In April 2024, I had a couple of procedures done, such as fillings, cleanings, root canals, and crowns. I was pregnant at the time, so I had to delay the crowning, but I had the imprints done beforehand. At my consultation appointment in April, my dentist reviewed the treatment plan and the costs. I knew that I would have to pay out of pocket for some of these procedures. When I went in for my first filling and root canal appointment, the office told me that my dental insurance didn't cover some of the costs. I knew this and was okay with whatever the updated pricing was. Paid $606 for the first appointment, and went on with my life. At the second appointment in May, I went in for the crown imprint, and at this appointment, I paid off the remainder of the treatment plan cost before I even got the services done (with the updated pricing that my EOB said wasn't covered). I paid $552 out of pocket. Several months later, in April of 2025, I kept on getting these calls with no sensible voice messages saying "this is a debt collector". No effort was made by my dentist over the year to let me know of this balance. I checked my dental insurance claims, and the claim was rejected for code D3910, which I knew was already rejected when I went in for my last appointment. Now I am confused why my dentist is saying that the insurance rejected it when I already paid off my balance. What should I do, and am I liable for the debt? Should I speak to the debt collector or the dental office? This was in California, and the insurance is with United Concordia. Not sure if this matters.