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Generate an explanation for the given claim using the provided supporting material from the paragraph. Please consider the following points while generating an output. 1) The claim will always have supporting proof in the paragraph, and the paragraph will have a clear point of view supporting the claim. 2) There can be instances where direct correlation to the claim is not available. Make use of the sentences in the paragraph to provide a corresponding output supporting the claim. 3) The explanation should be at least one and at most twelve sentences long.

Paragraph: The company has held back on marketing the pharmacy benefit plan while it talks to these groups, CVS said. The plan, launched a year ago, is based on analyses by the Institute for Clinical and Economic Review (ICER), a Boston-based group that assesses effectiveness of drugs to determine appropriate prices. Using ICER's cost effectiveness assessment, CVS decides whether to include second or third medicines entering the market if there are already similar ones in the plan. Opposition to the CVS plan is part of much broader concerns cited by drug companies and advocacy groups, many of which receive funding from the pharmaceutical industry. Some say that ICER's analysis based on additional years of "quality life" gained from a given treatment is arbitrary and disregards the costs of drug development and patient needs. More than 50 groups, including drugmakers, PhRMA, the industry's main lobby group, and other advocacy groups, have provided comment during a public input period included in a review by ICER of its assessment methods. Many asked ICER to eliminate price recommendations from its efficacy analyses. ICER has defended its methods, which are based on a widely-used cost effectiveness analysis. The soft rollout of CVS' ICER-related product comes as employer health plan sponsors - its biggest clients - are showing increased concern over their cost for new high-priced drugs, and are considering refusing to pay for them at all, CVS Chief Medical Officer Troy Brennan said in a recent interview. If corporate customers follow through on that threat, CVS said it could change tactics with the plan. Rising drug prices, particularly for expensive specialty treatments for severe or deadly conditions, have pushed annual U.S. healthcare spending to $3.65 trillion, and made them unaffordable for many individuals. Earlier this year, Novartis AG (NOVN.S) launched Zolgensma, a more than $2 million gene therapy for a rare but deadly disease called spinal muscular atrophy. The new CVS program, cited as an example of ICER's growing influence on U.S. drug pricing, would not apply to such a breakthrough treatment. It is a tiny plan by CVS standards as the company manages pharmaceutical benefits for more than 102 million people and also owns Aetna insurance and a national pharmacy chain. The plan's scope is limited to so-called me too drugs, those where similar effective treatments already exist, and aims to pressure drugmakers to set lower prices. For example, two of three very similar drugs for migraine approved in 2018 could have been excluded, but drugmakers set prices ICER deemed cost effective. CVS has limited sales and marketing for the plan while it talks to patient groups who oppose it. About 240,000 CVS employees and a few large clients' employees are enrolled thus far. The company declined to comment on exact membership. "We are not widely promoting this program," Brennan said, adding that CVS is working to address patient groups' concerns. Meanwhile, Brennan said some employers are considering refusing to pay for million-dollar treatments like gene therapy. They are saying, "I'm not going to cover these kinds of therapies no matter what their comparative effectiveness is if they've got a really high cost." Large healthcare consultant and brokerage Mercer said it has begun to field similar concerns. "We have certainly gotten some plan sponsors saying 'What if we don't cover specialty drugs?'" said David Dross, who runs Mercer's managed pharmacy practice. Two years ago, it never received any such questions, he said. Steve Wojcik, an executive with the National Business Group on Health which represents large employers, said he does not believe many will take that drastic step. Still, ICER President Steven Pearson said employers tell him they worry about their ability to cover everything and have suggested they might drop some high-cost treatments. He said employers can use cost effectiveness analysis to help them manage their spending. ICER has responded to outside criticism by meeting with patient advocates and by adding new measurements for a drug's effectiveness, such as the value of life years gained, which does not focus on quality of life improvements, Pearson said. Since 2015, ICER has published up to a dozen reviews each year of drugs and classes of medicines. Most U.S. private insurers now use ICER clinical and cost analyses to inform coverage negotiations with drugmakers. ICER funding primarily comes from a non-profit foundation, but drug companies and health insurers provide some funds for ICER-related activities. Claim: CVS drug coverage plan based on outside pricing review is off to a slow start.
Output:
A CVS Health Corp (CVS.N) health plan that uses an outside drug pricing group to help it decide whether to cover certain new medicines has gained little traction with customers, according to its top medical executive, and has drawn fierce criticism from patient advocacy groups.