So you should consult the local health bureau.
As for your mention that you have passed the examination as a medical practitioner, it doesn't mean anything. You just said that you took the exam. The key is whether you have obtained a medical license in the exam.
Because the establishment (I mean the formal and legal establishment) of a medical and health institution requires the founder or the personnel in the institution to have the qualification of a medical practitioner's certificate before the Health Bureau can conduct an audit, which is a prerequisite for approval.