Probably not.  In general, your Medicare Part D prescription drug coverage (like Medicare Part A and Medicare Part B coverage) is only available within the United States or U.S. territories - except in very limited circumstances.
(see: https://www.medicare.gov/coverage/travel-outside-the-u.s.)

Question:  So how do I get my medications covered as I travel outside of the United States?

(3)  Purchase additional international travel insurance that covers prescriptions.

Consider obtaining an international travel insurance policy as an alternative to your Medicare Part D coverage.  International travel insurance may be offered by AAA, AARP, or specialty insurance companies such as International Medical Group (IMG).  As with any insurance policy, before enrolling, please read the international travel insurance policy's coverage details closely to understand what healthcare is covered - and what is coverage is excluded (such as pre-existing healthcare conditions).

(4)  Purchase your prescriptions as you travel abroad.

The United States government recommends that people traveling with health concerns or prescription needs carry a letter from their prescribing doctor describing their healthcare and prescription needs (including generic drug names).  Travels with healthcare concerns are encouraged to keep such information with them at all times.  In addition, the government warns travelers to "[c]heck with the foreign embassy of the country you are visiting or transiting to make sure your medications are permitted in that country."

Question:  Even if I cannot use my Medicare Part D plan as I am traveling abroad, will my Medicare Part D plan at least reimburse me if I purchase a formulary medication outside the US?

Probably not.  You can click here to read more in our FAQ "If I travel outside of the United States, purchase prescription drugs while outside of the country and bring them back on my return trip, will my Medicare Part D plan reimburse me for these medications if they are on my plan's formulary?"

September 2020 note:  Medicare may be currently working on rules to allow some drug importation.  For more information, please contact a Medicare representative at 1-800-MEDICARE.

Final Note: Medicare Supplements and international Medicare Part A and Part B coverage

Some Medicare Supplements (or MediGap policies) may provide healthcare coverage outside the United States. You will need to check with a local insurance agent to learn more about the Medicare Supplements available in your state.