USA Vein Clinics located in Thousand Oaks, CA is a state-of-the-art facility dedicated to the treatment of venous insufficiency such as varicose veins and spider veins. Since venous insufficiency is a serious medical condition, it is important to know that the diagnosis and treatment of venous diseases are covered by Medicare and in each vein center, cardiovascular doctors specialize exclusively in problems with circulation to provide a comprehensive evaluation and treatment plan utilizing the most modern equipment and individual approach to each of our patients.