CMS creates 26 PPO regions.
Benko
Laura B
LB
D000368:Aged; D014487:Centers for Medicare and Medicaid Services, U.S.; D006801:Humans; D007356:Insurance, Pharmaceutical Services; D006278:Medicare / Q000458:organization & administration*; D011243:Preferred Provider Organizations / Q000458:organization & administration*; D012040:Regional Health Planning; D014481:United States