What CAHPS Scores Actually Tell You About an ASC

Every year, CMS collects patient experience surveys from people who had procedures at ambulatory surgery centers across the country and publishes the results publicly. These are called OAS CAHPS scores — Outpatient and Ambulatory Surgery Consumer Assessment of Healthcare Providers and Systems. They're available for thousands of facilities. And most patients never look at them.

That's a missed opportunity. Used correctly, CAHPS scores are one of the most useful tools available for comparing surgery centers before you choose one.

What the survey actually measures

CAHPS is a patient experience survey, not a clinical outcomes measure. It doesn't tell you whether complication rates are low or whether the surgeons are technically excellent. What it measures is how patients experienced the care they received — and that turns out to be surprisingly informative.

The survey asks patients to rate things like: Did staff explain what to expect during your procedure and recovery? Were you treated with courtesy and respect? How would you rate the cleanliness of the facility? How well was your pain managed? And an overall 0–10 rating.

These aren't soft questions. A facility where patients consistently say they weren't told what to expect has a real communication problem. A facility with low cleanliness scores has either a genuine infection control issue or the appearance of one — both matter. A pattern of low scores across multiple measures reflects something systematic about how that facility operates.

How to read the numbers

CMS reports CAHPS results as 'top box' scores — the percentage of patients who gave the most favorable response. For rating questions, that's a 9 or 10 out of 10. For frequency questions, that's 'Always.' A top-box score of 85% on overall rating means 85% of surveyed patients gave the facility a 9 or 10.

For most measures, high-performing ASCs cluster in the 75–90% range. A score of 90%+ across multiple measures is genuinely strong. A score below 60% on any measure warrants questions. When you see a facility with multiple measures below 70%, that's a pattern worth taking seriously.

One important caveat: small facilities may not have enough survey responses for CMS to publish scores. A missing score doesn't mean a facility is bad — it may just mean they don't have the volume to generate statistically reliable data. Look for the sample size when it's available.

What CAHPS scores cannot tell you

CAHPS measures patient experience — it doesn't measure technical surgical quality, complication rates, or infection rates. A facility can have excellent CAHPS scores and a surgeon with poor technical skills. It can also have mediocre CAHPS scores and outstanding clinical outcomes.

Use CAHPS as one signal among several. Combine it with accreditation status, Google reviews (which capture patient experience in a less structured way), the surgeon's personal volume and experience, and your own conversation with the facility. No single data point tells the full story — but CAHPS is a real data point that most patients ignore, which means it's an edge if you use it.