Is Practicing Medicine a "Right"?

Don Boudreaux has written a great article at Cafe Hayek titled "Who Licenses the Licensers?".  One important quote in the piece:

People are not generally stupid when spending their own money on themselves and their loved ones.

The right to offer medicine and healing services is literally a matter of life and death.  The state simply wants to promote that it is a privilege to practice medicine.

These propagandists are incorrect.  Doctors and nurses don't need to ask an agent of the state for permission to offer healthcare services to consenting adults.