Acceptable Attachment File Extensions for Risk Adjustment Inquiries

As a reminder, CMS is sending this notification to inform Medicare Advantage Organizations (MAOs) that the Risk Adjustment Operations ( and the Risk Adjustment Policy ( mailboxes accept only certain formats for attached files. All attachments should be sent in one of the following formats: bmp, csv, docx, eml, jpg, msg, pdf, png, pptx, rtf, txt, xlsx and zip.

In the event you have questions, please contact CSSC Operations at 1-877-534-2772 (option 2) or by email at

Last Updated: 04/20/2023