Welcome to Just Answer and thanks for your question. Dr. Ron Sherman at the University of California - Irvine is an expert in the use of biologicals for wound healing, including the use of leeches and medical maggots (usually a better choice for debridement than leeches).
UC Irvine gets their medical maggots from Monarch Labs. They also maintain a list of practitioners, but they do not publicize it. You can contact them via email for a referral in your area.