Collections and credit score hit

I have an ambulance bill that I’ve been fighting for about a year now. My question is simply ‘how much’ does it affect my credit score if it goes to collections? I have excellent credit, over 800. Since I own my house, car and already have established credit cards, do I really care?! If it’s just a 50-100 point hit, maybe not. I'm just considering my options at this point. I’m retired and living in SC if it matters. TIA