No, this is expressly prohibited by the current Regulation on the awarding of academic degrees: "Persons with a higher medical education, confirmed by a specialist or master's diploma, are allowed to defend dissertations for the degree of Doctor of Science, Candidate of Science in Medical Sciences" (rg.ru) Similar conditions also apply to veterinarians and lawyers.
At the same time, no one bothers you to defend your thesis in economic sciences in the field of health management.
You can't. Earlier in medical schools they read the health organization (OZO). Now I do not know. Administrative physicians could defend a dissertation on health care management. This is how the menager appeared in medicine. As a rule, bad doctors became menager. Now everyone wants to become chief doctors, because of the unfairly high salaries. For example, the head physician receives 10% of all money received by the cashier of the institution for the provision of paid services.