Medicaid plans often outsource the work of managing patients’ health and medical treatment to subcontractors, and these companies routinely deny or skimp on services.
Credit: ASISEEIT / GETTY

Marcela Villa isn’t a big name in health care — but she played a crucial role in the lives of thousands of Medicaid patients in California. Her official title: denial nurse.

Each week, dozens of requests for treatment landed on her desk after preliminary rejections. Her job, with the assistance of a part-time medical director, was to conclusively determine whether the care — from doctor visits to cancer treatment — should be covered under the nation’s health insurance program for low-income Americans.

She was drowning in requests, she said, and felt pressed to uphold most of the denials she saw. “If it was a high-dollar case, they tried to deny it,” Villa said. “I told them you can’t deny it just because it’s going to cost $20,000.”

Villa, 32, did not work for the government. She did not even work for an insurer under contract with […]