I left my non-stick pan in the oven while it was preheating, can I still use it?
From the T-FAL site:


  • Oven safe to 500°F/260°C if handles are all stainless steel. Oven safe to 350°F/175°C if handles have any phenolic, plastic parts.
  Oven safe to 400°F/204°C if handles have any silicone parts. 


So the pan itself should be fine, but the handles can be damaged.  No need to toss it just because you're worried about the coating being changed.