Hello Geo M, we reviewed our records and, with you present, we contacted your insurance company on a previous occasion where they quoted us an original % coverage on needed services. Well before your appointment, they then quoted us another, lower, coverage rate. While a change in coverage is an odd situation, we have no control over the policies of insurance companies and can only relay what they tell us. In this case, you were informed of the amount they would cover and what your portion would be well before the date of services. This may be an issue you want to bring up with your HR department at your office.