The cedula has to be displayed in the doctors office where you can easily read the number together with his/her diplomas, the doctors office also has to have at least 3 different permits, one is the permit for the clinic or office, one for the federal income and one for the states income all displayed either in the doctors office or the receptionists office, if you get an expat that is practicing in Mexico and they do not have these documents, beware they are illegal or scammers and they do not have to be Canadian or from the USA, they come in all shades and flavors.
Other things you need to be aware are the famous "temascal" or sweat lodges, they are heat and steam baths they are regulated by the state and have specific construction requirements, if you go to one and it is covered with plastic or a tarp, that is illegal, too many persons have either died or suffered severe poisoning from the chemicals released by the tarps being used as cover in the construction of the temporary temascal, they need to be all brick and mortar or better made with adobe bricks with the heating fire on the out side and sufficient air circulation so as not to be poisoned by the smoke or carbon monoxide, they have to be permanent and not a make shift tent.
In large hospitals all the personnel that attend to patients have to be certified, a good friend of ours is a registered nurse and the daughter of another friend just got her cedula de certificacion to practice, my brother in law is an architect and also has cedula and all the other goodies that go with the office, me I am retired and:
Viviendo la vida loca!
navegator