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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 HETS EDI Enrollment (Attestation).

HETS EDI Enrollment is completed through a provider’s Medicare Administrative Contractor (MAC). As part of this process, providers confirm that Stedi is authorized to perform Medicare eligibility checks on their behalf.

To complete HETS EDI Enrollment:

• Providers must enroll with one MAC where they already have active electronic Medicare Fee-For-Service (FFS) claims enrollment.
• It is not required to enroll separately with each MAC where claims are submitted.
• The MAC will verify existing electronic claims enrollment before approving HETS access.

Once approved, the enrollment applies nationally.

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

This page provides:

• A MAC lookup to help identify the correct contractor
• Step-by-step attestation guides for each MAC
• Direct links to the appropriate MAC portals

MAC Lookup

1. Look up your NPI in the CMS Medicare enrollment dataset:

   👉 Medicare Fee-for-Service Public Provider Enrollment

2. Check your Provider Type Description and enrollment state.

   • If you are enrolled as a DME supplier, complete attestation through CEDI.
   • If you are enrolled as Home Health or Hospice, use the HH&H column in the lookup table and match your state.
   • All other providers (e.g., physicians, clinics, hospitals) should use the A/B column and match their state.

3. Follow the HETS EDI Enrollment (Attestation) instructions for the MAC listed.