Nurse Jackie is a showcase for Edie Falco. She's incredible on the Showtime series.

Yup, that's Denzel Washington as part of the St. Elsewhere cast. It set the stage for future medical shows.

Barney who?!? Neil Patrick Harris shot to fame as Doogie Howser, M.D..

Thanks to Grey's Anatomy, the bar was set very high Private Practice. Addison and company never cleared it, but six seasons is nothing to sniff at.

Chicago Hope was a strong drama that only made one major mistake: it came out at the same time as ER.

More of a character study of one man than a look at life in a hospital, House challenged viewers each week with crazy medical cases.

General Hospital has been on for 45 years. Good luck topping that!

At time heartfelt, at times bonkers and always hilarious, let's just pretend Scrubs Season 9 never happened.

Grey's Anatomy is still going strong and there's no end in sight. For the most part, cast turnover has gone smoothly.

The standard by which all medical shows are judged. ER left an indelible impression on all viewers.

M*A*S*H will forever be remembered as a ground-breaking series that combined humor and emotion unlike any in TV history.