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  Play media comment. BACKGROUND: The Centers for Medicare and Medicaid Services (CMS) administers the Medicare program. CMS employs Medicare contractors, including Wisconsin Physicians Service (WPS), to process and pay hospital outpatient claims using the Fiscal Intermediary Shared System (FISS). CMS implemented an outpatient prospective payment system (OPPS) for hospital outpatient services. Under the OPPS, … Read more