Insurance eligibility verification is checking — before care is delivered — that a patient's insurance is active and covers the planned service. Done right, it happens electronically in seconds through a 270/271 transaction. Done wrong (or not at all), it produces the most expensive kind of denial: one you discover a month after the visit, when the payer returns the claim marked coverage terminated and your best collection window is already gone.
The Claim You Find Out Is Dead 30 Days Later
Here's the failure pattern, and it's remarkably consistent: the patient was covered last visit, so nobody re-checks. The policy lapsed — job change, missed premium, Medicaid redetermination. The visit happens, the claim goes out, and weeks later the 835 comes back: PR-27, expenses incurred after coverage terminated, $0 paid. Now you're billing a patient who may not know they were uninsured, for care delivered a month ago.
The scale of this problem: registration and eligibility errors cause about 27% of all denials — the single largest category per the Change Healthcare Denials Index — and roughly half of all denials originate at the front end of the revenue cycle. In our own remittance analysis for a behavioral-health group, coverage-termination denials were the largest preventable denial category on the file.
What a 270/271 Check Actually Is
The electronic version is a paired X12 EDI transaction: your system sends a 270 (the question: “is this member covered on this date for this service type?”) and the payer returns a 271 (the answer) — usually in seconds. Per the 2024 CAQH Index, eligibility checks are healthcare's highest-volume administrative transaction — over 31 billion a year.
A good 271 tells you much more than active/inactive:
- Coverage status and effective dates
- Plan type and name (HMO, PPO, Medicare Advantage)
- Copay and coinsurance by service type
- Deductible — total, met, and remaining
- Out-of-pocket max and remaining
- Other-payer hints (coordination of benefits)
One honest caveat competitors rarely mention: payers vary. Some return rich benefit detail; some return little more than active/inactive, which is why a good verification workflow has an exception path, not just an API call.
Manual vs Electronic: The Cost Gap
A phone-call verification consumes staff time — hold music, IVR menus, one payer at a time. CAQH pegs the cost gap at several dollars per transaction between manual and electronic checks, and estimates ~$10 billion a year in remaining savings from full eligibility automation. For a busy clinic, the practical difference is one front-desk person doing verification full-time versus a nightly batch job doing it for free.
The Three-Checkpoint Workflow
Best practice is three checks, not one:
- At scheduling — run the first 270/271 the moment the appointment is booked. Catches typos in the member ID, wrong payer, and already-terminated plans while there's time to fix them.
- 48 hours before the visit — a nightly batch re-checks the entire upcoming schedule. Coverage churns constantly (job changes, plan-year resets, Medicaid redeterminations), so a check from booking day can be stale. Exceptions land on a worklist a human resolves before the patient arrives.
- At check-in — targeted real-time re-check for flagged cases, plus use the 271's deductible-remaining data to collect the patient's share upfront — the moment collection rates are highest.
The critical piece most practices miss is checkpoint 2: re-verifying patients who were “already verified.” Termination denials almost always come from returning patients, precisely because nobody re-checks them.
Eligibility vs Prior Authorization
Related but different: eligibility says the patient has coverage; prior authorization says the payer approved this specific service in advance. A patient can be fully eligible and the claim still dies on CO-197 because nobody obtained the auth. A complete front-end check does both — and if authorization is your bigger problem, see our guide to prior authorization automation.
What This Prevents, in Denial Codes
An automated three-checkpoint workflow directly prevents the front-end denial family: PR-27 and CO-26 (coverage dates), CO-22/CO-109 (wrong payer or COB), and most PR-31 (member not identified). That's the ~27% slice — the largest single share of denials — addressed by one workflow change. Our breakdown of the most common claim denial reasons shows where the rest come from.
We build eligibility automation into EHRs and billing platforms — 270/271 integration, batch re-verification jobs, exception worklists, and front-desk estimate screens. If coverage-termination denials keep appearing on your remits, our RCM engineering team can wire the checks into your existing workflow. Talk to our team.
