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Accountable care represents an attempt to transform how health care is delivered and reimbursed. Its core premise is to assign responsibility for a population of patients to health care providers, with payments depending on the cost and quality outcomes for that population. These providers form accountable care organizations (ACOs) to collaborate with the intent to deliver high-quality, cost-effective care across the continuum of services for their covered populations (Tu 2015). For policymakers, the ACO model (being one permutation of what the authors refer to as “accountable care” more generally) represents a change in how health insurance payers pay for care. Payment reform is only the first half of the equation, however, because delivery reform drives benefits to patients by more effectively managing the care of the covered population. As the ACO model continues to proliferate (Muhlestein 2017) and increase its impact on patients, there is a growing need to better understand the delivery aspect of accountable care as it is broadly construed across Medicare, Medicaid, and commercial payers.