Do I have 2 follow immoral/potentially dangerous treatment?

My health ins. denied benefits for a hysteroscopy preformed during a laporoscopy looking for endometriosis which I was found to have severly. The denied it based on the fact that I had not tried treatment with oral contraceptives for 3 months before the procedure. I refuse to take birth control due to the world health organization deeming it highly carcinogenic and for religious reasons. (Im Catholic) They cant force me to follow an immoral and potentially dangerous course of treatment in order for them to approve a claim can they?