It sounds like you are billing for the physicians charges which would go on a CMS1500 form. Plan oversight can be billed using CPT codes 99339 or 99340.
Codes 99339 and 99340 report development of complex and multidisciplinary care modalities and/or revision of care plans, review of subsequent reports of patient status, review of related laboratory and other studies, communication (including telephone calls) for purposes of assessment or care decisions with health care professional(s), family member(s), surrogate decision maker(s)(e.g. legal guardian) and /or key caregiver(s) involved in the patient’s care, integration of new information into the medical treatment plan and/or adjustment of medical therapy.
Hope that helps.
Michele