A Medical Loss Ratio (MLR) is a calculation used to loosely gauge the efficiency and profitability of a health insurance plan. The measurement determines what portion of the money consumers pay in premiums is spent on providing health care services or improving the quality of care delivery. A higher MLR is thought to indicate a higher quality insurer because a larger portion of the company’s funds are spent on providing care. However, this is not necessarily the case if an insurer succeeds in keeping a healthier-than-expected risk pool.