Correct billing for 48 hr holter monitior

We were billing for a 48 hr holter monitor by using 93224 with 2 units but it rejects. what is the correct way?

re: Correct billing for 48 hr holter monitior

CPT® code 93224 is up to 48 hrs by continous recording so you would only bill it once.

re: Correct billing for 48 hr holter monitior

93224 is to be billed at one unit for 48 hrs