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Note: CMS has not started enforcing the HETS attestation requirement yet. CMS has indicated enforcement will begin May 11, 2026.

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Overview

CMS requires providers who submit Medicare eligibility checks (270/271 transactions) to complete CMS Eligibility Attestation (also referred to by CMS as HETS EDI Enrollment).

This attestation is completed through a provider’s Medicare Administrative Contractor (MAC). As part of this process, providers authorize Stedi to perform Medicare eligibility checks on their behalf.

Important

Providers must have an active electronic Medicare Fee-For-Service (FFS) claims (837) EDI enrollment on file with a MAC before completing CMS eligibility attestation.

The MAC will verify existing electronic claims enrollment before approving eligibility access.

If you do not currently submit Medicare claims electronically, you must first complete electronic claims (837) enrollment with your MAC.

You can identify your MAC here:

👉 https://www.cms.gov/medicare/coding-billing/medicare-administrative-contractors-macs/who-are-macs

Once you locate your MAC, look for their EDI Enrollment or Claims Enrollment section.

To Complete CMS Eligibility Attestation

• Complete attestation with one MAC where you already have active electronic Medicare FFS claims enrollment.
• It is not required to complete attestation separately with each MAC where claims are submitted.
• Once approved, the authorization applies nationally.

CMS will begin enforcing this requirement, and providers who do not complete attestation may experience interruptions in Medicare eligibility access after enforcement begins.