title: Split billing
text: # Split billing
  
  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.
  
  