
Accountable care organization (ACO) participation was associated with an increase in hospitals’ mean market share and with additional market share gains in more concentrated markets.

Accountable care organization (ACO) participation was associated with an increase in hospitals’ mean market share and with additional market share gains in more concentrated markets.

A higher percentage of accountable care organization (ACO) primary care providers was associated with physician leadership, upside financial risk, and financial compensation of physicians tied to performance measures.