President-elect Donald Trump has nominated Dr. Mehmet Oz to lead the Centers for Medicare and Medicaid Services (CMS), sparking conversations about potential changes to Medicare. This key agency oversees health programs for over 160 million Americans,

Oz, who Donald Trump earlier this month chose to lead the Centers for Medicare and Medicaid Services, has an estimated net worth of $200 million, according to Celebrity Net Worth. The Centers for Medicare and Medicaid Services is part of the Department of Health and Human Services, which Trump has tapped Robert F. Kennedy, Jr., to lead.

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.

The celebrity physician would run the Centers for Medicare and Medicaid Services, a powerful agency in charge of programs that cover more than 150 million Americans.

Trump said Tuesday he would nominate Oz as administrator of the Centers for Medicare & Medicaid Services. The agency’s scope is huge: CMS oversees coverage for more than 160 million Americans, nearly half the population.