Since prescription drugs are a major driver of healthcare spending, increasing by 12 percent last year, and the Centers for Medicare and Medicaid Services is among the largest purchasers, the agency is creating a new online dashboard to increase transparency and address affordability.
The dashboard will look at Medicare prescription drug spending for Parts B and D in such categories as spending per user and drugs with the highest cost increases.
CMS intends to release a similar list for Medicaid next year, it said.
Part D's, 3,761 drugs had a total program spending of $121.5 billion, according to CMS. Of those, 115 drugs had a total program spending of $76.7 billion, representing 63 percent of total spending.
The 15 drugs with the highest spend accounted for $29.1 billion and 24 percent of program spending.
CMS said 540 represent drugs with a 25-percent cost increase for $13.7 billion, or 11 percent of program costs.
The Part D drug, Humira, used to treat rheumatoid arthritis, had more than 50,000 beneficiaries using it in 2014, with total annual Part D spending per user of approximately $24,000 and total spending of $1.2 billion, CMS said.
In comparison, about 33,000 beneficiaries were using Sovaldi, which is used to treat Hepatitis C infections, with total annual spending per user of $94,000 and total Part D spending of $3.1 billion.
For Part B, 606 drugs represent $21.5 billion in spending, with 21 representing the highest spending at $12.8 billion, or 60 percent of program costs.
The top 15 highest spending drugs totalled $11.5 billion, and represented more than half, 53 percent of program costs.
For all drugs included on the list, CMS is displaying relevant spending, utilization, and trend data and also drug product descriptions, manufacturers, and clinical indications.
For the dashboard, CMS is identifying 40 drugs in the Medicare Prescription Drug Program under Part D and 40 drugs administered by physicians and other professionals in the Medicare fee-for-service program under Part B.
The drugs are selected because they rank in the top 15 in terms of total program spending or they are associated with a high annual per user spending.
The relatively small set of medications presented on the dashboard represents a very large proportion of program spending, including 33 percent of all Part D spending and 71 percent of Part B drug spending in 2014, CMS said.