Patient Portal Education – Lander Medical Clinic Appointments are available in both the Riverton and Lander offices. Call us at (307) 332-2941 or (307)856-6591 Patient Portal Our front desk staff can help register you in office for the Patient Portal. Ask us how! DA: 46 PA: 28 MOZ Rank: 90. Lander Medical Clinic landermedicalclinic.com.