The following is from CareFirst website (our BCBS), looks like you contact clearinghouse:
Electronic Fund Transfer (EFT)
The following clearinghouses also offer electronic fund transfer (EFT) services (By clicking any of the links below, you will leave the CareFirst website and access a vendor website. The vendor is solely responsible for the services it provides.):
Emdeon at 866-369-8805
RealMed at 877-927-8000, ext. 1201
Allscripts (enrollment performed by Payspan) at 877-623-5706, ext. 1 or ext. 2
RelayHealth (enrollment performed by Payspan) at 800-527-8133, option 2
The following information is required when contacting your clearinghouse to enroll for EFT services:
National Provider Identifier (NPI) ? Billing NPI
Provider Federal Tax Identification Number (TIN)
Reason for Submission : New/Change/Cancel Enrollment
Requested EFT Start/Change/Cancel date
Practice/Provider Name
Financial Institution Information (including Financial Institution Name, Financial Institution Routing Number, Type of Account (Checking/Savings), Provider's Account Number
With EFT transmission, CareFirst will discontinue the delivery of your paper remittance notice. Your Electronic Remittance Advice (ERA-835) will be delivered by your clearinghouse and will be your new payment voucher.
The ERA-835 will include payment details and HIPAA adjustment and remarks codes necessary for you to reconcile your patient accounts. If a copy of this information is needed, you should contact your clearinghouse.