dates, covered populations, geographic scope, requested waivers, expenditure authorities, spending limits, and reporting obligations. The state’s public notice and CMS decision documents can clarify what was proposed, what changes were made during review, and how public feedback was addressed.

For legal questions, the controlling sources are the current text of 42 U.S.C. § 1315, relevant provisions of the Social Security Act and federal regulations, and the project-specific CMS approval. CMS guidance can explain agency policy, while the state’s Medicaid agency can provide information about local implementation. Because approvals and laws can change, older summaries should not substitute for current documents.

Why Section 1115 Matters

Section 1115 gives states a structured way to test changes to major public health coverage programs while preserving federal review. Its flexibility can support new care models and targeted services, but it also raises questions about cost, access, evidence, and accountability. Understanding the statute means looking beyond the label “waiver” to the precise authority requested, the conditions CMS imposed, and the results the demonstration is designed to measure.