Diploma Recognition for Health Professionals and Doctors in Japan

Hi, everyone. I would like to know how I can validate my diploma in Japan. I have a degree in medicine and MBA in Healthcare Management and I currently work with health policies/health benefits for employees in an international company.  I don't provide medical assistance anymore and I work just in the office with administrative activities.
In this case, I would like to know what are the options to validate my diploma and be able to work in Japan, according to local legal requirements. Is it necessary to take N1 Japanese Language Proficiency Test even if the company accept doing the activities in English?

Thank you in advance.

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