CMS Set to Implement New Common Working File Edits to Identify Ambulance Services Provided in Connection with Outpatient Hospital Services that should be bundled to the SNF under Consolidated Billing. In a Member Advisory issued last week, the AAA provided an update on a series of new Common Working File (CWF) edits intended to identify ambulance transports furnished in connection with outpatient hospital services that are properly bundled to the skilled nursing facility under the SNF Consolidated Billing regime. These new edits are set to go into effect on April 1, 2019.  In our discussion of the implementation specifics, we attempted to answer the question of what would happen when an ambulance claim is submitted prior to the receipt of the associated hospital outpatient claim, and where the associated hospital claim eventually hit Medicare’s system. Specifically, we indicated as follows: “The Transmittal contains further instructions that the CWF be updated to identify previously rejected ambulance claims upon receipt of an associated hospital claim for the same date of service that contains an Exempted Code.  Once identified, the Shared System Maintainer (SSM) is supposed to adjust the previously rejected or denied ambulance claim.  At this point, the nature of that “adjustment” is…

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