If a payer requires a specific ID in box 33B of the CMS 1500 form, you can set this as a requirement on the payer.
Go to Settings > Payers > Open the payer by clicking the three dots on right > Transmission Rules
Any insurance coverage with this payer will require a value in the 'Provider Secondary ID' field.
If the coverage lacks a value in the 'Provider Secondary ID' field, you will see an error in the Billing Queue.
Once the field is filled out, click Refresh Claim Info and the claim can be moved to the Claims tab.
The claim will be submitted with the 'Provider Secondary ID' value:
You can also add this on existing claims by opening the claim in the Claims tab and entering a value in the 'Provider Secondary ID' field under the insurance.