The number of Accountable Care Organizations (ACOs) in the U.S. is growing rapidly, causing major shift in the healthcare landscape. ACOs are provider lead organization with a strong primary care base. What makes them different from other healthcare models is that ACOs are collectively accountable for quality, costs and the full continuum of care for their patients. Encouraged by the Affordable Care Act, this type of shared-risk model, which also falls under value-based, is becoming a good option for many providers.