@MatthewO,
Sorry to tell you this, but there isn't a damn thing you can do about it. My ex-wife got a Gastric Sleeve done while we were separated because she was still on my insurance. I had it put into the divorce agreement that I wasn't paying for the medical bills associated with the procedure and considered it a parting gift. Now I only hope she uses it to get herself a new husband so I don't have to pay the ridiculous amount of alimony I have to pay for 9 years.
Just hope she doesn't get you for $1300 a month like mine did. I would rather see her dating then pigging out on my money...