October Medicare and Medi-Cal claims changes combine service dates, systems updates and Noridian limitations
Sep 27, 2026 edition · GC-2026-0012 · Published 2026-09-27 · Version 2 · Final
October claims preparation combines laboratory and Medi-Cal applicability dates, October 5 systems updates and selected Noridian service limitations on October 2–4.
What happened
CMS’s August 27 MLN Connects newsletter describes October 1, 2026 clinical laboratory fee schedule and CLIA updates, including annual and quarterly CLIA edits, new waived-test updates and new or deleted CPT codes. It also points home-health users to the October grouper release, version 07.2.26. The official August 27 R13934OTN listing, CR 14429, identifies the October HIPAA EDI front-end update with October 5 implementation. Separately, R13929CP, CR 14588, implements the October Medicare Physician Fee Schedule Database changes on October 5. That instruction carries a January 1, 2026 general service effective date but includes record-specific exceptions in its code attachment, so not every individual code change starts on the same date.
The physician-fee update changes payment-file records and directs contractors not to search for previously paid claims to retract or retroactively pay them; contractors must adjust affected claims brought to their attention and give providers 30 days’ notice before implementing the changes. For the October transition, the September 3 CMS newsletter reiterates that notice and adjustment process. DHCS’s August 31 notice applies the Medi-Cal NCCI edits to claims received on or after October 1. CMS MM14561 gives October 1 general effectiveness and October 5 implementation for SNF consolidated-billing edits, while individual table entries carry their own dates. Noridian’s September 1 notice schedules Common Working File dark days October 2–4, limiting specified portal claim-status, reopening and redetermination functions, selected IVR services and eligibility-related customer assistance; it does not announce a complete shutdown of all portal services.
Scope and timing
- Authority status
- Final
- Applicability
- Directly applicable
- Audience
- Health systems, Provider networks
- Jurisdiction
- Federal, California
- Affected functions
- Revenue Cycle, IT, Coding, Finance
- Responsible owner
- Revenue Cycle
- Recorded date
- 2026-10-01
- Date type
- effective
Why it matters
Different service, claim-received and systems dates can affect which edits or payment records apply to a claim. A release calendar alone cannot demonstrate accurate pricing, correct claim routing or completion of retrospective adjustments.
Recommended action
Assign owners for laboratory/CLIA, EDI, physician-fee and home-health changes. Verify the applicable code-record dates and installed versions, reconcile representative claims, and bring affected physician-fee claims to the MAC rather than assuming an automatic search. Use the Medi-Cal claim-received boundary, follow CMS’s October 5 SNF implementation date with table-specific exceptions, and plan affected Noridian inquiries around October 2–4.
Sources
- Transmittal R13934OTN, change request 14429, HIPAA electronic data interchange front end updates for October 2026Official · Centers for Medicare & Medicaid Services · 2026-08-27 · Source review 2026-08-31
- Transmittal R13929CP, change request 14588, quarterly update to the Medicare Physician Fee Schedule Database, October 2026Official · Centers for Medicare & Medicaid Services · 2026-08-27 · Source review 2026-08-31
- MLN Connects newsletter, August 27, 2026Official · Centers for Medicare & Medicaid Services · 2026-08-27 · Source review 2026-08-31
- MLN Connects, September 3, 2026Official · CMS · 2026-09-03 · Source review 2026-09-06
- MM14561, SNF consolidated billing October updateOfficial · CMS · 2026-09-01 · Source review 2026-09-06
- NCCI quarterly update effective October 1Official · DHCS · 2026-08-31 · Source review 2026-09-06
- Portal, IVR and customer-service limited availability October 2-4Official · Noridian, Jurisdiction E · 2026-09-01 · Source review 2026-09-06
- R13929CP complete CMS transmittalOfficial · Centers for Medicare & Medicaid Services · 2026-08-27 · Source review 2026-10-15
Complete edition and supplemental material
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