Healthfirst - Green Acres Mall is the provider-sponsored health insurance company that serves more than 1.2 million members in downstate New York. Healthfirst - Green Acres Mall offers top-quality Medicaid, Medicare Advantage, Child Health Plus, or Managed Long Term Care plans. Healthfirst - Green Acres Mall Leaf Qualified Health Plans or the Healthfirst - Green Acres Mall Essential Plan are offered on NY State of Health, The Official Health Plan Marketplace.