The kind of work you are planning to do often determines the type of health coverage you should get. To sort through the maze of available policies, you should first determine your needs. How long will you be volunteering and what will be your primary activities? There are many specialized policies available and also policies that include the injuries caused by the direct contact with wild animals. If you are planning to go hiking, mountaineering, or you will spend a lot of time in the jungle it might be a good idea to get comprehensive health coverage that includes Air Ambulance and Emergency Medical Evacuation.
If you are planning a trip to a tropical country where many infectious diseases might be present, you might want to consider a type of coverage that includes doctor’s visits and medication in addition to medical emergencies. While if you are travelling to a country with few health threats, you might want to consider a policy that only covers medical emergencies such as hospitalization. I have travelled in tropical countries, and had to see a doctor for minor health problems.
Sometimes your insurance does not cover doctor’s visit, you can go to a clinic that is part of the public health system, where treatment is usually very affordable. But if you prefer seeing a private doctor or a specialist while travelling, the cost for treatment might go up significantly, and it might therefore be better for you to choose a policy that includes doctor’s visits as well.