Date
In the 2019 Applied Behavior Analysis (ABA) CPT® Code Changes bulletin, the maximum quantity refers to the maximum number of units per day that can be billed. The unit for each ABA procedure code is 15 minutes, as noted in the Brief Description column. For example, the maximum quantity for 97151 is 8 units per day. Eight 15-minute units is equivalent to two hours. The maximum quantity of 97152 is 32 units per day. Thirty-two 15-minute units is equivalent to 8 hours.