Sick profit: Investigating private equity's stealthy takeover of health care

Two-year-old Zion Gastelum died just days after dentists performed root canals and put crowns on six baby teeth at a clinic affiliated with a private equity firm.

His parents sued the Kool Smiles dental clinic in Yuma, Arizona, and its private equity investor, FFL Partners. They argued the procedures were done needlessly, in keeping with a corporate strategy to maximize profits by overtreating kids from lower-income families enrolled in Medicaid. Zion died after being diagnosed with "brain damage caused by a lack of oxygen," according to the lawsuit.

Kool Smiles "overtreats, underperforms and overbills," the family alleged in the suit, which was settled last year under confidential terms. FFL Partners and Kool Smiles had no comment but denied liability in court filings.