My first question would be what specialty is your PA working under? It is possible that your PA working under 1 specialty just happened to see the patient at the same time as a neurologist (different specialty). If so, as long as both providers had a reason to see the patient, and each have completed documentation, there is no reason you should not bill for your PAs services. For example - your PA is working for the IM admitting physician, or ortho, or GI, etc. Then your PA had a reason to see the patient and provided care, so bill for it under your PA.
If your PA works for neurology and was helping out a neurologist in a different practice for some reason, then I would not consider that service medically necessary and would not bill for it.