Lyndsay's answer is a very helpful one. I endorse it. Hourly rates for medical malpractice defense attorneys tends to be somewhat depressed by the market power of medical malpractice insurance companies to negotiate lower hourly rates. This results in lower salaries for medical malpractice defense attorneys. Medical malpractice plaintiffs' attorneys income depends on their ability to leverage large settlements from the medical malpractice insurance companies. So, some do very well. Others barely get by.
In other more complex areas of law relating to the practice of medicine, such as defending against government claims related to alleged fraud or misbilling for medical services paid for by the federal government, good experienced attorneys can expect to be well-compensated.