The Centers for Medicare & Medicaid Services (CMS) requests that Medicare Administrative Contractors (MACs) discriminate and reject some CWF Provider Queries according to CMS protocol and otherwise evaluate CWF information.
Subject: Common Working File (CWF) to Modify CWF Provider Queries to Only Accept National Provider Identifier (NPI) as valid Provider Number
Release Date: July 27, 2017
Effective Date: January 1, 2018
Implementation Date: January 2, 2018
Special Notes: N/A