UnitedHealth Group struck a deal in March to buy the nine-state doctor group of the struggling hospital system Steward Health Care. AdvertisementDoctors are hot commoditiesIt's tough to lump the many buyers of medical practices together, as they're pursuing different strategies. Insurers like UnitedHealthcare and CVS' Aetna are required by federal law to spend most of the money they collect in premiums on medical care. Plus, running a modern medical practice is expensive, requiring investments in staffing, technology, and electronic health records. Advertisement"The corporate practice of medicine is the reason why healthcare costs are out of control," Li said.

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