So, the average gastroenterologist earns between $300,000 and $500,000 per year.  This guy is a superstar and presumably earns well in excess of $500,000.  He sees between 4,000 and 5,000 patients per year, and pays $45k in medical malpractice premiums.

He said MGG grosses between $8 million and $10 million a year. He won't tell me what he earns, but he points out that the "average GE" in this area makes between $300,000 to $500,000 a year. He fields 4,000 to 5,000 patient visits a year and performs between 1,000 and 1,300 procedures.

….

Payroll and overhead eat up 60 percent of MGG's revenues, including the 6 percent spent just to collect money from insurance companies, Medicare and individuals. Hardi pays $45,000 a year for his own medical malpractice insurance.

Source: Thomas Heath - Value Added: Up close and personal with a gastroenterologist - washingtonpost.com