Number: 14553
Release Date: August 21, 2026 
Effective Date: January 1, 2027 
Implementation Date: January 4, 2027 
Transmittal Number: R13932OTN

CR 14553 tells you about:

• Your MAC processes several Claim Adjustment Reason Codes (CARCs) systematically 
• CMS is directing Medicare Part A MACs and shared systems on which CARCs will process automatically and which MACs will suspend for manual review or deny

Make sure your billing staff knows about these Medicare Secondary Payer (MSP) claim processing updates.

View the complete CMS Medicare Learning Network (MLN) Matters (MM)14553.