What a GPO actually does for an independent practice

What a GPO actually does for an independent practice

Most practice owners have heard of group purchasing organizations without ever getting a straight answer about what one does. The explanations tend to arrive wrapped in procurement language, and the useful part gets lost. So here is the plain version.

A group purchasing organization negotiates prices with suppliers on behalf of many buyers at once. You join, and you buy at a price that the collective volume already earned. Nothing about your ordering changes. You order from the same distributor, the boxes arrive the same way, the same person on your staff places the order. The price on the invoice changes.

That is the whole mechanism. Everything else is detail.

Why the price is different

A single practice buying gloves, sutures, and exam table paper is a small customer. A supplier has no particular reason to sharpen a pencil for a buyer that orders a few thousand dollars a month. Multiply that practice by several thousand and the supplier is now looking at real volume, and the math on a discount changes.

The savings are not only about volume, though. A meaningful share comes from work that does not have to be repeated. Negotiating a supply contract takes time, expertise, and usually a lawyer. A GPO does that work once, centrally, instead of every practice doing it separately. The Healthcare Supply Chain Association describes this as reducing transaction costs, and it is the reason a practice with no procurement staff can still buy on enterprise terms (HSCA).

What the savings actually look like

Be careful with savings claims in this industry. The honest answer is that it depends on what you buy and what you were paying before.

The most widely cited figure comes from an analysis by former Federal Trade Commission chairman Jon Leibowitz, which found that hospitals save 10 to 18 percent by buying through GPOs, measured against what they would have paid negotiating alone (HSCA).

A 2025 study in the Journal of Public Economics approached it from a different direction and looked at whether the scale of the GPO matters. It does. Moving from a GPO in the 25th percentile of scale to one in the 75th percentile reduced supply expenses per discharge by 4.8 percent, which worked out to roughly 85 dollars per discharge and more than 1.2 million dollars a year for an average hospital in the data (Journal of Public Economics).

Those are hospital figures, and a physician practice is a different animal with a different purchasing mix. The direction is the same. The magnitude for your practice depends on your categories.

What a GPO does not do

This is the part that gets glossed over, and it matters more than the savings numbers.

A GPO does not tell you what to buy. Every GPO contract is voluntary. You can buy off contract whenever you want, and providers do it routinely (HSCA).

A GPO does not replace your distributor. It does not warehouse anything or ship anything. It negotiates the terms under which you buy from the suppliers you already use.

A GPO does not lock you in. Joining a legitimate GPO costs nothing and carries no purchase minimum. If it is not delivering, you leave.

A GPO is not exclusive. A 2010 Government Accountability Office report found that hospitals belong to two to four GPOs on average (HSCA). Belonging to more than one is normal, not a conflict.

How a GPO gets paid, in plain terms

This confuses people, so it is worth being direct.

You do not pay the GPO. The suppliers do. When a member buys under a negotiated contract, the supplier pays the GPO an administrative fee calculated on that purchase. It is the same reason a travel agent could once book a flight without charging you.

The obvious question is whether that creates a conflict, and Congress asked it a long time ago. The answer was a set of rules rather than a ban. Federal law does not limit what a GPO may be paid. What it requires is that the arrangement be set out in a written agreement with the member, so the economics are visible rather than assumed (42 CFR 1001.952(j)).

Fee levels vary widely by category. A 2010 Government Accountability Office report found the vast majority of GPO administrative fees ranged from 1.22 to 2.25 percent (HSCA), reflecting general medical and surgical supply contracting. Categories involving heavier negotiation, clinical review, or narrower markets carry more.

Which means the useful question is not what the fee is in isolation. It is whether you can see it, and whether what you save exceeds what you were paying before.

Who this is worth it for

Practices that spend real money on supplies and have nobody whose job is to negotiate. That is most independent practices.

If you administer vaccines, run point of care testing, do procedures, or stock anything with a biologic in it, your supply line is large enough to matter and complicated enough that nobody in your office has time to shop it properly. That gap is what group purchasing closes.

Virtually all of the roughly 7,000 hospitals in the United States belong to at least one GPO, as do the vast majority of the 68,000 non acute care centers (HSCA). Hospitals figured this out decades ago. The reason independent practices lagged is not that the model works differently for them. It is that most GPOs were not built to reach them.

One Harbor Alliance contracts on behalf of ACOs, MSOs, CINs, FQHCs, and independent physician practices. Participation is voluntary at every level and joining costs nothing. If you want to know what your own categories would look like, start with a question.