Split billing is the division of a bill for service into two or more parts. Bills may be split to divide work between clients, payers or for reimbursement to different service providers for performing a shared service.
Medical billing.
Add-on codes.
Add-on codes are additional work associated with a primary service or procedure. Add-on codes can and should only be billed when the provider has performed and billed the primary service. CMS guidelines and coding textbooks agree that add-on codes should be on the same claim as the primary code. 
References.
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