National health insurance is aimed at the benefit of society as a whole as it is imposed as mandatory on everyone to disperse the cost of medical care among all those insured. Workers and employers of a business, public workers, and teachers become insured through their employers. This content provides information on the requirements of employer-sponsored insurance, the range of insurance coverage, e.g. medical expenses, pregnancy/childbirth, etc., and the calculation and payment of health insurance premiums. In addition, general legal information related to national health insurance, including how to resolve insurance premium disputes, is provided.