Payer Directory

How to check Medicare eligibility

A portal or phone check takes a front-desk staffer 10–15 minutes per patient. A real-time 270/271 check returns Part A & B status, deductibles, QMB status, and Medicare Advantage enrollment in seconds.

Payer ID CMSReal-time 270/271Enrollment required · hoursMedicare✓ Response verified July 2026

Three ways to verify Medicare coverage

Payer portal — free, but one patient at a time and 10–15 minutes each with logins.
Phone (IVR) — hold times vary; no written record for the chart.
Automated 270/271 check — full benefit detail in seconds, batched for the whole schedule, from $0.50 per check.

Medicare at a glance

What billers need before running a check.

Payer ID

CMS

Also known as 10001, CMSMED, MAPMC, MEDICARE

Real-time eligibility

After enrollment

A one-time enrollment is required before checks can run (about hours).

Coverage

dental, medical, vision

Medicare

Operating area

Nationwide

Member ID

MBI

Medicare Beneficiary Identifier — required on every check. Lost card? An MBI lookup can find it.

Medicare Advantage

Detected

The response flags MA enrollment and names the plan to bill instead

Payer website

www.cms.gov

What a live Medicare check returns

Documented from real 271 eligibility responses. This is the actual level of detail — not a marketing summary.

Eligibility response · Medicare (CMS)271 · 0.8s

Coverage

Medicare Part A (hospital, home health, hospice)ACTIVE since 2019-01-01

Medicare Part B (medical, surgical, diagnostic)ACTIVE since 2019-01-01

Part D pharmacy coverageACTIVE separate payer listed

Entitlement reasonAge (OASI)

Cost sharing

Part B deductible remaining$0 · calendar year

Part A deductible remaining$0 · per episode

CoinsurancePer visit

Qualified Medicare Beneficiary (QMB)FLAGGED patient cannot be billed cost-sharing

Billing alerts

Medicare Advantage enrollmentDETECTED HMO Medicare Risk — bill the MA plan

Coordination of benefitsEffective 2023-01-01

Routine dental · long-term careNOT COVERED

Sample response structure from a real-time check. Amounts and dates vary per patient; no real patient data is shown.

Why this matters: The two most expensive Medicare billing mistakes — billing Original Medicare when the patient has a Medicare Advantage plan, and billing cost-sharing to a QMB patient — are both visible in this response before the visit happens.

Supported transactions

What can be exchanged electronically with Medicare today.

Transaction	Status
Eligibility (270/271) Real-time benefit and coverage checks	ENROLLMENT REQUIRED
Claim status (276/277) Where a submitted claim stands	NOT AVAILABLE
Professional claims (837P) Physician and outpatient claims	NOT AVAILABLE
Institutional claims (837I) Facility claims	NOT AVAILABLE
Dental claims (837D) Dental claims	NOT AVAILABLE
Remittance (835 ERA) Electronic remittance advice	NOT AVAILABLE
Coordination of benefits Secondary-payer routing	NOT AVAILABLE
Claim attachments (275) Supporting documentation	NOT AVAILABLE

Portal vs. phone vs. automated

The same verification, three ways.

	Payer portal	Phone / IVR	Automated check
Time per patient	10–15 min	15–30 min	Seconds
Cost per check	~$6.72 staff time*	~$6.72+ staff time*	from $0.50
Record for the chart	Screenshot	None	Full audit trail
Whole-day schedule	One at a time	One at a time	Batched overnight

*CAQH Index benchmark for a manual eligibility verification.

Frequently asked questions

What is the payer ID for Medicare?+

Medicare uses payer ID CMS. It also appears as 10001, CMSMED, MAPMC, MEDICARE in some systems.

Does Medicare support real-time eligibility verification?+

Yes. Medicare supports real-time 270/271 eligibility checks after a one-time enrollment that typically takes hours. Once enrolled, checks return in seconds.

How long does a Medicare eligibility check take?+

A portal check takes 10–15 minutes of staff time per patient. An automated real-time check returns in seconds and can run for an entire day's schedule overnight.

Does a Medicare eligibility check show Medicare Advantage enrollment?+

Yes — this is one of the most valuable fields in the response. If the patient is enrolled in a Medicare Advantage plan, the check flags it and identifies the plan that should be billed instead of Original Medicare, preventing an automatic denial.

What if the patient doesn't know their MBI?+

An MBI lookup can retrieve the patient’s Medicare Beneficiary Identifier from their name, date of birth, and SSN — then the eligibility check runs normally.