Physician Sex and Patient Outcomes
Female physicians achieve lower mortality and readmission rates among hospitalized patients compared to male physicians, with the most pronounced benefit occurring when female patients are treated by female physicians. While these outcome differences are statistically significant and clinically meaningful for female patients, accommodating patient preferences for physician sex should be balanced against the practical realities of physician availability and the need to address underlying practice pattern differences rather than simply matching by sex.
Evidence on Mortality and Complications
The data consistently demonstrates measurable outcome differences based on physician sex. Among Medicare hospitalized patients, those treated by female physicians had:
- Lower 30-day mortality: 11.07% vs 11.49% (adjusted risk difference -0.43%) 1
- Lower readmission rates: 15.02% vs 15.57% (adjusted risk difference -0.55%) 1
- Number needed to treat: 233 patients to prevent one death, 182 to prevent one readmission 1
A 2025 meta-analysis of over 13 million patients confirmed these findings across both surgical and medical specialties, showing significantly lower mortality (OR 0.95; 95% CI: 0.93-0.97) among patients of female physicians 2. In surgical populations specifically, patients treated by female surgeons had lower rates of adverse outcomes at both 90 days (12.5% vs 13.9%) and 1 year (20.7% vs 25.0%), with notably lower mortality at both time points 3.
The Sex Concordance Effect
The benefit of female physicians is substantially larger for female patients than male patients. A 2024 analysis revealed:
- Female patients with female physicians: 8.15% mortality vs 8.38% with male physicians (AME -0.24 percentage points, clinically meaningful) 4
- Male patients with female physicians: 10.15% mortality vs 10.23% with male physicians (AME -0.08 percentage points, not clinically important) 4
The difference-in-differences was -0.16 percentage points, indicating female patients derive greater benefit from female physicians 4. This pattern extends to surgical care, where female patients treated by male surgeons had significantly worse outcomes (aOR 1.15; 95% CI 1.10-1.20) compared to female patients treated by female surgeons, while male patients showed no such disadvantage with female surgeons 5.
Important Caveats and Nuances
The absolute differences are small - the ACP guideline acknowledges these differences "may be statistically significant only because of the large sample size, and their clinical significance is unclear" 6. However, when scaled to population level (10 million Medicare hospitalizations annually), this translates to approximately 32,000 fewer deaths per year 6.
Attribution challenges exist - determining which specific physician is responsible for outcomes in team-based hospital care is inherently difficult 6. The studies attempted to address this by focusing on hospitalists and using hospital fixed effects to compare physicians within the same institution.
Not all contexts show concordance effects - A 2026 Austrian cardiac surgery study found no association between patient-surgeon sex pairing and postoperative outcomes, suggesting the concordance effect may not apply universally across all surgical subspecialties 7.
Underlying Mechanisms
The ACP guideline identifies several practice pattern differences that may explain these outcomes 6:
- Female physicians spend an average of 2 minutes longer per visit
- More patient-centered communication with greater psychosocial counseling
- Higher rates of preventive care delivery
- Greater adherence to clinical guidelines and evidence-based practice 1
- More empathetic communication styles
Practical Recommendations
Do not implement rigid physician-patient sex matching policies. Instead:
Focus on practice patterns, not sex: The goal should be identifying and disseminating the specific clinical behaviors associated with better outcomes (guideline adherence, communication styles, preventive care) that can be adopted by all physicians regardless of sex 6.
Accommodate reasonable preferences when feasible: If a patient expresses a preference for a physician of a particular sex, particularly female patients requesting female physicians, honor this when it doesn't compromise timely access to care or create operational barriers.
Prioritize clinical urgency: In emergent situations or when specialist availability is limited, physician competence and availability supersede sex-based preferences.
Address systemic barriers: The ACP emphasizes that the medical profession benefits from physician workforce diversity and calls for eliminating gender-based compensation disparities and career advancement barriers 6.
Common Pitfalls to Avoid
- Over-interpreting small absolute differences: While statistically significant, individual patient decisions should not be based solely on physician sex
- Assuming concordance matters equally across all specialties: Evidence is strongest for general internal medicine and some surgical fields, but not universal
- Ignoring the quality of individual physicians: Physician training, experience, and adherence to evidence-based practice matter more than sex alone
- Creating access barriers: Rigid matching policies could delay care or limit access to specialists
The evidence supports that female physicians, particularly when caring for female patients, achieve modestly better outcomes. However, the appropriate response is to study and disseminate the specific practice behaviors driving these differences rather than implementing sex-based physician assignment protocols 6.