What are the maximum amount of units payable for Q codes (example: Q4045) by insurance companies?

When my doctor puts a splint on a patient, our billing department is trying to bill multiple units of supply Q codes to one splint application code for reimbursement.

For example: Dr. places a short leg splint on a patient, we bill CPT 29515, our MA informed us that 5 rolls of material were being used for these splints, therefore we tried to bill Q4045 with 5 units in addition to our one 29515… Is this wrong?

I can’t find any article that states how many units that Medicare (or any insurance company) will pay for supplies…

Is there anyone out there who has more information on this issue?… Is anyone getting paid for more than one unit of their cast/splint supplies?