20+ years medical biller here.
It's a clerical error. You are in their system for the work you legitimately had done. Your name and/or account number is probably close to the person who actually had those services, and the charges were applied to your account by mistake.
Call the providers office directly. If they do use a third party biller (like me) it's their responsibility to bring it to the biller's attention and make sure the issue gets corrected. It's also their responsibility to reverse any claim that might have been filed incorrectly to your insurance. BUT, I would still contact your insurance yourself and let them know that you did not receive services on that date, and they should not pay for any claim stating you did.
Deal with this now, don't wait. Call now and then follow up in about a week to make sure the issue was fixed. I know it's a pain but you don't want this defaulting into collections because no one took care of it. Honest mistakes happen, of course, but you don't want to risk your credit rating on someone else's ability to follow through.
Sorry you're having to deal with this. I know it's frustrating. Me: Enjoying life
Him: Someone else's problem
Follow your heart, but take your brain with you. ~ Alfred Adler