How Often Should You Verify Insurance Eligibility? Timing and Re-Checks

Updated November 5, 2026, based on CMS, CAQH CORE and the Code of Federal Regulations as of that date.

Check eligibility at least twice for a new visit: when it's scheduled, and again a few business days before the date of service. For recurring patients, re-check before each billing period, usually monthly, and whenever coverage is likely to change. Federal rules set how fast a payer must answer an eligibility request. They don't tell a provider how often to send one, so the schedule is yours to set.

This guide is for the intake or front desk lead who decides when checks run. It covers how far ahead a check is useful, the points in the year when coverage tends to change, how to re-check recurring patients without checking everyone every day, and what a payer owes you in response time.

Check when the visit is booked, then again before it

The first check, at scheduling, tells you whether there's a problem worth solving before the patient arrives: a terminated plan, a missing secondary, the wrong member ID. Finding it a week out leaves time to call the patient. Finding it at the front desk usually doesn't.

The second check, a few business days before the visit, catches what changed in between. For most clinics that means running the whole day's schedule in one batch rather than clicking through patients one at a time.

Batch timing is predictable. Under the CAQH CORE batch response time rule, adopted for all health plans by 45 CFR 162.1203, a batch of 270 requests submitted by 9:00 pm Eastern on a business day must be answered by 7:00 am Eastern the next business day. The rule lets each health plan define its own business days. A batch sent the evening before a business day should be back before the clinic opens.

A 271 answers for the date you ask about

An eligibility response reflects the date of service in the request. Ask about today and you learn about today. To learn whether the patient will be covered on the visit date, send the visit date.

How far ahead a payer will answer varies. For Medicare, CMS's HETS 270/271 page says the system accepts requests for dates up to four years in the past and up to four months in the future from the transaction date. A request outside that window comes back with an AAA error, AAA03 code 62, "Date of Service Not Within Allowable Inquiry Period." One worked example on that page shows an end date that doesn't match, but the current HETS companion guide gives the same four-month window. The same page notes that HETS accepts real-time transactions only, not batch. Commercial and Medicaid payers set their own windows, so check each payer's companion guide. Our guide to insurance eligibility verification covers what to read in the response itself.

When coverage is most likely to change

Several kinds of coverage change happen on known dates. Time the extra re-checks around them.

January and the first quarter for Medicare Advantage

Under 42 CFR 422.62, the annual coordinated election period runs October 15 through December 7. Changes made then take effect on the first day of the next calendar year, per 42 CFR 422.68. People already in a Medicare Advantage plan get one more election during the first three months of the year. Those changes take effect on the first of the month after the election. So re-check every Medicare patient in early January, and re-check Medicare Advantage patients at the start of February, March and April.

Medicaid renewals, and changes between them

Under 42 CFR 435.916, states renew eligibility for most Medicaid enrollees once every 12 months. The state must also promptly redetermine eligibility between renewals when it learns of a change that may affect it, such as new income. Coverage can end mid-cycle.

That cycle is changing for one group. CMS's State Medicaid Director letter SMD #26-001 says states must renew most adults in the Medicaid expansion group once every six months, beginning with renewals scheduled on or after January 1, 2027. The same letter notes a second change for applications made on or after that date: expansion adults will be limited to one month of retroactive eligibility before the month of application. Today 42 CFR 435.915 allows up to three months. States set their own renewal calendars, so ask your state Medicaid agency or plan how it will schedule them.

For your team, six-month renewals mean twice as many points a year when a Medicaid patient's coverage can lapse. If you serve many expansion adults, know each patient's renewal month and re-check in the month after it.

Marketplace grace periods

Under 45 CFR 156.270, a Marketplace enrollee who gets advance premium tax credits and stops paying premiums has a three-month grace period. The plan must pay claims for the first month. It may pend claims for services in the second and third months, and it must notify providers of the possibility of denied claims. If you get that notice for a patient, re-check before booking more services, and tell the patient their coverage is at risk.

Employer plans and life events

Employer plan years vary by employer, and job changes happen at any time. Ask at check-in whether the patient has a new card or a new employer, and re-check when the answer is yes.

Re-checking recurring patients without checking everyone daily

Checking every follow-up visit by hand can take hours a day, which is why some teams only check new patients. That leaves the recurring patients, whose coverage can change at any of the points above, unchecked. A tiered schedule covers both.

1. Check every new patient at scheduling and again before the first visit.
2. Re-check every recurring patient once a month, ideally in the first days of the month, since Medicare Advantage election changes take effect on the first of a month.
3. Add the calendar re-checks above: January for everyone with Medicare, February through April for Medicare Advantage, and the month after each Medicaid renewal.
4. Re-check right away on any trigger: a new card, a new employer, a move, a grace-period notice, or an eligibility denial on a recent claim.
5. For services that repeat on a fixed schedule, such as weekly therapy or home care, re-check before each authorization or billing period so a lapse doesn't stop services without notice.

Write the schedule down, and pick an owner for each step. The batch runs are easy to automate. The triggers depend on someone noticing them.

Answering a new inquiry on the spot

When a new patient calls, a real-time check usually gives you an answer while they're on the line. The CAQH CORE real-time response rule sets a maximum response time of 20 seconds from submission of the 270. A plan meets the rule if 90% of its responses in a calendar month come back within that time.

Real-time coverage status is enough to say whether a patient's plan is active. Benefit detail, such as visit limits or whether a specific service needs prior authorization, may not be in the 271 for every plan. If billing usually needs a day or two to confirm benefits, tell the caller what the real-time check showed and when they'll hear the rest.

Frequently asked questions

Is there a rule for how often a provider must verify eligibility?

The federal rules HHS adopted for eligibility transactions, the CAQH CORE operating rules, cover how payers answer requests, including the 20-second real-time limit and the next-morning batch deadline. They don't set how often a provider asks. Payer contracts and provider manuals may set their own expectations, so check those for your major payers.

How far in advance can I check Medicare eligibility?

CMS says HETS accepts requests for dates of service up to four months in the future. A date outside the allowed window returns AAA03 code 62. Other payers set their own windows.

Should I re-check eligibility before every visit?

For new patients, yes. For recurring patients, a monthly re-check plus the calendar and event triggers above catches those changes without a check before every visit. Patients on Medicaid or with a grace-period notice merit closer attention.

What changes when Medicaid renewals move to every six months?

Starting with renewals scheduled on or after January 1, 2027, most expansion adults will renew twice a year instead of once, per CMS's SMD #26-001. Each renewal is a chance for coverage to lapse, so plan a re-check after each one.

Why did a claim deny for eligibility when the check passed?

Check two things first: whether the 270 asked about the same date as the claim's date of service, and whether coverage changed after the check. Then re-check for the date of service before you correct or appeal.

Re-checking eligibility for every recurring patient?

Champ automates portal work like eligibility checks across payer portals. We set it up and run it, so your staff sees only the finished results. If monthly re-checks are taking your front desk away from patients, learn more here.

This post is general information, not legal, compliance or billing advice. Rules vary by payer and state and change often, so confirm with the payer or your state Medicaid agency before acting. Champ is not affiliated with or endorsed by CMS, HHS, CAQH, or any payer or state agency.