(NCCI, NYCIRB) A system of insurance risk classification based on industrial or occupational categories, supported by the National Council on Compensation Insurance and in use in about 40 states where private insurance is available. The system, which includes several thousand 4-digit numeric codes (with more than 700 classifications in use in New York), is extensively used to identify an employer’s rate making class(es) and establish basic pricing for workers’ compensation insurance.