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…Most private and federal health insurance programs require patients to secure preapprovals for certain treatments, tests, or prescription medications. The process is intended to reduce spending and avoid unnecessary, ineffective, or duplicative care, although the degree to which companies and agencies set these rules varies.

Insurers argue prior authorization makes the U.S. health care system more efficient by cutting waste — theoretically a win for patients who may be harmed by excessive or futile treatment. But critics say prior authorization has become a tool that insurers use to restrict or delay expensive care. It’s an especially alarming issue for people diagnosed with cancer, for whom prompt treatment can mean the difference between life and death.

“I’m interested in value and affordability,” said Fumiko Chino, a member of the Affordability Working Group for the Memorial Sloan Kettering Cancer Center. But the way prior authorization is used now allows insurers to implement “denial by delay,” she said.