Case Study 1 — Site-Neutral Payment: The Clinic Visit That Cost Two Different Amounts

A real, public case — the site-neutral payment fight over hospital outpatient clinic visits — told from the documented record: statute, notice-and-comment rulemaking, and published federal court decisions. No payment rate, percentage, or dollar figure is asserted here as current; the rates live in the annual OPPS/ASC final rule and change every January 1. Where the policy literature's findings are summarized, they are summarized qualitatively.

Background

Section 34.9 ended on a fact pattern the patient cannot see from the waiting room: the same procedure, by the same physician, carries different prices at different sites, and the price follows the building rather than the medicine. Chapter 26 §26.9 measured the effect on this book's own file — Account 10-4471's March 14 visit, unchanged in every clinical respect, converted from an independent office to a hospital outpatient department: the professional allowed amount falls, a facility claim appears, the total rises to 1.67 times the original and the patient's share to 1.78 times.

The mechanism is provider-based billing. Under CMS's provider-based rules, a department that is physically separate from the hospital's main campus can nonetheless be treated as part of the hospital — and therefore bill a facility claim under OPPS — if it satisfies a list of integration requirements covering ownership, clinical and financial integration, administration, and public awareness that the department is part of the hospital. A practice that is acquired and converted does not change what happens in the exam room. It changes how many claims the exam room generates and which payment system prices each one.

Through the 2010s, this became one of the most-examined patterns in Medicare payment policy. The Medicare Payment Advisory Commission (MedPAC) analyzed it across multiple report cycles and recommended aligning payment across settings for selected services, documenting that volumes of certain services were migrating from physician offices into hospital outpatient departments faster than any clinical explanation accounted for. The Office of Inspector General (OIG) has repeatedly examined provider-based status itself — whether departments billing as provider-based actually meet the requirements, and whether beneficiaries understood what they were being billed for. Neither body concluded that provider-based billing is improper. Both concluded that the payment differential was doing work nobody had designed it to do.

The issue

Congress moved first. Section 603 of the Bipartisan Budget Act of 2015, enacted November 2, 2015, drew a line through the middle of the problem — and drew it by date. Off-campus provider-based departments that were not already billing under OPPS as of the date of enactment became "non-excepted": their services would no longer be paid under OPPS at all, but under a different applicable payment system. Departments already billing under OPPS on that date were excepted — grandfathered. On-campus departments were untouched. Dedicated emergency departments were carved out entirely, on the reasoning that emergency capacity is exactly the standby cost the hospital rate exists to fund.

CMS implemented §603 in the CY 2017 OPPS rulemaking, designating the Medicare Physician Fee Schedule as the applicable payment system and paying non-excepted departments a defined fraction of the OPPS amount — a fraction set by rule and revised since. And the whole statute arrived at the coder's desk as two HCPCS Level II modifiers: PO, reporting an excepted service furnished at an off-campus outpatient provider-based department, and PN, reporting a non-excepted one. A national policy argument, compressed into two characters on a claim line.

Then CMS went further than the statute had. In the CY 2019 OPPS final rule, the agency extended a site-neutral payment amount to the clinic visit — G0463, the flat hospital outpatient clinic-visit code §34.8 introduced — furnished at excepted off-campus departments as well, phasing the reduction in over two years. The authority CMS invoked was not §603. It was a long-standing provision of the OPPS statute directing the Secretary to develop a method for controlling unnecessary increases in the volume of covered outpatient department services.

One design choice inside that decision is the one this chapter has been building toward. Section 34.2 established that OPPS is budget-neutral by law: when CMS moves money inside the system, the annual rule offsets the change so aggregate spending stays on its statutory path — every winner is funded by everyone else. Here CMS deliberately did not apply budget neutrality to the clinic-visit reduction. Its reasoning was internally coherent: a volume-control method whose savings are redistributed back inside OPPS has not controlled volume; it has moved money between hospitals. The savings therefore left the system. That choice was central both to the policy's purpose and to what happened next.

What happened

The American Hospital Association, the Association of American Medical Colleges, and member hospitals sued in the United States District Court for the District of Columbia.

In 2019, the district court ruled for the hospitals. The core of the holding: the volume-control provision does not authorize a service-specific rate reduction of this kind, and CMS had used it in a way that effectively undid the exception Congress had written into §603 — grandfathering departments in statute, then reaching them by rulemaking. The court set the policy aside.

In 2020, the D.C. Circuit reversed. The appellate court read the volume-control language broadly, concluded that the statutory text was capacious enough to encompass a rate adjustment aimed at a service whose volume growth CMS had identified, and upheld the policy. The Supreme Court declined to take the case.

The outcome

The reduction stands. Clinic visits furnished at excepted off-campus provider-based departments are paid at the site-neutral amount, and the grandfather clause Congress wrote in 2015 survived as text while shrinking in practice for the single highest-volume service it covered.

For a working coder, the operational residue is small and permanent: the site modifiers still ride on off-campus claims, G0463 is still the facility's clinic-visit code, the professional claim still carries place of service 19 or 22 (Chapter 25 §25.8), and which of those data elements is correct is a fact about the department's status — a fact the coder generally does not own and must be able to look up. For anyone reading OPPS rulemaking, the residue is larger: the agency's rate-setting authority under the volume-control provision is broad, and hospitals now know it.

What it shows

A payment differential is a policy, and it is renegotiated every year. The price gap between an office and a hospital outpatient department is not an accident and it is not, by itself, a scandal. It has a stated rationale — hospitals carry standby capacity, EMTALA obligations, and a sicker average patient — and it simultaneously creates an incentive to move sites of care and to acquire practices. Both are true. The site-neutral fight is an argument about how much, conducted in rulemaking and then in court, and it is still going.

Budget neutrality is a switch, not a law of nature. §34.2 taught the rule; this case shows the exception being chosen deliberately, defended in the preamble, and then argued about in litigation. When you meet an OPPS policy that seems to take money out of the system rather than move it around inside, look for the volume-control theory — that is usually what is being invoked.

The claim carries the policy. Everything above reaches a desk as a modifier, a place-of-service code, and a HCPCS code. A department's excepted status determines which modifier is correct; somebody has to know it, and it is nearly always somebody in operations rather than in coding. This is the same seam Chapter 26's Case Study 2 was built on: the people who know the corporate structure and the people who know the billing rule are usually different people, and the claim asserts the answer either way.

And the patient still cannot see any of it. Chapter 26 §26.9 said twice that its counterfactual was not an argument that provider-based billing is improper — it was an argument that the patient has no way to know. Site-neutral payment narrows the differential for one service, in one setting category, for one program. It does not tell the patient in advance which building she is standing in for billing purposes, and it does not relieve anybody of Chapter 32 §32.2's estimate obligation. The policy fight is upstream of her; the bill is not.

Discussion questions

1. The differential has a rationale (standby capacity, EMTALA, acuity) and an effect (a shopping and acquisition incentive). Both are true. Write the two-sentence version of each side that its strongest advocate would recognize as fair — then say what evidence would move you.

2. Congress grandfathered existing off-campus departments by date; CMS later reached one service in those same departments by rule, and an appellate court held it could. What does that sequence teach about the durability of a statutory exception in a program that is repriced annually — and what should a hospital planning a five-year capital project take from it?

3. CMS declined to apply budget neutrality to the clinic-visit reduction, reasoning that redistributing the savings inside OPPS would not control volume. Explain the reasoning in your own words, then state who bore the effect of that choice under each of the two scenarios: budget-neutral and not.

4. The entire policy arrives at a claim as modifier PO or PN, a place-of-service code, and G0463. Who in a health system actually knows whether a given department is excepted? Design the smallest control that keeps that fact accurate on every claim, and say what event should trigger a review of it.

5. Chapter 26 §26.9 measured the patient's share rising to 1.78 times on a converted practice, and this chapter's §34.9 measured a two-to-one facility-payment difference between a hospital department and an ambulatory surgery center for the same endoscopy. Neither figure is visible to the person paying it. Using Chapter 32 §32.2's estimate requirements, state what a patient would have to be told, and when, for the differential to become a choice rather than a surprise — and name the practical obstacle to telling her.