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Deadline: CMS has indicated enforcement will begin May 11, 2026.

Impact: If you do not complete attestation, Medicare eligibility checks will stop working after enforcement begins.

Official CMS Announcement: HETS EDI: How to Enroll | CMS

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Overview

CMS requires an Eligibility Attestation for providers who use Stedi to check Medicare eligibility (270/271).

To Complete CMS EDI Enrollment (Attestation)

1. Make sure you already submit Medicare claims electronically with a Medicare contractor (MAC).
2. Find your MAC (steps below), then use the Go to your MAC guide below for the instructions to complete attestation.
3. Complete the attestation with one MAC where you submit claims electronically. You do not need to do it for every MAC.
4. You are done when your MAC approves the request.

• Before you start (required)

MAC Lookup

• If you already know your MAC, skip to Go to your MAC guide below.
• If you do not know your MAC, use the steps here.

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.
   • Everyone else should use the A/B column and match their state.

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

• MAC table (by state and provider type)

Go to your MAC guide

A/B Medicare, Home Health, and Hospice