The combined net worth of the five richest physician billionaires is $45.1 billion, according to Forbes' net worth tracker.
Here are the five richest physician billionaires (Note: Net worth is accurate as of Oct. 9):
Net worth: $30.7 billion
Dr. Frist co-founded HCA Healthcare alongside his father in 1968 and currently holds more than 20% ownership in the company. Although he no longer serves in an executive capacity, both of his sons now sit on the board of directors.
Net worth: $6 billion
Dr. Soon-Shiong developed pancreatic cancer drug Abraxane and later sold his companies -- Abraxis in 2010 and American Pharmaceutical in 2008, for a total of $9.1 billion. In 2015, he took his cancer drug company NantKwest public, followed by his biotech startup NantHealth in 2016.
Net worth: $3.5 billion
Dr. Schleifer is the co-founder and CEO of Regeneron Pharmaceuticals, a biotechnology company he helped establish in 1988. He took the company public in 1991 and currently holds nearly 4% of its common stock. Regeneron, recognized for developing six FDA-approved drugs, is best known for Eylea, a treatment for macular degeneration.
Net worth: $2.7 billion
Dr. Troendle is the president, CEO and founder of clinical research company Medpace and owns about 24% of the stock. Before founding Medpace, Dr. Troendle spent five years as a director at Swiss pharma company Sandoz, now known as Novartis.
Net worth: $2.2 billion
Dr. Yancopoulos is the co-founder, president and chief scientific officer of Regeneron Pharmaceuticals. He owns about 1% of the stock. Regeneron was cofounded by Dr. Schleifer in 1988, and Dr. Yancopoulos joined the next year.