Medical assistants are unlicensed individuals who perform non-invasive routine technical support services under the supervision of a licensed physician and surgeon, podiatrist, physician assistant, nurse practitioner, or nurse midwife in a medical office or clinic setting.edical assistants are unlicensed individuals who perform non-invasive routine technical support services under the supervision of a licensed physician and surgeon, podiatrist, physician assistant, nurse practitioner, or nurse midwife in a medical office or clinic setting.