There are two sections the NPDB can be found.
First, the NPDB can be logged in the Appointment Workflow.
TIP: The NPDB is best logged and kept in the Appointment Workflow so everything is in one place. The NPDB you log should be associated to a specific appointment date and time frame.
To find, begin by searching for the provider profile you are working on.
Go into the Appointment & Privileges tab
Go to the Sanction Checks tab
See below where you can add the NPDB query
The other place NPDB would be is directly in the Sanctions tab.
For some reason, if the NPDB is missing from the Appointment Workflow you can find it here.