Job Description Job Description Description Part-Time Nurse Practitioner/Physician Assistant – Springfield, IL At MedMark, we take a patient-centered approach to opioid addiction treatment. In the first days of treatment, we’ll design an individualized plan that’s suited to patient needs. We don’t just offer rehabilitation counseling and methadone treatment, MedMark clinics also provide physical evaluations, drug screenings, case management services, relapse prevention education, and after-care