2023 CPT has 4 new Prolonged Codes. There are different codes and TIMES for Medicare versus for commercial carriers. Without this easy slide rule, it can be difficult to remember not only the needed code for each place of service - but also how many minutes for Medicare versus Commercial insurance claims.
One side of the Sliderule is used for Medicare and the opposite side is for Commercial insurance claims. One end is for new or initial visits and the other end is for established or subsequent visits.