Do you mean a scenario in which the group practice has a surgeon A using surgeon B as an assistant? Then, surgeon B sees the patient during the global period for a post operative visit and no other unrelated problems are addressed? Surgeon A, B or any other surgeon in the group can't bill for the global follow up.
Think of it like this for a total hip arthoplasty for example, if the CPT 27130 allows assistant-at-surgery to be billed and paid, Surgeon A & Surgeon B have billed a global CPT 27130 therefore, the patient is also global to them.
The same would be true if a PA was acting as an assistant and the patient followed up with the PA in the same group practice for global visits post op, they don't get to bill an E&M.
If surgeon B assisted surgeon A but was from another practice and was going to provide the follow up care only this would be a different scenario involving transfer of care and possibly 54/55 modifiers.
40 - Surgeons and Global Surgery (Rev. 1, 10-01-03) B3-4820
30.6.5 - Physicians in Group Practice, 30.6.6 - Payment for Evaluation and Management Services Provided During Global Period of Surgery
Make quick and easy work of determining which procedures and services are bundled and when. Most coders, billers, and clinicians are familiar with the The global surgical package includes all the necessary services normally furnished by a surgeon before, during, and after a procedure.
The global surgical package, also called global surgery, includes all the necessary services normally furnished by a surgeon before, during, and after a procedure. Medicare payment for a surgical procedure includes the pre-operative, intra-operative, and post-operative services routinely performed by the surgeon or by members of the same group with the same specialty.
There could be exceptions to this depending on if the provider was only providing surgical care but not post-operative care like (54/55 mod). There are some other exceptions. Teaching facility rules could be different too.