He started with kidneys, one patient at a time. He ended up reshaping how an entire state pays for kidney care.
Balboa Nephrology answers its phones at a number that has not changed in years: (858) 810-8000. Behind that single line sits roughly 60 board-certified nephrologists, 19 clinical offices, and somewhere near 88 dialysis clinics threaded across San Diego, Orange County, and the Imperial Valley. More than 28,000 patients pass through its clinics. Several thousand more move through its dialysis and transplant programs.
Steve Steinberg is the CEO and Medical Director sitting at the center of that machine. His job title reads like two jobs because it is. One half is medicine - kidneys, dialysis, the long arithmetic of chronic disease. The other half is the business of keeping a 50-year-old practice both independent and solvent in an era when most of American medicine has been swallowed by hospital systems and private equity.
What he is working on now is a wager: that better kidney outcomes and lower costs are not opposites. Balboa has leaned hard into value-based care, the model where a practice gets paid for keeping patients healthy rather than for the volume of procedures it bills. The group now posts some of the strongest results in the country inside Medicare's CMMI and CMS programs. That is not marketing. It is a scoreboard, and Balboa keeps landing near the top of it.
Balboa Nephrology, founded 1973. Bars scaled for illustration.
The most important thing a doctor can do is encourage their patient that they are not alone.— Steve Steinberg, on the practice of nephrology
Steinberg trained the long way. He earned his MD at New York Medical College and built his clinical foundation in internal medicine before specializing in nephrology - the branch of medicine that lives with the kidney's quiet, relentless decline. Kidney disease rarely announces itself. It creeps. A nephrologist's work is measured less in dramatic saves than in years bought back, dialysis chairs avoided, transplants made possible.
By 1990 he was running kidney-pancreas transplantation at Sharp HealthCare, one of San Diego's major systems. Transplantation became his north star. He has said plainly that the best treatment for kidney failure is transplantation, not a lifetime tethered to a dialysis machine. It is a stance with consequences: it pushes a practice to think about prevention, donor matching, and the unglamorous logistics that get a patient to a new organ.
Then came the second act, the one most physicians never attempt. Steinberg helped turn a small practice - the kind that began in 1973 with two doctors - into Balboa Nephrology Medical Group, the largest nephrology group in California. He served as its CEO from 1998 to 2018, the stretch when the group did most of its growing. Building a practice that large while keeping it physician-owned is its own kind of medicine. It requires someone willing to sit in the boardroom and the exam room on the same day.
The growth was not acquisition for its own sake. Balboa has collected the markers that matter to the people who track quality: the Renal Physicians Association's Exemplary Practice Award, top-performer status in Medicare's CEC/ESCO experiments. The thesis - that scale and quality can coexist in independent nephrology - keeps holding up.
Value-based care flips the incentive. Balboa gets rewarded for keeping kidney patients out of crisis - slowing chronic disease, expanding home dialysis, moving people toward transplant. The scoreboard is national, and Balboa keeps placing near the top.
Steinberg's conviction that transplantation beats a lifetime of dialysis shapes the whole pipeline - earlier intervention, donor logistics, and a transplant institute built to get patients to a new organ faster.
While much of medicine consolidated under hospitals, Balboa stayed physician-led and grew anyway. Recent moves - a venture with Evergreen, a stake in Champion Health Plans - are bets on keeping that independence funded.
The practice he helped scale began in 1973 with exactly two physicians. Today it is the largest nephrology group in the state.
Balboa's reach now spans roughly 88 dialysis clinics and 19 offices across three Southern California counties.
His title is a deliberate hybrid - CEO and Medical Director - because he never stopped being both a clinician and a builder.
Build resiliency against all of life's changes and challenges.— Steinberg, on what care should leave a patient with
There is a version of the kidney-care story where bigger means colder - more locations, more billing, less of the person in the chair. Steinberg's career is an argument against that version. Balboa grew, and the patient-centered language stayed: respect, accountability, innovation, data. Words are cheap; Balboa keeps backing them with outcomes that hold up against the rest of the country.
His recent moves point forward, not back. In 2021 Balboa joined Evergreen Nephrology, the kidney-care company launched by Rubicon Founders, in a value-based joint venture. In early 2026 it took a strategic stake in Champion Health Plans to push integrated, condition-focused Medicare coverage for kidney patients. Each step is the same idea wearing new clothes - line up the money with the medicine, and the patient does better.
Fifty years in, Steinberg is still circling the same problem from new angles. The kidney does not get easier. The system around it does not get simpler. But the through-line is steady: get patients to transplant when you can, slow the disease when you cannot, and never let anyone face it feeling alone. That last part is not a slogan. For Steinberg, it has always been the point.
"The best treatment for kidney failure is transplantation."
A clinical philosophy that reshaped a practice - pushing Balboa toward prevention, donor logistics, and getting patients to a new organ instead of a lifetime on dialysis.