Requires that a health benefit plan that provides coverage for prescription drugs shall ensure that a required copayment or coinsurance applicable to a drug on a specialty tier does not exceed $150 per month for up to a 30-day supply of the specialty drug or $300 for a 90-day supply. On July 1 of each year, the limit on a required copayment or coinsurance applicable to a drug on a specialty tier shall increase by a percentage equal to the percentage change from the preceding year in the medical care component of the March Consumer Price Index for All Urban Consumers, Washington-Baltimore metropolitan area, as published by the Bureau of Labor Statistics of the United States Department of Labor.