Outpatient and Ambulatory Surgery CAHPS®

Outpatient and Ambulatory Surgery Consumer Assessment of Healthcare Providers and Systems (OAS CAHPS®)

The Centers for Medicare & Medicaid Services (CMS) has partnered with the Agency for Healthcare Research and Quality (AHRQ), another agency in the Department of Health and Human Services, to develop OAS CAHPS, the Outpatient and Ambulatory Surgery Consumer Assessment of Healthcare Providers and Systems Survey.


The OAS CAHPS initiative was developed as a patient-experience-of-care survey for patients who had surgery or a procedure at a hospital outpatient department (HOPD) or an ambulatory surgery center (ASC). Prior to OAS CAHPS, there was no standardized survey instrument to assess patient experience with outpatient surgical care received at HOPDs and ASCs.

What it is

The survey measures patients’ experiences on topics that are important when choosing an outpatient/ambulatory surgery facility for their surgery or procedure. The following types of patient experiences are included:

  • communication and care provided by health care providers and facility staff
  • preparation for the surgery or procedure
  • preparations for discharge and recovery


Participation in OAS CAHPS is voluntary.

CMS-approved survey vendors will administer the survey on behalf of HOPDs and ASCs via paper or telephone. Approved survey vendors will submit the data via the OAS CAHPS website, using the XML file specifications indicated on the website. CMS’ contractor for OAS CAHPS oversight, RTI International, will analyze the data; the results will subsequently be publicly reported on a CMS website.

More information

For more information about the OAS CAHPS initiative, including the XML file layout and the data upload specifications, see the OAS CAHPS Survey website.

CAHPS® is a registered trademark of the Agency for Healthcare Research and Quality, a U.S. Government agency.

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