If you need to stop a service/HCPCS from it's rental process you will need to go to the patient's file and select the Rental tab.

You will be able to see all the active rentals with the patient. To stop a current rental, select the red "Stop Rental" button next to the item necessary. 

Now you will have to enter the reason for stopping a rental. Once complete select the red STOP sign.

Your item will now show as Inactive and will no longer generate rental invoices.