MSSP Calculation Tool (ACO-27)
Estimate your Medicare Shared Savings Program savings potential under the ACO-27 model
Your MSSP Savings Results
Comprehensive Guide to MSSP Calculation Under ACO-27
The Medicare Shared Savings Program (MSSP) under the ACO-27 model represents a significant evolution in value-based care. This guide provides healthcare executives, ACO administrators, and financial analysts with a detailed understanding of the calculation methodology, strategic considerations, and operational implications of participating in this advanced alternative payment model.
Understanding the ACO-27 Model Framework
The ACO-27 model, introduced in the 2023 Medicare Physician Fee Schedule Final Rule, builds upon previous MSSP iterations with several key enhancements:
- Risk Adjustment Refinements: Incorporates more sophisticated risk scoring methodologies to account for social determinants of health
- Benchmarking Improvements: Uses regional spending patterns with a 3-year historical benchmark blended with regional FFS expenditures
- Quality Measurement: Transition to the Merit-based Incentive Payment System (MIPS) Clinical Quality Measures (CQMs) with digital quality measurement requirements
- Health Equity Adjustments: Introduces health equity bonus payments for ACOs serving dual-eligible and underserved populations
Core Calculation Components
The MSSP financial calculation under ACO-27 involves several interconnected components that determine an ACO’s shared savings or losses:
- Benchmark Establishment: The historical benchmark is calculated using:
- 3 years of historical spending data for assigned beneficiaries
- Regional FFS spending adjustments (weighted at 35% in PY1, increasing to 70% by PY3)
- Risk score growth cap of 3% annually
- Quality bonus adjustments (up to 10% for high-performing ACOs)
- Current Year Spending: The actual Medicare Part A and B spending for assigned beneficiaries during the performance year, adjusted for:
- Risk scores (with symmetric adjustment for increases/decreases)
- Geographic price adjustments
- Catastrophic cost exclusions
- Savings/Loss Determination: The difference between benchmark spending and current year spending determines gross savings or losses
- Quality Performance Adjustment: ACOs must meet the quality performance standard (30th percentile of MIPS quality score) to be eligible for shared savings
- Shared Savings/Losses Calculation: Applied based on the ACO’s selected track and performance
Track-Specific Financial Parameters
| Parameter | Basic Track (Level E) | Enhanced Track |
|---|---|---|
| Maximum Sharing Rate | 50% | 75% |
| Minimum Savings Rate | 2% | 2% |
| Minimum Loss Rate | 0% (one-sided risk) | 0.5% |
| Risk Corridor | 0-2% (no risk) | 0-60% (phased in) |
| Quality Withhold | 25% of shared savings | 25% of shared savings |
| Health Equity Bonus | Up to 10% | Up to 10% |
The Enhanced Track offers higher potential rewards but requires ACOs to accept two-sided risk. The Basic Track (Level E) provides a more gradual transition to risk-bearing arrangements while still offering meaningful shared savings opportunities.
Quality Measurement and Performance
Under ACO-27, quality performance represents 30% of the total score (down from 40% in previous models), with the remaining 70% based on financial performance. The quality measurement framework includes:
- MIPS CQMs (40%): 6 measures including:
- Controlling High Blood Pressure
- Diabetes Hemoglobin A1c Poor Control
- Colorectal Cancer Screening
- Breast Cancer Screening
- Falls Screening for Future Fall Risk
- Depression Screening and Follow-Up Plan
- CAHPS Survey (30%): Patient experience measures
- Promoting Interoperability (25%): Digital health information exchange
- Improvement Activities (5%): Focus on health equity and social determinants
ACOs must achieve at least the 30th percentile on quality performance to be eligible for shared savings. The quality score also determines the quality bonus adjustment to the benchmark (up to +1.5% for exceptional performance).
Health Equity Adjustments and Bonuses
The ACO-27 model introduces significant health equity components:
- Health Equity Adjustment: Up to 10 bonus points on the quality score for ACOs that:
- Serve ≥50% dual-eligible beneficiaries
- Or serve ≥50% beneficiaries in areas with high Area Deprivation Index scores
- Health Equity Bonus Payment: Additional shared savings (up to 10%) for ACOs that demonstrate:
- Reductions in health disparities for clinical quality measures
- Improvements in screening for social needs
- Increased use of community health workers
- Beneficiary Incentive Program: ACOs can offer $20 incentive payments to beneficiaries for completing health risk assessments
| Metric | Standard ACO | Health Equity Focused ACO | Difference |
|---|---|---|---|
| Quality Score | 88% | 98% (with 10-point bonus) | +10% |
| Benchmark Adjustment | +0.5% | +1.5% | +1.0% |
| Shared Savings Rate | 45% | 50% (with health equity bonus) | +5% |
| Estimated Additional Payment | $0 | $250,000 | $250,000 |
Strategic Considerations for ACOs
Successful participation in the MSSP under ACO-27 requires careful strategic planning:
- Population Health Management:
- Implement advanced analytics for risk stratification
- Develop care management programs for high-risk beneficiaries
- Integrate social determinants of health data into care plans
- Financial Risk Management:
- Conduct scenario analysis for track selection
- Develop stop-loss arrangements for downside risk
- Implement utilization management programs
- Quality Improvement Initiatives:
- Focus on high-impact MIPS measures
- Implement patient engagement strategies for CAHPS
- Invest in health IT interoperability
- Health Equity Strategies:
- Partner with community-based organizations
- Implement culturally competent care programs
- Develop transportation and food insecurity interventions
Operational Implementation Challenges
ACOs face several operational challenges in implementing the ACO-27 model:
- Data Integration: Combining claims data with clinical and SDOH data requires robust health IT infrastructure
- Attribution Management: The voluntary alignment process adds complexity to beneficiary assignment
- Risk Adjustment Accuracy: Ensuring complete and accurate HCC coding is critical for fair benchmarking
- Provider Engagement: Aligning incentives across diverse provider types remains challenging
- Regulatory Compliance: The model introduces new reporting requirements for health equity metrics
Financial Modeling and Projection
Sophisticated financial modeling is essential for ACOs to project potential savings and make informed participation decisions. Key modeling components include:
- Benchmark Projection:
- Historical spending trends analysis
- Regional spending pattern modeling
- Risk score growth projections
- Spending Reduction Opportunities:
- Post-acute care utilization management
- Chronic disease management programs
- Preventable admission reduction
- Shared Savings Estimation:
- Scenario analysis by quality performance tiers
- Track comparison modeling
- Health equity bonus projections
- Cash Flow Analysis:
- Timing of shared savings payments
- Upfront investment requirements
- Return on investment calculations
Emerging Trends in ACO Performance
Recent data from CMS and independent analyses reveal several important trends in ACO performance under value-based payment models:
- Growing Participation: The number of MSSP ACOs increased by 8% in 2023, with particular growth in rural and physician-led ACOs
- Improving Quality: The average ACO quality score reached 94.6% in 2022, up from 92.3% in 2021
- Savings Generation: MSSP ACOs generated $1.8 billion in gross savings in 2022, with $1.2 billion returned to ACOs as shared savings
- Health Equity Focus: ACOs serving high proportions of dual-eligible beneficiaries achieved 12% higher quality scores on average
- Technology Adoption: 87% of high-performing ACOs now use advanced analytics platforms for population health management
These trends suggest that the ACO model continues to evolve as a viable path to value-based care, with the ACO-27 modifications addressing many of the challenges identified in earlier iterations.
Case Study: High-Performing ACO Under ACO-27
A 150-physician multispecialty group in the Midwest provides an illustrative example of success under the ACO-27 model:
- Background: 22,000 attributed beneficiaries, 65% in rural counties, 32% dual-eligible
- Strategies Implemented:
- Established a centralized care coordination hub with 24/7 nurse triage
- Implemented predictive analytics for high-risk patients
- Developed partnerships with 12 community-based organizations
- Launched a transportation benefit for non-emergency medical visits
- Results:
- Achieved 98% quality score (with 10-point health equity bonus)
- Reduced benchmark spending by 4.2% ($9.2 million gross savings)
- Earned $5.1 million in shared savings (55% sharing rate with bonuses)
- Reduced hospital admissions by 18% and ER visits by 22%
- Lessons Learned:
- Early investment in health IT infrastructure was critical
- Physician engagement required continuous education and transparent data sharing
- Community partnerships were essential for addressing social determinants
Future Directions for MSSP
Looking ahead, CMS has signaled several potential evolutions for the MSSP program:
- Increased Risk Taking: Gradual transition of all ACOs to two-sided risk models
- Expanded Health Equity Measures: Additional bonus opportunities for ACOs serving vulnerable populations
- Digital Quality Measurement: Full transition to electronic clinical quality measures (eCQMs)
- Beneficiary Engagement Tools: Enhanced beneficiary incentives and engagement platforms
- Specialty ACO Models: Potential new tracks for specialty-focused ACOs (e.g., oncology, cardiology)
ACOs that proactively prepare for these changes by investing in care coordination infrastructure, health equity initiatives, and advanced analytics will be best positioned for success in the evolving value-based care landscape.
Common Pitfalls and Mitigation Strategies
Based on the experience of early adopters, several common challenges have emerged with corresponding mitigation strategies:
| Pitfall | Impact | Mitigation Strategy |
|---|---|---|
| Incomplete Risk Adjustment | Underestimated benchmark leading to false savings | Implement HCC coding audits and physician education programs |
| Overestimation of Savings | Financial losses when actual spending exceeds projections | Use conservative assumptions in financial modeling with sensitivity analysis |
| Quality Measure Neglect | Ineligibility for shared savings despite financial performance | Dedicate resources to quality reporting and performance improvement |
| Provider Disengagement | Lack of care coordination leading to poor outcomes | Develop physician compensation models aligned with ACO goals |
| Health Equity Blind Spots | Missed bonus opportunities and disparities in care | Implement SDOH screening and targeted interventions for vulnerable populations |
Conclusion: Strategic Approach to MSSP Success
The MSSP under the ACO-27 model represents both a significant opportunity and challenge for healthcare organizations transitioning to value-based care. Success requires:
- Data-Driven Decision Making: Robust analytics capabilities to identify savings opportunities and monitor performance
- Clinical Transformation: Redesign of care delivery models to focus on prevention and chronic disease management
- Financial Sophistication: Advanced financial modeling to project outcomes under different scenarios
- Health Equity Focus: Proactive strategies to address disparities and qualify for bonus payments
- Continuous Improvement: Ongoing performance monitoring and rapid-cycle quality improvement
Organizations that approach MSSP participation as a catalyst for broader healthcare transformation—rather than merely a payment model—will achieve the most sustainable success. The ACO-27 model’s emphasis on health equity and quality improvement aligns with the broader industry shift toward patient-centered, value-based care.
As the healthcare landscape continues to evolve, ACOs that can effectively balance financial accountability with high-quality, equitable care will not only succeed in the MSSP program but will also position themselves as leaders in the value-based care movement.