When CMS released the CY2026 Medicare Physician Fee Schedule final rule in November 2025, most of the coverage focused on the conversion factor increase. What got far less attention was a structural change that will reshape how coders approach documentation and code selection for years to come: the 2.5% efficiency adjustment to work relative value units (wRVUs) for non-time-based services.
The adjustment took effect January 1, 2026, applies to the vast majority of CPT procedure codes, and is structured to recur every three years. For coding teams, understanding this rule is not optional — it is the foundation of defensible reimbursement going forward.
What the Efficiency Adjustment Actually Does
Under the CY2026 MPFS Final Rule (CMS-1832-F), CMS reduced work RVUs — and the intraservice time embedded in those values — by 2.5% across most non-time-based services. The agency calculated the adjustment as the cumulative sum of the Medicare Economic Index productivity adjustment factor over the prior five years.
CMS’s stated rationale: clinicians become more efficient over time, and both intraservice time and work intensity decrease as providers gain expertise. CMS characterized time assumptions for many services as “very likely overinflated.” The practical result: if a CPT code had a wRVU of 2.00 before January 1, 2026, it now carries approximately 1.95. That flows directly into physician compensation models and into the RVU calculations that drive reimbursement.
Why Procedural Codes Took the Largest Hit
Non-time-based codes — the codes where a physician performs a defined procedure or service and the billing unit is the service itself, not the time spent — are the primary target of the adjustment. These include most surgical CPT codes, radiology procedures, cardiology catheterization codes, and diagnostic imaging interpretations.
For specialties like orthopedic surgery, interventional cardiology, and diagnostic radiology, the wRVU reduction is not offset by the simultaneous conversion factor increase. The American College of Surgeons noted in its January 2026 member bulletin that orthopedic surgery faces an estimated net payment reduction of approximately 1% under the combined effect of the CY2026 conversion factor adjustment and the efficiency-adjusted wRVU values — despite the headline that conversion factors went up.
Which Codes Are Exempt
Time-based codes are excluded from the efficiency adjustment. CMS specifically carved out evaluation and management (E/M) services, care management services, behavioral health and psychiatric services, services on the Medicare telehealth list, and maternity services with a global period designated as MMM. The logic: because these services are billed by time spent, CMS views the time documentation itself as the ongoing accuracy check, making a blanket efficiency assumption less appropriate.
What This Means Specialty by Specialty
The impact is sharply uneven across specialties. Practices whose revenue is driven by high-volume procedural CPT codes — orthopedic surgery, general surgery, radiology, gastroenterology, cardiology — will see wRVU totals contract without a corresponding reduction in the actual work performed. MGMA’s February 17, 2026 analysis of the rule identified practices most at risk as those using formulaic wRVU-based physician compensation models where a large share of work RVUs come from non-time-based procedural or imaging codes.
Conversely, specialties whose coding is already dominated by time-based services benefit from the exemption. Family medicine, internal medicine, psychiatry, and behavioral health practices will see their E/M-driven wRVU totals unaffected by the efficiency cut. In practices that have already shifted toward time-based E/M billing — documenting total visit time rather than relying solely on medical decision-making — the rule creates a structural advantage.
The E/M Documentation Shift — and Why It Changes Coding Strategy
The efficiency adjustment creates a direct financial incentive for providers to use time-based E/M billing when time is the more appropriate selection criterion. Under the current AMA E/M guidelines (effective January 1, 2021, and still in force for 2026), physicians can choose to report office visit E/M codes (99213–99215) based on either the complexity of medical decision-making (MDM) or the total time spent on the encounter on the date of service.
When Time Documentation Changes the Code Level
If a provider spends 40 minutes on an office visit that includes significant counseling or coordination of care, that time supports a 99215 under the time-based pathway (40+ minutes for established patients). The same encounter might support only a 99214 under MDM, depending on the complexity of problems and the data reviewed. Because E/M codes are time-based and exempt from the wRVU cut, accurately documenting and claiming the highest defensible code level under either pathway is increasingly important.
The coding implication is precise: coders should ask whether time documentation is present in the note and whether it changes the supported code level. If the physician documented total visit time and that time supports a higher-level code than MDM alone would support, the time-based selection should be considered. This is not upcoding — it is using the documentation that already exists to select the correct code.
Audit Risk Cuts Both Ways
The wRVU reduction for non-time-based codes does not reduce audit scrutiny on those codes. Documentation standards and medical necessity thresholds for surgical and procedural CPT codes are unchanged — a 2.5% wRVU reduction has no bearing on whether a code was appropriately reported. What changes is the incentive structure around code selection when there is a legitimate choice. For specialties with access to both time-based and non-time-based pathways — such as office-based surgical consultations or same-day procedures with a separately identifiable E/M — accurate time documentation is now more consequential than it was before 2026.
What Coding Teams Should Do Now
The efficiency adjustment is now six months old and will remain in effect through at least 2028 under the three-year recurrence schedule. Coding teams should take the following steps if they have not already done so:
- Audit for time-based E/M opportunities. Review a sample of office visit notes from procedural specialists. If total time is documented, verify it is being used to select the E/M level — not defaulted to a lower MDM-based code when time supports a higher one.
- Review same-day E/M and procedure coding. When a significant, separately identifiable E/M is performed on the same day as a procedure, ensure modifier -25 is applied correctly and the E/M documentation independently supports the code level billed.
- Train procedural specialists on time documentation. Surgeons and proceduralists accustomed to MDM-based E/M selection may not know they have a time-based alternative. A brief training on when and how to document encounter time is a compliance-safe revenue protection step.
- Update productivity benchmarks. Internal comparisons against MGMA or AMGA wRVU percentile data must use the 2026 wRVU values — not 2025. Prior-year benchmarks will overstate expected productivity for procedural specialties.
- Verify that coding software reflects 2026 wRVU values. Some encoder and charge-capture tools are slow to update fee schedule tables. Confirm your system pulls from the current CMS MPFS national payment amount database.
Where AI Fits In
Agentic AI coding platforms that operate from clinical notes can evaluate documentation and flag whether time is present, whether it supports a different code level than MDM alone would yield, and whether a modifier-25-eligible E/M is documented alongside a same-day procedure. The efficiency adjustment makes that analysis more financially consequential than it was a year ago. Coding teams deploying AI-assisted tools should verify that those platforms have incorporated the CY2026 MPFS updates — including the efficiency-adjusted wRVU values and the time-based code exemptions — before relying on AI-generated code suggestions for productivity or compensation calculations.
The CY2026 efficiency adjustment is ultimately a documentation accuracy story. The codes that escaped the wRVU cut are the codes where time is the billing unit. The codes that took the hit are the codes where the procedure is the unit. Knowing the difference — and ensuring documentation reflects the encounter accurately — is the coder’s direct contribution to a practice’s financial stability under the new rule. Medikode’s automated medical coding platform helps coding teams apply the current rule set consistently across every encounter, so documentation-driven opportunities are captured and coding patterns stay defensible as CMS’s reimbursement architecture continues to evolve.