Whatever you have entered in the units text box on the add/edit session form, at the time you create an insurance claim in Therabill, will go out as the number of units for that service line.
How do I know how many units to use?
That is a good question and a hard question to answer. Typically, procedure codes (CPT codes) have a time associated with them. For example, the description for 90837 by the American Medical Association is "Psychotherapy with patient and family member - 60 minutes". Therefore, if you indicate 1 unit, then you are indicating that you did 1 unit of 90837, which translates in to 60 minutes.
Some codes are not time based at all and you would just enter 1 unit if you performed the procedure.
Where it gets super tricky...
Some payers make their own rules for the number of units that they want you to bill them. That is, one payer may require 1 unit for 60 minutes, while another payer (for the same procedure code) may want you to bill 4 units for 60 minutes (in this case, they are saying 1 unit = 15 minutes). How many units to bill to different insurance companies is one of the things, as a biller, you will just need to learn over time. In the beginning, while you are learning, you may need to call the insurance company for direction on the number of units to use.
Primary wants 4 units and Secondary wants 1 unit?
If your patient has primary insurance and secondary insurance and they both want different units for the same procedure, then you will need to remember to change the units (on the edit session form in Therabill) prior to submitting to secondary. Whenever you create a claim in Therabill, Therabill puts the current information that you have on file for the session on the claim. Therefore, you will want to edit the number of units prior to creating the secondary claim.