Can I get admitted to Master in mathematics program if I only have a medical degree? I will complete my medical school (in Indonesia) very shortly.
I'm planning to pursue a master degree in mathematics at a university in the USA or UK.  I do not have a mathematics bachelor's degree. During my years as a med school student I studied math independently from textbooks and sites such as Coursera and MIT OCW.

Can a student with only a medical degree get admitted to a graduate program in Mathematics?
The question is whether you have enough background to be likely to pass the first-semester courses in such a program.  For instance, if you have never studied real analysis, complex analysis or differential equations at the level of a senior undergraduate course, you may find yourself completely lost in graduate courses.  I think it will be very difficult to convince an admissions committee that you would survive the first semester.