Although accountable care organizations saved $422 million last year, two may leave the Pioneer ACO program soon because of financial woes, according to Healthcare Finance News. New Hampshire's Dartmouth-Hitchcock Medical Center and Maine's Beacon Health are seriously considering leaving the program, despite having among the highest quality scores of all the Pioneer ACOs. The two owe the Centers for Medicare & Medicaid Services a combined $7.9 million for not meeting financial benchmarks. Read the full story at FierceHealthcare