What it is:
Box 17b is where the NPI number of the referring, ordering, or supervising provider is entered. The NPI number refers to the HIPAA National Provider Identifier number.
Therabill will use the value from the NPI field that is in the in the Edit Referring Provider form to build the data for Box 17b.
On the top menu bar, select Providers / Referring Providers. Click the blue pencil for the desired Referring Provider. You will now see the Edit Referring Provider form. In the NPI line, enter the NPI for the referring provider in the available box.