CMS Releases Alert for Changes to Response File Naming Convention

CMS has released an alert dated October 27, 2014 detailing changes to the naming convention for claim, TIN and query response files that will take effect April 6, 2015. In order to ensure that filenames remain unique, CMS is modifying the time, or “T,” node of the filename convention. Instead of four digits representing seconds and centiseconds, a number from 0000 to 9999 will be inserted in the filename.

CMS had recently enabled this change in their production systems and it was detected by the Helios Section 111 reporting platform, MedicareConnect. After Helios brought the matter to CMS’s attention, and reminding them that the response file specification was published in the User Guide, CMS agreed to revert back to the previous coding and publish an alert to provide the normal six months of advance notice.

The full alert can be found at the following address:

For more information, please contact Frank Fairchok, Senior Manager of MedicareConnect at

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