The Biden administration on Tuesday unveiled a new rule aimed at reining in privatized Medicare Advantage plans, which have drawn growing federal scrutiny for denying coverage claims en masse—sometimes using artificial intelligence—and overbilling the government to the tune of tens of billions of dollars per year.

Mehmet Oz, a celebrity heart surgeon turned talk show host and lifestyle guru, is President-elect Donald Trump’s pick to run the Centers for Medicare and Medicaid Services, the massive federal health care bureaucracy that covers more than a third of Americans.

Dr. Mehmet Oz, Donald Trump's pick to oversee Medicare and Medicaid, has evolved on health care policy over the years.

Oz has made his preference known for privatized Medicare, which could substantially disrupt the current system.

President-elect Donald Trump has picked Dr. Mehmet Oz to serve as the administrator for the Centers for Medicare and Medicaid Services, a key federal agency that oversees health insurance coverage for more than 150 million Americans.

Dr. Oz holds a plethora of investments in healthcare, pharmaceutical, health insurance and health research companies