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CMS HETS Attestation: Submission Guide

The Centers for Medicare & Medicaid Services (CMS) requires healthcare providers (HCPs) to attest to their relationships with medical benefit eligibility vendors who access the HIPAA Eligibility Transaction System (HETS).

This attestation helps prevent unauthorized access to the Medicare HETS, ensuring that patients’ health information (PHI) remains secure and compliant.

What You Need to Do

All HCPs with an individual NPI must complete the HETS attestation for both of AssistRx’s eligibility vendors — Experian and Availity — by Spring 2026.

Failure to complete this process by the deadline could result in:

  • Delays in AssistRx enrollment services and other support for your Medicare patients.
  • Possible interruptions in therapy access for your Medicare patients. 

When you enroll, you’ll need:

  • The name of the person authorized to sign on your organization’s behalf
  • Your email address (and optional alternate email address)
  • Your Provider Transaction Access Number (PTAN)
  • Your NPI
  • Effective date of your relationship with your vendor or clearinghouse
  • Termination date (if any) of your relationship with your vendor or clearinghouse

How to Complete the Attestation

Find your Medicare Administrative Contractor (MAC) region:

  1. View the regional map below, and click on your region to see the applicable links. Each link will open in a new tab.
  2. Note: Your MAC may have several links covering different Medicare services (Part A, Part B, Home Health) — please complete an attestation for each.
  3. Complete a HETS EDI Enrollment form for each vendor using their unique IDs (UID):
    1. Experian UID: 6EQK
    2. Availity UID: QLUU

Locations

Headquartered in Orlando, Florida, AssistRx has six locations including offices in Kansas and Iowa:

123

AssistRx Headquarters

495 North Keller Road,
Suite 100
Maitland, Florida 32751

P: 877.450.4412

CoAssist Pharmacy

2400 Sand Lake Road,
Suite 200
Orlando, Florida 32809

P: 855.382.2533
F: 833.596.2174

Southpark Orlando Office

9400 Southpark Center Loop,
Suite 200
Orlando, Florida 32819

F: 407.232.8838

Patient Solutions and Free Drug Pharmacy

4500 W. 107th Street
Overland Park, Kansas 66207

P: 866.930.4146
F: 866.930.4147

Patient Solutions Extension Office

4551 W. 107th Street
Suite 210
Overland Park, Kansas 66207

Innovation Office

317 6th Avenue,
5th Floor
Des Moines, Iowa 50309

Frequently Asked Questions

Who is AssistRx?

AssistRx is a leading advanced therapy initiation and patient support solutions provider that delivers the perfect blend of technology and expertise to improve patient uptake, visibility and outcomes. Our services include medical benefit verification, and we are reaching out to avoid disruptions in providing seamless, best-in-class experiences for your Medicare patients and their caregivers.

Experian and Availity are data sources that provide secure and compliant access to PHI. AssistRx partners with them to perform benefit verifications and other support services on behalf of HCPs.

UIDs are tied solely to eligibility vendors. Completing the HETS attestation for Experian and/or Availity using their respective UIDs will satisfy AssistRx requirements. No separate AssistRx attestation is needed.

For additional questions or to get support with the attestation process, please contact CMS at 1-866-324-7315 or mcare@cms.hhs.gov.

Instructions and links on this page are sourced from https://www.cms.gov/data-research/cms-information-technology/hipaa-eligibility-transaction-system-hets/hets-edi-how-enroll. Please use this link for the latest available information and guidance.

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