Bypassing CWF Edits on Inpatient Medicare Part B Ancillary 12X Claims: Effective Date Change

Related CR Release Date: July 31, 2025 
MLN Matters Number: MM14185
Effective Date: January 5, 2026 – Effective for any date of service processed on or after January 5, 2026
Related Change Request (CR) Number: CR 14185
Implementation Date: January 5, 2026 
Related CR Transmittal Number: R13341OTN

CR 14185 tells you about:

  • The bypass logic applies to claims processed on or after January 5, 2026
  • MACs will have time to reprocess claims you resubmit that they previously rejected in error

Make sure your billing staff knows about these updates to the effective date for the bypass of Common Working File (CWF) editing on inpatient Medicare Part B ancillary 12X claims previously added with CR 13810.

View the complete CMS Medicare Learning Network (MLN) Matters (MM)14185.

Last Updated Aug 14 , 2025