MORE IOWANS CHOOSE WELLMARK. Let's talk about your health insurance options and find the right plan for you. Barton Showalter Showalter Insurance Agency (319) 777-3609 85 Sugar Creek Lane, Suite 4 North Liberty, IA 52317 An Authorized Independent Agent for Wellmark. lowa Wellmark Blue Cross and Blue Shield of lowa is an independent licensee of the Blue Cross and Blue Shield Association. W-5019524 08/18 MORE IOWANS CHOOSE WELLMARK. Let's talk about your health insurance options and find the right plan for you. Barton Showalter Showalter Insurance Agency (319) 777-3609 85 Sugar Creek Lane, Suite 4 North Liberty, IA 52317 An Authorized Independent Agent for Wellmark. lowa Wellmark Blue Cross and Blue Shield of lowa is an independent licensee of the Blue Cross and Blue Shield Association. W-5019524 08/18