Each healthcare organisation hosts their own MyChart servers and therefore decides which IP addresses in the world can access their databases, websites, and app content. It is up to the healthcare organisation to decide how much security they want to have and which countries to allow.
If you are having trouble accessing MyChart while travelling internationally, contact your healthcare organisation directly to ask about using MyChart in your current country. You can usually find their contact information on the FAQ page, which is linked at the bottom of their MyChart website.
MyChart is only available at organisations that use Epic software. View the full list of MyChart organisations by selecting Find your MyChart. If your organisation is not listed, contact them directly.
Enter your username and password on your healthcare organisation's MyChart website or the MyChart mobile app to log in.