Welcome to the Outpatient and Ambulatory Surgery CAHPS (OAS CAHPS) website

OAS CAHPS Survey is designed to measure patients’ experiences with care received from Medicare-certified hospital outpatient departments (HOPDs) and ambulatory surgery centers (ASCs). Information about the following topics is available under the General Information menu:

  • About OAS CAHPS. This section provides an overview and background information on the survey development.
  • National Implementation. This section provides an overview of the voluntary national implementation program which began January 2016.
  • Mode Experiment. This section provides a summary of the 2015 and 2019 Mode Experiments for OAS CAHPS.
  • Registration and Application Process. This section outlines the steps required for participating hospitals and ASCs to register for OAS CAHPS and for survey vendors to apply for approved vendor status.

For more information, please contact or call 1-866-590-7468.

For information about the availability of auxiliary aids and services, please visit:

Para información sobre esta encuesta o para hablar con alguien en español, por favor, comuníquese con el personal de coordinación de encuestas de OAS CAHPS por correo electrónico a la dirección o puede llamar al número gratuito 1-866-590-7468.