What is Medicare eligibility verification for providers?

Medicare eligibility verification is the process providers use to confirm a patient’s Medicare coverage status, plan type, deductible amounts, and cost-sharing obligations before delivering care. It’s done using HIPAA 270/271 transactions through CMS’s HETS system, accessed via a clearinghouse or practice management software. Every practice that bills Medicare needs a real-time process for this check before each visit.

What is changing with Medicare eligibility verification in 2026?

CMS is pushing toward mandatory real-time eligibility verification through HIPAA 270/271 transactions via HETS. Practices still relying on phone IVR checks, batch-only workflows, or outdated clearinghouse configurations will face stricter expectations and higher claim denial rates as this standard tightens through 2026.

Which CMS tool do providers use to verify Medicare eligibility?

Providers use the HIPAA Eligibility Transaction System (HETS), either directly as an approved submitter or through a clearinghouse or practice management system with a HETS connection. HETS processes 270 eligibility inquiries and returns 271 responses with full coverage details in under 3 seconds. Most practices access HETS through a clearinghouse, which is the simpler and more practical path.

Does Medicare eligibility verification affect claim denials?

Yes. Eligibility errors are linked to up to 23% of all Medicare claim denials. Each denied claim costs between $25 and $118 to appeal and resubmit. Fixing the verification process upfront is far cheaper than managing the denial volume on the back end.

What is real-time eligibility verification?

Real-time eligibility (RTE) is the ability to query a payer’s system and receive an immediate response about a patient’s coverage, benefits, and cost-sharing obligations. For Medicare, this means a HETS 270/271 transaction returning results in under 3 seconds. Batch files that run overnight or on a schedule are not real-time and don’t meet the 2026 standard.

What is a HIPAA 270/271 transaction?

A 270 is an electronic eligibility inquiry sent from a provider to a payer. The 271 is the payer’s response with coverage, benefit, and cost-sharing details. These are the HIPAA-standard electronic transaction pair for checking insurance eligibility. For Medicare, both are processed through the HETS system.

What happens if a provider doesn’t verify Medicare eligibility?

Claims deny at a significantly higher rate, staff time gets consumed by appeals and resubmissions, and repeated eligibility failures can flag a practice for CMS review. The cost of not verifying consistently is far higher than the cost of setting up a proper verification workflow. Most practices recover the setup cost within the first few months of reduced denials.

How does secondary insurance affect Medicare eligibility verification?

About 80% of Medicare patients carry some form of secondary coverage such as Medigap, Medicaid dual eligibility, or employer retiree plans. The 271 response often includes secondary payer data. Missing or ignoring it leads to incorrect cost-sharing calculations, patient balance billing errors, and underpaid or denied claims.

Medicare Eligibility Verification: 2026 CMS Rules Explained