Billing primary codes/add-on codes on separate claims for same date of service

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If one provider performed the primary procedure, and a different provider on the same date of service performed the add-on procedure, is it possible to bill these codes on two claims under each individual provider's credentials within the same facility?

For example: Dr.A performs primary code 93458 and then Dr.B performs 93571 add-on code on the same date of service in the same facility. Could these codes be billed on two separate claims?

Thank you


True Blue
Beaverton OR
Best answers
CMS says no:

"An add-on code is a HCPCS/CPT code that describes a service that, with one exception (see CR7501 for details), is always performed in conjunction with another primary service. An add-on code with one exception is eligible for payment only if it is reported with an appropriate primary procedure performed by the same practitioner. An add-on code with one exception is never eligible for payment if it is the only procedure reported by a practitioner."

In order to bill an add-on code, the provider must perform both the primary code and the add-on code. The exception above refers to a Critical Care situation.

AMA CPT 2018 Standard book:

"Add-on codes are always performed in addition to the primary service or procedure and must never be reported as a stand-alone code. All add-on codes in the CPT code set are exempt from the multiple procedure concept (modifier 51)."

Hope that helps!