Can a hairline that was set too low from a previous hair transplant be raised higher through another hair transplant?

Hello, it is highly unlikely that any insurance company will pay for a hair transplant as it is considered a cosmetic procedure. You an call your insurance company and ask.

Hello. I understand your concern given the things you are seeing. I think its best you see your surgeon, you could have an infection and if so it needs to be treated. Good luck.

Diffuse thinning does not provide a good quality donor region to harvest from. It also does not provide high quality grafts to transplant so often diffuse thinners are not candidates for hair transplant surgery.