When people hear “lean,” they often think of cost-cutting. In healthcare, the more accurate translation is removing the waiting, walking, and rework that sit between a clinician and the patient. Two US health systems - Virginia Mason Medical Center in Seattle and ThedaCare in Wisconsin - built their improvement programs directly on the Toyota Production System (TPS), and unlike most management fashions, they measured what happened.
Virginia Mason: a car factory’s operating system in a hospital
Virginia Mason began adopting the Toyota Production System in 2002, sending its leaders to study production lines in Japan and returning to build the “Virginia Mason Production System” (VMPS). Writing years later for the National Academy of Medicine, chairman and CEO Gary S. Kaplan, MD, laid out the cumulative results in plain numbers. VMPS, he wrote, had:
“Saved $11 million in planned capital investment […] freed an estimated 25,000 square feet of space […] Reduced inventory costs by $2 million […] Reduced nurse walking distance in the hospital by 750 miles per day, freeing up more than 250 hours […] Reduced the time it takes to report lab test results to the patient by more than 85 percent […] and Reduced premiums for professional liability insurance by 56 percent.”
Those are not soft metrics. Freeing 25,000 square feet of space meant a planned hyperbaric-medicine expansion no longer required a new building. Cutting 750 miles of daily nurse walking is time returned to patients.
That last point is the heart of it. When Virginia Mason redesigned its nursing work areas into compact “cells,” the daily steps walked by each nurse fell from roughly 10,000 to about 1,200, and the share of nursing time spent in direct patient care rose from 35 percent to more than 90 percent (Kaplan, NAM Perspectives, 2012).
Making it safe to stop the line
The most quietly radical import from Toyota was the andon cord - the idea that any worker can stop the production line when something looks wrong. Virginia Mason built its equivalent, the Patient Safety Alert (PSA) system, which requires any employee who encounters a situation likely to harm a patient to report it immediately and halt the activity.
The effect on reporting culture was dramatic. In a peer-reviewed evaluation, reports rose from an average of 3 per month in 2002 to 285 per month by 2006, with 6,112 alerts received by December 2006 - and, notably, they came from across the workforce (44% nurses, 23% non-clinical staff, 20% managers, 8% physicians). The authors concluded that the system had “drastically increased the number of safety concerns that are resolved at VMMC, while drastically reducing the time it takes to resolve them” (Furman & Caplan, Joint Commission Journal on Quality and Patient Safety, 2007).
ThedaCare: value streams and the door-to-balloon clock
ThedaCare, led at the time by CEO John Toussaint, MD, took the same tools to a different problem: the flow of patients through care. In On the Mend (Lean Enterprise Institute, 2010), Toussaint and Roger Gerard describe using value-stream mapping and rapid improvement events to attack delay directly. One widely cited result: average “door-to-balloon” time for heart-attack patients - the interval from arrival to opening a blocked artery, where minutes are muscle - was cut from 90 minutes to 37 minutes at two ThedaCare hospitals. Over roughly seven years, the organization credits its lean work with about $27 million in savings achieved without layoffs. (These figures come from On the Mend; treat them as the organization’s own reporting.)
Does the wider evidence hold up?
Two flagship case studies do not make a science. So it matters that a 2025 systematic review in the International Journal of Health Policy and Management pooled 60 studies (screened from 6,021) and found a consistent, if variable, pattern: twelve studies reported waiting-time reductions ranging from 11.3% to 88.0%, several reported shorter length of stay (one cut preoperative stay by 22.4%), and operating-cost savings ranged from 8.7% to 80% (Wang et al., 2025).
The same literature carries an honest caveat worth repeating: lean studies overwhelmingly report positive results and rarely measure staff burden or safety trade-offs systematically - a hint of publication bias. Lean is a powerful lens, not a magic wand.
The real lesson
What Virginia Mason and ThedaCare proved is not that a particular tool works, but that a hospital can treat its own processes as something to be studied, measured, and continuously improved - and that when it does, the waste it uncovers was real all along. The 750 miles of walking existed before anyone counted them. Lean’s contribution is making waste visible enough to remove.
Sources
- Gary S. Kaplan, “The Lean Approach to Health Care: Safety, Quality, and Cost,” National Academy of Medicine (NAM Perspectives), 2012. https://nam.edu/perspectives/the-lean-approach-to-health-care-safety-quality-and-cost/
- Furman C, Caplan R. “Applying the Toyota Production System: using a patient safety alert system to reduce error.” Joint Commission Journal on Quality and Patient Safety, 2007;33(7):376-86. https://pubmed.ncbi.nlm.nih.gov/17711139/
- Toussaint J, Gerard R. On the Mend: Revolutionizing Healthcare to Save Lives and Transform the Industry. Lean Enterprise Institute, 2010. https://www.lean.org/store/book/on-the-mend/
- Wang J, et al. “A Systematic Review of Lean Implementation in Hospitals: Impact on Efficiency, Quality, Cost, and Satisfaction.” International Journal of Health Policy and Management, 2025. https://pmc.ncbi.nlm.nih.gov/articles/PMC12573144/