Southern Plains Medical Group Online Patient Portal. ... (405) 224-8111. SPMG Southern Plains Medical Center in Chickasha. 2222 W Iowa Ave, Chickasha, OK 73018. Directions (405) 920-1788. SPMG Skin Cancer Specialists of Oklahoma ... (405) 247-6685. SPMG Family Medical Clinic in Anadarko. 1104 E Central Blvd., Anadarko, OK 73005. Directions (405 ....