Description of CPT Modifier 80:

To recognize the assistance of a surgical assistant, submit CPT modifier 80.
A physician may help another doctor in conducting a process during certain processes. The operating surgeon’s assistant would reveal the same surgical procedure as the surgical team. The assistant surgeon is normally present during the operational phase or a significant portion of it to help the operating physician. Non-physicians helping at surgery should not use Modifier 80.

https://billingexecutive.com/an-overview-of-modifier-80-assistant-surgeon/

medical billing, modifier 80