The Medicare Shared Savings Program (MSSP) is a major framework through which Medicare incentivizes healthcare providers to coordinate care for Medicare beneficiaries, reduce unnecessary spending, and improve quality. By forming Accountable Care Organizations (ACOs) within MSSP, clinicians and hospitals collaborate to deliver more efficient, higher‑quality care. This article explains what MSSP is, how it operates, the metrics used to measure success, and practical considerations for providers and patients alike.
What Is the Medicare Shared Savings Program?
The Medicare Shared Savings Program is a Centers for Medicare & Medicaid Services (CMS) initiative that supports the creation of ACOs. An ACO is a network of doctors, hospitals, and other health care providers that collectively assumes responsibility for the cost and quality of care for a defined population of Medicare beneficiaries. If the ACO reduces spending relative to a national benchmark while meeting quality performance standards, it earns a portion of the savings as a shared savings payment. If performance falls short, the ACO may not receive a shared savings payment and could incur losses in some configurations.
What Is an Accountable Care Organization (ACO)?
An ACO is a group of providers who coordinate care to ensure that patients receive appropriate, timely, and high‑quality services. ACOs under MSSP can include physicians, mid‑level providers, hospitals, and other entities that enroll as a legal organization with CMS. The emphasis is on care coordination, preventive care, and efficient management of chronic conditions. ACOs must meet specific governance requirements and demonstrate transparent population management and data sharing among participating providers.
How MSSP Works
In MSSP, CMS sets financial benchmarks for each ACO based on historical spending and case mix for its assigned Medicare population. The ACO is accountable for total Medicare spending for that population across all care settings. If actual spending is below the benchmark and quality performance targets are met, the ACO shares in the savings. If spending is not reduced or quality targets are not met, the ACO may receive reduced payments or be at risk for losses depending on the program variant and contract terms.
Key design features include:
- Shared savings mechanism: A portion of savings is distributed to the ACO participants, with a portion typically reserved for reinvestment in care coordination and population health activities.
- Quality performance requirements: ACOs must meet performance metrics in areas such as patient experience, care coordination, preventive health, and at‑risk population management.
- Flexibility in approach: MSSP offers multiple tracks with different levels of risk and potential reward, allowing organizations to choose the model that fits their capabilities while maintaining patient care quality.
- Data and governance: ACOs rely on CMS data, internal records, and shared governance to monitor spend, outcomes, and member engagement.
Quality and Financial Metrics
Quality metrics in MSSP typically cover four domains: patient/caregiver experience, care coordination and patient safety, preventive health, and at‑risk population health. Examples include diabetes and hypertension control rates, screen completion, Hospital Readmissions Reduction Program (HRRP) alignment, and patient experience surveys. Financial benchmarks are updated annually and consider factors such as regional cost variations and patient complexity. Meeting both cost and quality targets is essential to earned shared savings and to avoiding downside risk in certain tracks.
CMS also emphasizes care transition measures, medication management, and appropriate utilization of services. Providers are encouraged to invest in health information technology, care management teams, and patient engagement tools to improve performance.
How to Join MSSP
Eligible providers and organizations can apply to form an ACO and participate in MSSP. Steps generally include:
- Assess readiness for care coordination, data analytics, and risk arrangement.
- Form or join an ACO with a legal structure that meets CMS requirements.
- Submit an application to CMS and select an MSSP track that aligns with risk tolerance and strategic goals.
- Put governance, compliance, data sharing, and care management processes in place.
- Engage primary care practices and other clinicians to participate in coordinated care plans.
Participation involves ongoing data reporting, performance monitoring, and adherence to program rules. Organizations should conduct thorough cost‑benefit analyses and consider potential downside risk when selecting a track.
Pros and Cons of the MSSP
Pros include:
- Financial incentives: Potential for shared savings when cost and quality targets are met.
- Care coordination: Structured processes to manage high‑need patients and reduce duplicative services.
- Quality improvement focus: Emphasis on preventive care and patient experience.
Cons include:
- Risk of losses: Some tracks expose participants to potential financial losses if spending exceeds benchmarks or quality targets are not met.
- Implementation burden: Requires robust data analytics, reporting, and care management infrastructure.
- Variable results: Savings depend on patient mix, regional costs, and practice readiness, so outcomes vary across ACOs.
Examples and Trends
Since its inception, MSSP has grown to include a diverse range of ACOs—from large hospital systems to physician‑led groups. Trends show increasing emphasis on population health, social determinants of health, and value‑based care alignment. Some ACOs have achieved meaningful savings and quality improvements by investing in care coordinators, advanced analytics, and integrated health IT systems. Other organizations have faced challenges, highlighting the importance of governance, risk management, and stable physician engagement.
How MSSP Differs From Other Programs
Compared with other value‑based arrangements, MSSP emphasizes shared savings tied to measuring both cost and quality without mandatory downside risk in some tracks. Other programs may impose stricter financial risk, alternative payment models, or different quality sets. For patients, MSSP aims to keep care patient‑centered and coordinated, reducing duplicative tests and ensuring follow‑up after hospital stays. For providers, MSSP offers a pathway to align care with reimbursement, while maintaining clinical autonomy within CMS rules.
Practical Considerations for Patients and Providers
For patients, choosing a care team that participates in MSSP can mean better care coordination, clearer communication, and a focus on preventive services. Patients should ask their primary care physician whether their practice is part of an ACO and how care plans are managed across settings. For providers, success in MSSP hinges on strong data governance, scalable care management, and alignment of incentives across the care continuum. Leaders should prioritize interoperable health IT, clearly defined roles for care managers, and ongoing performance review cycles.
Future Outlook for the MSSP
CMS continues to refine MSSP rules to balance financial risk with patient outcomes. Expected trends include expanding the pool of eligible providers, refining quality metrics to reflect modern care delivery, and promoting innovations in care coordination, telehealth, and chronic disease management. The program’s evolution will likely favor more sophisticated risk models and greater emphasis on patient engagement and social determinants of health as levers for savings and quality gains.