When you benchmark, you improve. This principle captures the essence of value-based health care. A four-year study now puts numbers behind it. Published in NEJM Catalyst Innovations in Care Delivery, the research led by Katz et al. tested whether unmasked peer benchmarking using PROMs could encourage cataract surgeons to refine their surgical indications and deliver better outcomes. The study was built on the ICHOM standard set for cataract surgery, integrating PROMs, clinician-reported outcomes, and case-mix variables to enable risk-adjusted benchmarking across four institutions.
How it worked
Of 52 surgeons from four hospitals and private clinics in France, 24 agreed to participate in a peer benchmarking community from 2021 to 2025, covering over 2,600 complete patient cases. In the baseline phase, surgeons had no access to their own data or those of their peers. Once benchmarking began, each surgeon's identity and results became visible to the entire community. An online dashboard displayed health gain scores, captured through the validated Catquest-9SF questionnaire, with full peer benchmarking and case-mix adjustment. Quarterly peer video conferences offered a structured, non-punitive space for collective reflection and improvement.
What changed
Five times more surgeons revised their surgical indications during benchmarking than before (42% vs. 8%, P=0.021). Among those who did, average patient health gain scores rose by 22% and the proportion of patients without meaningful benefit dropped by 34%. Only surgeons who actively consulted the PromTime dashboard modified their indications. Those who did not engage reported no change in practice. The study also identified a clinically actionable threshold: patients with a pre-surgery PROM score above 85 had an 80% probability of not achieving meaningful visual improvement, whereas those with a score below 65 had a 91% probability of meaningful benefit.
Why it matters
Unmasked peer benchmarking fosters horizontal self-regulation, realigning caregivers around patient outcomes rather than volume metrics, and breaking down professional silos through structured peer dialogue. It transforms benchmarking from a solitary performance review into a collegial improvement cycle built on trust and accountability rather than coercion. For ICHOM, these results confirm that standardized outcome benchmarking is the foundation for continuous, peer-driven improvement — and a sustainable model for professional self- governance capable of aligning individual motivation and collective aspiration within a single value-based framework.
Katz G et al., NEJM Catalyst, Vol. 7 No. 5, May 2026. DOI: 10.1056/CAT.25.0467
