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  2. Resource-based relative value scale - Wikipedia

    en.wikipedia.org/wiki/Resource-based_relative...

    The data are effectively copyrighted by the AMA, but its use is required by statute. Although the RBRVS system is mandated by the Centers for Medicare and Medicaid Services (CMS) and the data for it appears in the Federal Register , the American Medical Association (AMA) maintains that their copyright of the CPT allows them to charge a license ...