Will FMLA allow sick time to be used if an abdominoplasty is used to repair an umbilical hernia? Policy says no cosmetic surgery

I have been told that I need to have surgery to repair my umbilical hernia due to pain that I've had. I also have diastasis and loose skin from three pregnancies, where the last was quite large. One option is to go to a GS and have a mesh applied to fix the hernia. The other is to see a PS and have an abdomnioplasty. It seems silly to have a mesh applied instead of a tummy tuck, when the tummy tuck would also repair my diastasis. My father also had pain where mesh was used to repair a hernia