National Guideline ClearinghouseNGC is an initiative of the Agency for Healthcare Research and Quality (AHRQ) External Web Site Policy, U.S. Department of Health and Human Services. NGC was originally created by AHRQ in partnership with the American Medical Association and the American Association of Health Plans (now America's Health Insurance Plans [AHIP]). The NGC mission is to provide physicians and other health professionals, health care providers, health plans, integrated delivery systems, purchasers, and others.