Any journey involves risk. So too mission trips , especially those with third country destinations if you are from a first world country. It should not only cover hospitalization, or help in event of loss of passport or important documentation and credit card, it also should provide for medical transportation home by air in event it is required because of inavailability of medical treatment and care. Do not assume, do some research, take care with common sense, then go knowing that the Lord is in control.
Be happy and safe as you go in the will of the Lord.