I've gotten burned a couple of times by my medical provider. Not on procedures though. The worst case was when a physical therapist "through in" a pair of gel insoles. My insurance wouldn't pay for them so I got the bill. The cost was $50 or $75. I could have gotten the same thing at Walgreens for $10.
Another cause of irritation concerns my prescriptions. I'll call in the order to my pharmacy and invariably the pharmacy calls back to say the prescription needs Dr. authorization. Then I wait a few days and call the pharmacy to see what the delay is and the pharmacy says the authorization hasn't been given so I then call the Dr's office to see what the delay is and usually a couple of days later the authorization comes through. Last week it happened again. When I called the Dr's office I told them that if they could not provide me better service I would have to fire them and take by business elsewhere. A half hour later the pharmacy called to say my scripts were ready for pickup. And its not like my drugs are OxyContin or morphine. Just thyroid and diabetes drugs.