It doesn't sound like a medical evac, just ending the trip early. My MasterCards through Barclays have this benefit which sounds like what Southshore described.

Enhanced Trip Cancellation/Trip Interruption
The cardholder, their family members and traveling companions are eligible for reimbursement for the nonrefundable payments to a Travel Supplier, or the costs to return home early, or to rejoin a trip if a covered trip is cancelled or interrupted due to a sudden illness, injury or death to the cardholder, their spouse, a travel companion or an eligible dependent, inclement weather, change in military orders, terrorist action, jury duty, an uninhabitable home or quarantine imposed by a physician.