Does insurance approval still apply if I change providers before my surgery date? (Photo)

My breast reduction surgery is approved, but my insurance is scheduled for January 2016. The problem is that my company is changing to a different insurance provider starting January 5. Do I hurriedly find another reputed plastic surgeon to perform the surgery this year or would the approval still apply should I change companies in January? I met my deductible for this year - 2015.

