The health plan market has become increasingly complicated. Of the estimated 33 million people in Medicare Advantage plans, 50% were enrolled in either a UnitedHealthcare or Humana plan (see Most Medicare Advantage Markets Are Dominated By One Or Two Insurers). For Medicaid managed care, plans owned by Centene have an estimated 20% of market share (see A Look At Medicaid Enrollment And Finances Of The Five Largest Medicaid Managed Care Plans).

Like much of health care, the health plan market landscape is seeing some fundamental shifts. Health plans are trying to assess the likely impact of nine months of executive orders, and the Congressional budget bill (see …