What is a rendering provider?
The rendering provider is the healthcare professional who actually delivers a service to a client, and on an insurance claim they may be a different party than the billing provider, depending on how the practice is structured.
On a claim, the rendering provider is identified separately from the billing provider. In ABA that split is routine: an RBT or BCBA delivers the session while the group practice or agency bills for it under its own identifiers.
Both parties are identified by their NPIs, and payers check that the rendering provider is appropriately credentialed and permitted to deliver the service being billed. Which clinician belongs in that field — the technician or the supervising BCBA — depends on the payer and the service.
Getting that field wrong is a routine source of denials, so practices keep provider records, credentials, and payer-specific rules current alongside their scheduling and billing data.