in general all hikers, speleologists, trekker and rock-climbers should get medical insurance before undertaking any journey or activity - in fact, even basic medical treatment at rio's hospitals can quickly add up to thousands of dollars. 

furthermore, most hospitals will not provide any treatment past the initial emergency assistance without proper coverage or upfront payment.

companies such as medex, allianz, and travel guard are good starting point to start researching the best plans.

important - mountain climbing, hiking, or any other outdoor activity is subject to risks of serious accidents, including death - people who do not possess proper hiking or climbing techniques, experience, and/or are not in excellent physical shape must hire or consult an expert trainer or guide for safety.