Most important takeaways…
- The VHA study of 1.1 million ED visits found no mortality difference.
- NP care had 11 percent longer stays and 7 percent higher costs.
- Preventable hospitalizations rose 20 percent within 30 days for NP patients.
Emergency departments are a new front in the nurse practitioner scope of practice debate, and the stakes are measurable. A new American Economic Review study of 1.1 million VA ED visits used months-ahead scheduling to randomly assign patients to an NP or physician.
The findings are not one-sided. There was no statistically significant difference in 30-day mortality, but NP-treated patients had 11% longer ED stays, 20% more preventable hospitalizations within 30 days, and 7% higher overall costs.
That mixed scorecard reframes independence as a question of acuity, experience, and case matching, giving emergency NPs and professional organizations evidence to weigh diagnostic patterns, staffing models, and nurse practitioner advancement opportunities.
The Landmark Study: Design, Data, and Why It Matters
The landmark VHA study offers the most credible evidence yet on NP versus physician emergency outcomes because it removes patient choice from the equation.
A natural experiment inside the VA
The study, published in the American Economic Review, analyzed 1.1 million emergency department visits across the Veterans Health Administration.1 Since 2016, the VA has allowed NPs to practice independently in EDs, expanding nurse practitioner scope of practice in a real-world setting with both provider types working under similar conditions. Co-authors Dr. David Chan of UC Berkeley Haas and Yiqun Chen of the University of Illinois Chicago used VA scheduling as a natural experiment: provider schedules are set months in advance, but patients arrive unpredictably. That means patients did not select their provider based on severity, reputation, or preference. The VA setting also captures adult patients with a broad range of urgent and complex conditions, similar to many community emergency departments where acute care nurse practitioners work.
Why causality matters
Most observational comparisons of NPs and physicians struggle with patient sorting. Sicker or more complex patients may be triaged to physicians, while simpler cases go to NPs, or vice versa. In this study, the scheduling system breaks that link. When a patient arrives, the provider on shift becomes the treating clinician almost by chance. This produces a cleaner estimate of how outcomes differ based on who treats the patient, not who the patient chose. That design is why the findings carry more weight than earlier observational comparisons that cannot rule out patient mix differences. For NPs, this matters because the results reflect actual clinical performance under a design that approximates random assignment, not a pre-sorted patient population.
Case Complexity and Acuity: Where NP and Physician Outcomes Diverge
Emergency care is not one thing. A possible heart attack, a stroke alert, a trauma activation, and a suspected infection place very different demands on a clinician's speed, differential diagnosis, and use of imaging. Acuity and presenting complaint shape whether a visit hinges on rapid exclusion of life threats or on managing uncertainty, which is why broad averages can hide important nurse practitioner vs MD differences.
What the VHA data show when acuity is considered
The 2026 Veterans Health Administration study of 1.1 million emergency visits found no significant 30-day mortality difference between patients treated by nurse practitioners and physicians.1 Yet NP-treated patients had 11% longer emergency department stays and a 20% higher rate of preventable hospitalizations within 30 days.1 The performance gap narrowed for simpler cases, suggesting that the widest differences may concentrate in higher-acuity or diagnostically uncertain presentations. The public summary does not break these results out by specific complaints such as chest pain, stroke, trauma, or sepsis.1
Condition-specific NP vs physician evidence remains thin
Direct peer-reviewed comparisons for chest pain, stroke, trauma, and sepsis are limited as of 2026. A Japanese nationwide retrospective cohort of emergency departments with advanced practice nurses found no significant overall in-hospital mortality difference, but reported lower odds for some infectious and endocrine/nutritional/metabolic conditions.2 An inpatient cohort analysis showed a different pattern: lower hospital mortality and lower ICU transfer for NP groups, but longer length of stay and higher cost.3 These findings do not cleanly mirror the VHA emergency department averages, and they should be read cautiously because settings and patient mix differ.
NP Experience and Emergency Certification: Does It Close the Gap?
The question many emergency nurse practitioners are weighing is practical: if the VHA averages show a gap, does time in the department and specialty certification close it? The VHA analysis suggests the gap narrows for more experienced NPs, but the research does not settle on a clean years-in-practice cutoff.
What the Data Does and Does Not Show
One review supports safe, timely, efficient, and patient-centered NP care in emergency settings, and a 2026 update finds the strongest evidence for improvements in wait times and satisfaction.1 However, evidence that ENP or CEN certification directly causes better patient outcomes is limited and uneven. Much of the literature treats ED experience as valuable without establishing a universal minimum number of years that predicts better outcomes.
Certification Requirements Are Clearer Than Outcome Proof
Professional standards are more specific about competencies than validated thresholds. The typical ENP pathway spans 7 to 10 years from nursing entry to certified ENP, and many programs prefer or require 1 to 2 years of full-time ED nursing.2 One certification route requires 500 clinical hours, with 250 hours in emergency care. Recertification runs every 5 years and includes 75 continuing education hours, 25 of them specialty focused, plus 1,000 clinical practice hours.2
ANCC first offered ENP-BC by portfolio in 2013, and AANPCB launched the ENP-C exam in 2017.3 AAENP standards require at least master's level preparation or post-master's/doctoral specialty preparation, with competency demonstrated through standardized guidelines, continuing education, quality improvement, peer review, and specialty certification.4 In short, experience and certification appear to narrow the gap, but the strongest evidence is for process measures and patient experience, not for a guaranteed outcome advantage.
Once you control for acuity and experience, the meaningful question is not nurse practitioner versus physician, but which clinician has seen this presentation enough times to manage it confidently and safely.
What the Study Means for NP Scope of Practice Debates
Nurse practitioner scope of practice debates often get reduced to a yes/no question: can NPs work in the emergency department without a physician? The VHA study pushes past that framing. If performance varies more within each profession than between them, the policy question is not whether independent NP practice is always safe, but which patients, settings, and oversight structures produce the best outcomes, and how to match patients to providers.
State Law Does Not Separate ED Practice
As of 2026, no state maintains a distinct set of NP scope-of-practice rules for emergency departments; states apply the same full, reduced, or restricted framework used in all settings.1 Alaska, Arizona, New York, and Utah are among roughly 27 to 30 states plus DC with full practice authority.12 Alabama and Illinois fall in reduced practice, requiring a collaborative agreement for at least one element such as diagnosis or prescribing.1 California and Texas remain restricted.1 Even in full-practice states, hospital bylaws may add backup or review expectations, so state law is not the final word.
Access vs. Quality Monitoring
Translating the study to policy means weighing access against monitoring. Rural and underserved EDs may have no physician on site, and rigid supervision can leave gaps. Yet the study found patients treated by NPs had 11% longer stays and a 20% increase in preventable hospitalizations. That argues for structured case review, diagnostic support, and experience thresholds rather than a blanket ban on NP emergency care.
2025-2026 Changes Cut Both Ways
Wisconsin will move to independent practice for qualified APRNs on September 1, 2026.2 South Carolina has a pending bill, HB 3580, that would grant full practice after 2,000 hours, but passage is not confirmed.3 These reforms do not single out emergency settings; they shift the general framework, leaving ED deployment to employers and credentialing committees.
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NP vs Emergency Physician Pay and Cost-Effectiveness Models
The most recent BLS occupational wage estimates for 2025 list a median annual wage of $132,300 for nurse practitioners and $335,550 for emergency medicine physicians. Those broad occupational medians are not a direct stand-in for emergency department shift pay or RVU-based physician compensation. On cost-effectiveness, a 2024 Veterans Health Administration study of independent NP practice found that shifting 25% of ED visits to NPs raised total health care spending per case by 15% (about $238), excluding NP salaries, with a 7% ($66) increase in ED cost per visit, an 11% longer stay, and a 20% increase in 30-day preventable hospitalizations. Lower NP wages were outweighed by those nonwage resource costs in the ED model. The analysis stops at 30 days and is not a formal cost-effectiveness model, so downstream utilization beyond 30 days remains unpublished. In primary care, by contrast, some studies report NP care costs 6% to 7% less per year.
| Occupation | Total employment | Mean annual wage | 25th percentile | Median annual wage | 75th percentile |
|---|---|---|---|---|---|
| Nurse practitioners | 323,040 | $137,300 | $117,990 | $132,300 | $156,700 |
| Emergency medicine physicians | 32,880 | $317,480 | $184,830 | $335,550 | $418,890 |
