Re: Health Care for CA's in BrazilI have not lived in Brazil, so do not know the specific answer to your first questions. In the countries where I have lived with universal health insurance getting health care was a mixed bag - in some no problem, in others there were fees for foreigners. Whether as a diplomat you would be considered "resident" is a question. You, after all, are not paying any Brazilian taxes.
As to the need for your own health insurance plan, yes you do need to have your own stateside policy. You need this to cover any health expenditures in the States or on leave in another country. Regardless of how good Brazilian health care may be, you may find yourself being evacuated to the States for medical care and you will definitely need health insurance for this.