The Long-term Enhanced ACO Design (LEAD) Model signals a structural shift in accountable care. CMS is no longer treating specialty care as peripheral to population-based models. Under LEAD, specialty integration, episode accountability, and complex care management are embedded directly into the ACO model.
Through CMS-Administered Risk Arrangements (CARA) and shadow bundles, CMS is lowering the operational barriers to bringing specialists into meaningful value-based arrangements. For ACO leaders, the message is clear: specialty-driven performance will increasingly determine success under population-based payment models.
A Structural Change: High-Needs Beneficiaries Inside the Core Model
Specialty utilization and outcomes are disproportionately concentrated among complex patient populations. Earlier Innovation Center models often carved out high-needs beneficiaries into dedicated tracks, but LEAD embeds high-needs and complex beneficiaries across the ACO’s full panel. By integrating these beneficiaries into the core population, CMS is reinforcing that:
- Specialty care performance is central to total cost of care.
- Episode-level variation must be managed within the ACO construct.
- Primary care alone cannot drive sustainable performance improvement.
This integration is broadening the dynamics that ACOs must understand to be successful.
Shadow Bundles: Episode Accountability Within Population-Based MODELS
Shadow bundles run alongside the ACO’s total cost-of-care benchmark without replacing it. In the Medicare Shared Savings Program (MSSP) and the ACO REACH model, shadow bundles data provide episode-level transparency into specialty-driven spending, standardized definitions of clinical episodes.
This is an evolution from prior bundled payment models such as the Bundled Payments for Care Improvement (BPCI), BPCI-Advanced, and Comprehensive Care for Joint Replacement (CJR). Those models operated independently of ACO attribution, while LEAD integrates episode constructs directly into a population-based framework.
LEAD takes this one step further with CARA. Rather than layering separate models on top of one another, CARA creates a unified structure in which episode performance and population-based accountability reinforce one another.
CARA: Standardized Episode Infrastructure With Local Flexibility
CARA is the operational backbone of specialty integration under LEAD.
Rather than requiring ACOs to design and reconcile complex episode-based risk contracts using shadow bundles data, CARA allows CMS to administer episode-based risk arrangements on behalf of ACOs. This creates standardized, scalable ways to test specialty-focused risk while reducing administrative friction for ACOs and their provider partners.
At the same time, CARA preserves flexibility. ACOs can use CMS-defined episode parameters as a foundation while structuring customized gainsharing or downside risk arrangements with specialists, hospitals, and post-acute providers. Through this flexibility, CMS is explicitly aiming to make it easier to bring specialists into accountable care arrangements.
Alignment With TEAM and the Broader Model Portfolio
The Transforming Episode Accountability Model (TEAM) extends mandatory episode accountability for certain hospital-based surgical episodes. LEAD and CARA represent the ACO-based complement to TEAM.
In many markets, ACOs will face overlapping participation dynamics between hospitals participating in TEAM; ACOs operating under MSSP or LEAD; and specialists and post-acute providers engaging across multiple models. The executive challenge here is alignment: incentives across TEAM, LEAD, and existing ACO strategies must be coordinated to avoid fragmentation and conflicting financial signals.
CARA provides a mechanism for creating that alignment within the ACO structure, particularly for episodes not currently included in TEAM, such as high-volume medical conditions.
A Clear Direction From CMS
Taken together, LEAD, CARA, and shadow bundles communicate three durable signals:
- Specialty care is central to ACO cost and quality performance.
- Episode-level variation must be addressed within population-based models.
- Operational barriers to specialty engagement must be reduced to scale value-based care.
For ACO leaders, the strategic question is no longer whether to integrate specialty care into risk-based arrangements; it is how quickly and deliberately that integration can occur. LEAD formalizes what market forces and prior models have been building toward: accountable care that meaningfully incorporates specialty and post-acute care accountability within the ACO chassis.
Note: In the context of BPCI-A and shadow bundles, a “medical episode” refers to a specific set of services provided to a patient during a defined period, typically associated with a medical condition or procedure. Conversely, a “surgical episode” involves a surgical procedure and all related care services provided to a patient, often within a specific timeframe following the procedure. These definitions are part of the broader framework of episode-based payment models used by CMS.