 Priority Health is a subsidiary health plan with one million members.Spectrum Health is the largest employer in West Michigan with 31,000 staff, 4,200 physicians and advanced practice providers, including 1,600 members of the Spectrum Health Medical Group, and 3,200 volunteers.In 2012, Spectrum Health System was recognized as one of the "Top 50 Integrated Health Care Networks" in the United States by IMS Health.