2025 Medicare Transmittals and Implementation Dates

CMS Transmittals

Published December 31st, 2025

Detected March 13th, 2026

Summary

The Centers for Medicare & Medicaid Services (CMS) has released its 2025 transmittals, detailing updates and implementation dates for various Medicare programs. These documents outline changes to payment systems, data reporting, and operational procedures for healthcare providers.

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What changed

The Centers for Medicare & Medicaid Services (CMS) has published a compilation of its 2025 transmittals, which serve as official instructions and guidance for Medicare programs. These transmittals include details on implementation dates for new models, updates to payment systems such as the End-Stage Renal Disease (ESRD) Prospective Payment System (PPS), and changes to general overpayment provisions. Specific examples include the Wasteful and Inappropriate Service Reduction (WISeR) Model Prior Authorization, with an implementation date of September 30, 2025, and updates to the Medicare Severity – Diagnosis Related Groups (MS-DRG) classification system effective April 6, 2026.

Healthcare providers must review these transmittals to understand upcoming changes that may affect billing, reimbursement, and operational procedures. Key implementation dates range from late 2025 through 2026, requiring proactive planning and system adjustments. Failure to comply with the updated requirements outlined in these transmittals could lead to payment disruptions or other compliance issues. Providers should pay close attention to the specific subject matter of each transmittal relevant to their services and ensure their staff are educated on the new policies.

What to do next

Review 2025 Medicare transmittals for relevant updates
Identify specific changes impacting billing, reimbursement, and operations
Plan and implement necessary system and process adjustments based on implementation dates

Source document (simplified)

2025 Transmittals

Displaying 1 - 10 of 332 Show entries: 5 per page 10 per page 25 per page 50 per page 100 per page -- All -- Filter On
| Transmittal # | Issue Date | Subject | Implementation Date | CR # | Provider Education | Provider Education Release Date | Provider Education Revision Date |
| --- | --- | --- | --- | --- | --- | --- | --- |
| R13570DEMO |
2025-12-31
| Implementation of Wasteful and Inappropriate Service Reduction (WISeR) Model Prior Authorization… |
2025-09-30
| 14205 | | | |
| R13569OTN |
2025-12-31
| Integrated Data Repository (IDR) Daily Snapshot File |
2026-03-31
| 14256 | | | |
| R13516BP |
2025-12-31
| Implementation of Changes in the End-Stage Renal Disease (ESRD) Prospective Payment System (PPS… |
2026-01-05
| 14313 | MLN Matters Article MM14313 |
2025-12-31
| |
| R13566DEMO |
2025-12-30
| Implementation of Wasteful and Inappropriate Service Reduction (WISeR) Model Prior Authorization… |
2025-09-30
| 14205 | | | |
| R13562CP |
2025-12-23
| April 2026 Update to the Medicare Severity – Diagnosis… |
2026-04-06
| 14337 | MLN Connects Newsletter Message |
2026-01-08
| |
| R13564OTN |
2025-12-23
| Extensions of Certain Temporary Changes to the Low-Volume Hospital Payment Adjustment and the… |
2026-01-14
| 14341 | | | |
| R13561FM |
2025-12-23
| Chapter 3 Sections 170-190 - General Overpayment Provisions - Update of Citations and… |
2026-01-26
| 14305 | | | |
| R13510FM |
2025-12-23
| Updates to Internet Only Manual, Publication 100-06, Chapter 4, Section 70.16 (Debt Close-Out)… |
2026-01-26
| 14218 | | | |
| R13565DEMO |
2025-12-23
| Implementation of Wasteful and Inappropriate Service Reduction (WISeR) Model Prior Authorization… |
2026-01-05
| 14205 | | | |
| R13478CP |
2025-12-23
| File Conversions Related to the Spanish Translation of the Healthcare Common Procedure Coding… |
2026-01-05
| 14290 | | | |
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