Why More Patients Are Choosing ASCs Over Hospital Outpatient Departments

If you needed a colonoscopy or cataract surgery ten years ago, you probably went to a hospital. That's just where procedures happened. But over the last decade, something shifted — quietly, without much fanfare — and a growing number of patients are now having those same procedures at freestanding ambulatory surgery centers instead. In 2023, ASCs performed over 60% of all Medicare outpatient surgical procedures. That's not a niche trend. That's a structural change in how elective surgery works in the United States.

So what's driving it? And should it change where you go for your next procedure?

The cost difference is real — and it flows to patients

The most concrete reason is money. Medicare pays ASCs significantly less than hospital outpatient departments for the same procedure — currently around 55–60% of the hospital rate. That gap isn't just an accounting footnote. It shows up in what patients actually pay.

For a standard colonoscopy, the difference in facility fees between an ASC and a hospital outpatient department can be $300–$700 out of pocket for a Medicare patient. For a cataract surgery, it can be several hundred dollars more. Over a lifetime of routine procedures, those differences add up. And for patients without supplemental coverage who owe 20% of the Medicare-approved amount, the savings from choosing an ASC can be immediate and significant.

Hospital systems are aware of this, and many have lobbied hard to narrow the payment gap or restrict which procedures can be performed at ASCs. That's worth knowing — the resistance to ASCs from hospital networks isn't driven by patient safety concerns.

ASCs are purpose-built for what they do

A hospital is designed to handle everything: trauma, critical illness, obstetrics, oncology, and elective surgery all happening simultaneously. That breadth is a strength when you need emergency care. It's a source of friction when you need a routine procedure.

ASCs do one thing: elective outpatient surgery. The staff do the same procedures every day. The OR schedule is built around efficiency, not around emergency interruptions. The equipment is calibrated to the specific procedures performed there. That focus tends to produce faster, more predictable experiences — and often better patient satisfaction scores.

CMS publishes OAS CAHPS patient experience data for thousands of ASCs. When you compare those scores to hospital outpatient departments, ASCs consistently perform better on measures like staff communication, cleanliness, and overall experience rating. That's not marketing — it's the data.

Safety outcomes are comparable for appropriate patients

The reasonable concern about ASCs is safety — specifically, the absence of a full hospital infrastructure nearby. It's a fair thing to consider. ASCs don't have ICUs. They're not equipped for major cardiac events or unanticipated surgical crises in the way a hospital OR is.

But for the procedures ASCs are designed to perform — elective, planned, lower-risk procedures on patients without severe comorbidities — the safety data is strong. Multiple large studies comparing ASC and hospital outpatient outcomes for the same procedures have found comparable complication rates, and in some analyses ASCs perform better. The focused environment and high procedural volume appear to offset the lack of hospital backup for routine cases.

The key phrase is 'appropriate patients.' If you have significant cardiac disease, severe COPD, or other conditions that meaningfully increase anesthesia risk, a hospital setting may genuinely be the right call. For most healthy adults having elective procedures, it probably isn't.

What this means for your next procedure

If your doctor recommends a procedure and schedules it at a hospital outpatient department, it's worth asking whether an ASC is an option. For most elective procedures, the answer will be yes. The follow-up question is which ASC — and that's where quality data matters.

Look at CAHPS scores, accreditation status, and Google reviews. Ask about the facility's volume for your specific procedure. Confirm that your surgeon and anesthesiologist are in-network. These questions take five minutes and can save you money, time, and a worse experience.

The shift to ASCs isn't about cutting corners. For millions of patients every year, it's about getting the same procedure in a better environment for less money. That's why it's happening.