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You may have recently received information from the Centers for Medicare & Medicaid Services (CMS) about the Medicare Health Outcomes Survey (HOS) or Medicare Health Outcomes Survey-Modified (HOS-M). If you received the HOS or HOS-M questionnaire in the mail, we hope you’ll complete and return it. If you are not able to return the questionnaire, one of the survey organizations working with CMS may contact you by telephone. In 2025, four survey organizations are working with CMS on the survey: CSS, DataStat, Press Ganey, and Qualtrics.

Your voice matters.

Your responses will be used to help CMS improve the quality of health plans and help others choose a health plan. The survey takes just a few minutes to complete, and your information is kept private by Law. Participation is voluntary.

Your privacy is very important to CMS.

All information you provide will be held in strict confidence and is protected by the Privacy Act. Your information will be used only for the purposes permitted by law and it will not be disclosed or released for any other reason. We will not share your name, contact information, or your responses with any medical providers or salespeople.

We have prepared a short booklet of information about the survey and how it is used. The booklet is available for download here.

What to do if you have questions or concerns about filling out the survey.

Please contact CMS by telephone at 1-800-MEDICARE (1-800-633-4227) or by email at HOS@cms.hhs.gov. 

You can also use the information below to connect with the Customer Support line of the survey organization contacting you. To identify your survey organization, refer to the mailing address printed on the last page of the questionnaire you received and match it with the “Survey Processing Address” below.

Organization: CSS (https://www.cssresearch.org/)
Survey Processing Address: PO Box 3416, Hopkins, MN 55343-9747
Customer Support: hos@cssresearch.org or 1-888-785-8785

Organization: DataStat (https://www.datastat.com/)
Survey Processing Address: 3975 Research Park Drive, Ann Arbor, MI 48108
Customer Support: HOShelp@datastat.com or 1-877-455-9241

Organization: Press Ganey (https://www.pressganey.com/)
Survey Processing Address: PO Box 7315, South Bend, IN 46699
Customer Support: hos@pressganey.com or 1-800-872-0696

Organization: Qualtrics (http://www.qualtrics.com/)
Survey Processing Address: 5610 Rowland Suite, 160 Minnetonka, MN 55343
Customer Support: hoshealth@qualtrics.com 1-877-865-6459 

The National Committee for Quality Assurance (NCQA) oversees HOS and HOS-M data collection. You may also contact the NCQA team by email at hos@ncqa.org with questions or concerns about HOS and HOS-M survey organizations or questionnaires.

Examples of the Medicare HOS mailing materials are available below. Materials are also available in Spanish, Chinese, and Russian by request from HOS@cms.hhs.gov.

• View an example of the pre-notification and cover letters for the 2025 baseline and the 2025 HOS follow up surveys here.

Examples of the Medicare HOS-M mailing materials are linked below. Materials are also available in Spanish, Chinese, and Russian by request from HOS@cms.hhs.gov.

• View an example of the prenotification, cover letter, and reminder postcard for the 2025 HOS-M survey here.

Thank you for your interest in the Medicare Health Outcomes Survey and Medicare Health Outcomes Survey-Modified.

Remember, your voice matters. CMS looks forward to hearing from you.

This page was last modified on 06/18/2025