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If you're billing for a service performed by auxiliary personnel and not performed personally by the provider, then by definition, you are billing 'incident to'. And if the patients have left before the provider has evaluated them for the presenting problem, then the 'incident to' requirements have not been met and services can't be billed, at least under CMS rules.
Note that it states that to bill this code the "patient must be seen for a problem that has already been diagnosed with a treatment plan established by the physician/ nonphysician provider."
Also you can refer to this CMS publication for a summary of the 'incident to' rules. On page 1 and 2 that "to qualify as “incident to,” services must be part of your patient’s normal course of treatment, during which a physician personally performed an initial service and remains actively involved in the course of treatment."