What happens when surgery stops subsidizing the hospital?

The subsidy is the thermometer. The fever is the case leaving the building.

When I started my training, a healthy forty-year-old woman having her gallbladder removed was a regular feature of the hospital operating room. She was admitted, she had her operation, and she spent a night or two on a surgical floor while we watched her recover. That case does not exist inside the hospital anymore. The operation is done through a few small ports, often now laparoscopically or robotically, and she is home before dinner — partly because the surgery itself got better, and partly because everyone involved is paid in ways that reward doing it someplace less expensive. By nearly every measure that matters to the patient, that is progress.

That case is also the migration in miniature. For most of my career, the smartest people in healthcare have been working to move care out of the hospital. We pushed procedures into ambulatory surgery centers, visits into outpatient offices, and recovery into the home, and for patients the results have largely been good. Care got cheaper, access got easier, and the setting around a routine procedure grew simpler and less frightening. I have argued for that migration myself, in strategy rooms where the math was plain and the benefit to patients was real.

What we discussed far less, because it was harder to see, is what that migration does to the building we are emptying.

A hospital loses money on most of what a community needs it to do. The emergency department, the behavioral health unit, charity and uncompensated care, obstetrics in a rural county, the residency program that trains the next generation: few of these cover their own costs, and several were never built to. For a generation, the operating room has quietly paid for them. Surgical and procedural services have been the hospital’s engine, generating the margin that funds nearly everything the institution loses money on, and most of the people who work on the surgical floor have little reason to watch the gauges. By one industry estimate, surgical and procedural services generate roughly sixty percent of a hospital’s operating margin. That is the engine I mean.

The engine is losing power at the same moment the organization is leaning on it harder. That is the whole of the problem, and it is worth saying plainly before anyone mistakes the symptom for the disease.

It is fair to note, before the finance reader does, that surgery is not the only quiet engine. In many non-profit systems the 340B drug-pricing program has grown into an offset of real consequence, and that room deserves its own walk-through another week. But the lever is available only to some hospitals, and it is under mounting pressure of its own, so leaning on it buys time rather than a trajectory.

Let me be clear about where I stand, because it shapes how you should read the rest of this. I lead an anesthesia company, and my group is not standing outside this problem pointing at it. We are inside it, losing to the same force the hospital is losing to. When the simpler cases leave for the surgery center, the hospital loses the margin that paid for its emergency department, and my clinicians are left with the harder cases, the longer nights, and a workforce that was already too thin. The subsidy a hospital pays an anesthesia group is the number everyone fixes on, and it is the symptom rather than the disease. I am not writing to argue that anyone should pay anesthesia more. I am writing because the case leaving the building is the event that matters.

Four forces are compressing the surgical margin at once, and each of them is a reasonable response to how someone is paid.

The first is the migration itself. High-margin elective surgery keeps moving to freestanding ambulatory centers because commercial payers prefer the lower-cost setting and because refined laparoscopic and robotic technique keeps expanding what can safely be done there, and Medicare’s push toward site-neutral payment, alongside the steady expansion of what it will pay for in an ambulatory center, is eroding the premium hospitals once earned for doing the same procedure under their own roof. The hospital’s advantage is narrowing by design.

The second is what stays behind. As the straightforward, well-insured cases follow the market out the door, the hospital operating room keeps an older, sicker, more Medicare-weighted population. Researchers studying hospitals that lost volume to ambulatory centers found a five percent rise in case-mix index and a ten percent rise in average length of stay between 2019 and 2023. The cases that remain cost more to perform and pay the institution less.

The third is the cost of the people who make surgery possible. More than eighty-five percent of hospitals now write a check to subsidize their anesthesia groups, and even ambulatory centers have begun to: the share expecting to pay an anesthesia stipend climbed from twenty-eight percent in 2024 to forty-four percent in 2025. This is a story about arithmetic rather than appetite. Medicare’s anesthesia payment fell from $22.27 a unit in 2019 to $20.43 in 2024 while clinician compensation rose by double digits, and national benchmarks now put median anesthesia compensation per unit slightly above median collections per unit. The subsidy exists because the work, paid at today’s rates, has stopped covering its own cost. That is the symptom in its clearest form.

The fourth is demand for that same scarce workforce in more places at once. Anesthesia is increasingly required outside the operating room, in cardiac catheterization labs, endoscopy suites, and interventional radiology, where structural heart procedures and advanced endoscopy have multiplied. By claims-based analyses, anesthesia delivered outside the operating room rose from about twenty-eight percent of all cases in 2010 to forty-three percent in 2023, with more than half projected within the decade. The same shortage that strains operating-room coverage now strains coverage everywhere else the hospital hopes to grow.

Put those forces together and you get a financial story that finance alone fails to capture. The part the margin tables miss is what the migration does to the hospital as a place to work.

When the easy cases leave, they take with them the rhythm that made the schedule survivable. The quick, predictable, daytime procedure that let a team breathe between hard ones is now done across town at a center that closes at five and carries no call. What remains inside the hospital is the heavy, complex, after-hours work, concentrated. The surgery center runs no emergency board at two in the morning, and the outpatient office is dark on the weekend, so the nights and the genuinely sick belong, more than ever, to the people who staff the hospital. The same pressure reaches well past anesthesia: the hospitalist, the intensivist, the palliative physician, and the bedside nurse inherit that concentrated acuity too, tending an inpatient census that has grown sicker on average because the well and the straightforward are now cared for somewhere else. For hospital-based anesthesia, the call burden and the unsocial hours have always been the hardest part of the job, and the migration deepens precisely that burden while a retiring workforce thins the bench that carries it. Roughly fifty-seven percent of practicing anesthesiologists are over fifty-five, and the training pipeline is capped by design rather than by interest: in the 2025 match, more than three thousand applicants competed for fewer than nineteen hundred anesthesiology residency positions. The hospital is asking a shrinking group to absorb a harder schedule, and that is a recruiting and retention problem long before it becomes a budget line.

It would be easier to write this if there were a villain, but there is not one. The commercial payer steering a knee replacement to an ambulatory center is lowering the cost of care, which is what we asked it to do. The health system cannot block the migration without forfeiting the cases entirely. The ambulatory operator captures the margin without inheriting the obligation to keep an emergency department open at three in the morning, which is architecture rather than character. Everyone is behaving rationally inside the incentives they were handed, and the sum of all that rational behavior is a hospital slowly losing the means to fund the services a community cannot do without.

This is why the fight over the subsidy is the wrong fight, or at least the small one. The subsidy is the thermometer. It rises because the case that used to run a margin now runs a loss, and arguing over the number treats the measurement rather than the fever. The disease is the departure of the case and the hollowing of the room it leaves behind. A hospital that negotiates its anesthesia subsidy down by a few points and calls the problem solved has cooled the thermometer and left the trajectory untouched. The question worth the energy in the room is the larger one: what replaces what the surgical margin has been quietly funding, and how does the institution keep its inpatient work survivable enough that people will still choose to do it?

I do not have a tidy answer, and I would be wary of anyone who offered one, because the forces involved are structural and they are converging by design rather than by accident. What I would ask of the leaders who sit where I sit is narrower, and I think harder. See the trajectory early, while there is still room to act, rather than waiting for the subsidy line to force the conversation. Acting early looks unglamorous and specific: re-engineering the inpatient schedule so the complex work that remains is survivable to staff, building coverage for the procedures that have moved outside the operating room deliberately rather than reactively, and pricing the subsidy conversation against the true cost of keeping the doors open rather than against last year’s number. Name it honestly to the board, including the part that implicates our own comfortable assumptions about growth. And stop spending the institution’s scarce attention on the thermometer when the fever is the thing that will take the building down.

We were right to move care closer to the patient. The migration made care cheaper and kinder, and I would argue for it again tomorrow. We were wrong to assume the engine room could keep funding everything else while we emptied it of the work that kept it running. The hospital that comes through this decade will be the one whose leaders saw, early enough to matter, that the case leaving the building was never only a billing event. The finance teams could watch the margin fall for years. What the people in the room and at the bedside could see, and say first, was what it was doing to the work itself.