CMS launches online complaint form for providers to report Medicare Advantage issues

The Centers for Medicare & Medicaid Services implemented a new online process allowing health care providers to submit complaints about Medicare Advantage plans directly to the agency.

Beginning Dec. 22, 2025, CMS made an online provider complaint form available on CMS.gov.  Complaints submitted through the form will be routed to the Health Plan Management System Complaints Tracking Module, according to a CMS memo distributed to all Medicare Advantage organizations.

To access the form, providers will navigate to CMS.gov, select “Medicare” from the main menu, choose “Health & drug plans,” and then select “Report a provider complaint about an MA plan.” The form will collect basic information about the complainant, beneficiary, provider, and Medicare Advantage plan, along with a summary of the complaint. Optional fields will allow providers to include dates of service and claim numbers.

CMS stated that because complaints will now be submitted through an online form, Medicare Advantage plans will no longer receive attachments of the original provider complaint form. Submitted complaints will enter a queue within the Complaints Tracking Module, where CMS staff will review and triage them before assigning a contract number.

The update represents a formalized mechanism for providers to raise concerns directly with CMS regarding Medicare Advantage plans, including issues related to claims, denials, or plan administration.

The change comes amid continued scrutiny of Medicare Advantage supplemental benefits, including dental coverage. A recent cross-sectional study analyzing data from 2017 to 2021 found that while most Medicare Advantage plans offer dental, vision and hearing benefits, beneficiaries did not receive more supplemental services than those enrolled in traditional Medicare. The study also found that many Medicare Advantage beneficiaries claimed that cost-sharing remained a barrier to utilization.