The Medical Information Bureau.
While many decry the use of a clearing house for your medical information, this is really a necessary evil.
If you are applying for insurance, life or health or disability or whatever, your Social Security Number will be run by the MIB. They will tell the insurance company if you have any "codes" which need further investigation. They don't tell the company what the codes are actually for; they just inform the company that you might have some health problems.
What folks who get pissed off about this fail to realize is that healthy people should pay less for insurance than those who are more likely to become ill or die early. That's the free market at work in the world of insurance.
You could try the system in Canada or Germany if you want to try true socialized medicine. I don't think you'll care for it, though.