In general terms, HSA and FSA funds can be used for qualified medical expenses regardless of where the care is received, including outside the United States. What matters under IRS rules is whether the expense qualifies, not the country in which it was incurred.
That is the general principle. The details matter enormously,
Every year, hundreds of thousands of patients from the United States and Canada travel to Mexico for medical, dental, and surgical care.
For many of them, the destination is Cancun.
The reasons vary. Some are facing treatment costs they cannot manage at home. Others are waiting months for a specialist appointment.
Every year, hundreds of thousands of patients from the United States and Canada travel to Mexico for medical, dental, and surgical care.
For many of them, the destination is Cancun.
The reasons vary. Some are facing treatment costs they cannot manage at home. Others are waiting months for a specialist appointment.
USA & CAN: 
MX: