Not great coverage because the providers in (for example) Cuba might not accept assignment of the Med Supp benefits. They may require you to pay and then you try to get reimbursed.
I stand by my recommendation to spend the $100 and get travel insurance. The plans will pay on behalf and have concierge service damn near worldwide.
If someone can afford to travel, they can afford to protect themselves with proper coverage.
Rick
Don't they have universal healthcare in Cuba?