The Secondary ID is populated in Box 24J and Box 33b on a paper claim and the corresponding loop and segments on an electronic claim.
To add Secondary ID, select the required provider from the Provider list.
Clicking on the Setup Secondary ID button placed towards the top right side of the provider screen will bring up the Setup Secondary Insurance ID screen in a new window.
Now click on the Add Insurance 
button as highlighted in the above screenshot.
On the Insurance Accepted by Provider screen that follows, enter the insurance company name, the Secondary ID/ PIN (in all three fields: PIN, Group ID, and Secondary ID) and also select the relevant Secondary ID type.
For example: If the PIN you’re entering is a BCBS ID, select the type as Blue Shield ID; if PIN is a Commercial ID, choose Provider Commercial Number from the ID type list.
Click on the Save button upon entering all the required fields.
Note: For each provider, the insurance-specific Secondary ID would need to be set up separately.