CMS replaces the October EDI transmittal to update its 276/277 attachment
Oct 11, 2026 edition · GC-2026-0108 · Published 2026-10-11 · Version 3 · Final
The current October EDI instruction is September 28 R13977, which replaces R13967 to update the 276/277 flat-file attachment. October 1 effectiveness and October 5 contractor implementation are past milestones, so remaining work concerns actual version and exception validation.
What happened
R13977 expressly rescinds September 18 R13967 and updates the 276/277 flat-file attachment, leaving the other instructions unchanged. It retains October 1 effectiveness and October 5 implementation for the quarterly CCEM front-end edits used by Medicare contractors and shared systems. The earlier two-error correction belongs to the superseded September 18 version; the current cover describes an attachment update. That distinction supports identifying the actual installed release rather than treating every September file as equivalent.
The instruction requires the attached spreadsheets to replace prior versions and explains that the change-log tab contains current-version modifications. Contractors need not repeat completed work but must incorporate the updates. Business requirements address TA1 and 999 acknowledgments, test data, and translator/CCEM flat-file layouts, including 276/277. These are contractor technical directions; the provider action is to verify clearinghouse or vendor implementation and investigate relevant acknowledgment or claim-status exceptions. A published implementation date alone does not establish that an organization installed the correct attachment.
Scope and timing
- Authority status
- Final
- Applicability
- Directly applicable
- Audience
- Health systems, Provider networks
- Jurisdiction
- Federal
- Affected functions
- Revenue Cycle, IT, Compliance, Finance
- Responsible owner
- Revenue Cycle
- Recorded date
- 2026-10-05
- Date type
- implementation
Why it matters
Clearinghouses, billing systems, and revenue-cycle teams that implemented the superseded spreadsheet may apply incorrect front-end edits or misread claim-status responses beginning October 1.
Recommended action
Confirm that the clearinghouse or vendor deployed R13977OTN and its current 276/277 attachment. Compare affected front-end and claim-status scenarios with the replacement change log, review actual acknowledgments and exceptions, and document any remaining release or configuration gap.
Implementation playbook
- Replace the superseded 276/277 edits spreadsheet in implementation materials. Revenue Cycle · Due 2026-09-23
- Regression-test corrected front-end edit and claim-status scenarios with vendors. IT · Due 2026-09-27
- Confirm production deployment and exception monitoring before the effective date. Revenue Cycle · Due 2026-10-01
Sources
- HIPAA Electronic Data Interchange Front End Updates for October 2026Official · Centers for Medicare and Medicaid Services · 2026-09-18 · Source review 2026-09-20
- CMS Transmittal R13977OTNOfficial · Centers for Medicare & Medicaid Services · 2026-09-28 · Source review 2026-10-11
Complete edition and supplemental material
This finding in the complete approved report →Regulatory horizons, CIA trends and implementation trackers remain in the full report.
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