When utilizing the ePS clearinghouse, your payer IDs may change. There are several national payers, such as Aetna, Cigna, Humana, and United Healthcare, that keep the same payer ID number across all clearinghouses.
The best source of information is the eProvider Solutions payer list, which can be found following this link: EProvider Solutions Payer List
Once on the link, you can download either a PDF or an MS Excel listing.
How to search for Payer IDs within DrChrono
They will show at the top in a search within the patient's account:
And under Billing > Payer Search: