Real-time eligibility (270/271) explained for front desks

Every front desk verifies insurance. Most do it the morning of the visit, by portal or phone, which is too late to fix a lapsed plan and too late to tell the patient their copay before they are standing at the counter. Real-time eligibility moves that check to the moment the appointment is booked, and if the phone is answered by software, to the call itself. Here is what the transaction does, in plain words.

270 and 271 in one paragraph

The X12 270 is a standardized electronic request: "Is this person covered by this payer for this kind of service on this date?" The X12 271 is the payer's standardized answer. Every HIPAA-covered payer in the United States must support the pair, which is why a single clearinghouse connection can check Delta Dental, Blue Cross, Aetna, UnitedHealthcare, Medicare and most state Medicaid plans. A round trip usually takes two to ten seconds.

What goes into the 270

• Subscriber (or dependent) name, date of birth and member ID. The ID is the field that most often fails; the AI should read it back digit by digit.
• Payer ID, taken from the plan name the patient gives, with a lookup for common nicknames ("Blue Cross" needs a state and product).
• Provider NPI and, for some payers, tax ID.
• Date of service: the appointment date, not today.
• Service type code: 30 is "health benefit plan coverage" (the general check); 35 is dental care; 98 is professional physician visit; AL is vision; MH is mental health; PT is physical therapy. Asking for the right service type is what turns a yes/no into useful detail.

What comes back in the 271

• Active or inactive on the date of service, with plan begin and end dates.
• Plan and product name, which often differs from what the patient said.
• Benefits by service type: copay, coinsurance, deductible and how much of it is met, out-of-pocket remaining, and whether the benefit is in or out of network.
• Limitations: for dental, preventive frequency (two cleanings a year, one set of bitewings); for physical therapy, visit limits and visits used; for mental health, whether authorization is needed.
• Primary care or referring provider requirements on HMO products.
• Sometimes other coverage, which is your coordination-of-benefits clue.

Why checking on the booking call matters

Three things change when eligibility is confirmed while the patient is still on the phone. First, the patient hears their copay or preventive coverage before they commit, which lowers surprise-bill complaints and the no-shows that come from coverage doubt. Second, a lapsed or wrong plan is caught days before the visit instead of minutes before, so the patient can call the employer or bring the new card. Third, the front desk does not re-check on the day: the 271 is stored against the appointment with its timestamp.

How to read a 271 at the desk

Look at four lines: active status, the service-type benefit that matches the visit, the network indicator and any limitation. If the response shows a remaining deductible, say so plainly: "Your plan is active; you have $400 of deductible left, so today's visit will likely be billed to you." If it shows a visit limit, record visits used. If it says "authorization required", create a task before the visit, not after.

What a real-time check cannot tell you

• It is not a guarantee of payment. Claims can still deny for medical necessity, coding or timely filing.
• It may not reflect a termination the employer reported yesterday; re-check if the visit is more than 30 days out.
• Dental 271s vary widely in how much frequency detail they include; some payers return only active status.
• Medicaid managed care plans sometimes need a second check against the state plan.

Setting up real-time eligibility in a practice

You need a clearinghouse connection (most practice management systems and EHRs already have one), the payer IDs for your top twenty plans, your NPI on file and a rule for which service type to request per appointment type. Then decide where the result is stored: against the appointment, in the insurance record, or both.

How Clinic Answering Service uses 270/271

On the Practice and Group plans, Clinic Answering Service runs the 270 while the patient is still talking, with the service type set by the appointment type (dental, physician visit, PT, mental health), reads back active status and the matching benefit in plain words, flags authorization or lapsed coverage to the front desk and stores the 271 with its timestamp against the booked visit.

Connection status and safeguards

As of October 2026 the clearinghouse connection is a sandbox: results are generated test data, labelled "Sandbox test data, not a payer response" in the app, until a clearinghouse is contracted for your account. Once live, the safeguards are the same: the assistant repeats only what the 271 states, says the plan "shows as active" rather than "you are covered", never quotes a final price or guarantees payment, and never reads back more than the payer returned. If the payer or clearinghouse times out, returns an error or reports an inactive plan, the visit is still booked, the patient is told the front desk will confirm coverage, and a task goes to your staff. Each result shows when it was checked; re-run it if the visit is more than 30 days away. The result supports your front desk and never replaces its judgement. See the live eligibility feature and the specialty packs for the service types each uses.

A worked example: booking a hygiene visit

A patient calls a dental office on a Thursday evening to book a cleaning. The answering service confirms her name and date of birth, finds her Delta Dental member ID on file and sends a 270 with service type 35 (dental care) and next Tuesday as the date of service. Four seconds later the 271 returns: coverage active, preventive covered at 100%, one of two cleanings used this benefit year, annual maximum $1,500 with $1,180 remaining.

The assistant says: "Your Delta Dental plan is active and your cleaning is covered at 100%. I have Tuesday at 9:30 or Wednesday at 4:00." She picks Tuesday. The appointment is written to the schedule, the 271 is stored against it, and on Tuesday morning nobody re-verifies. If the 271 had come back inactive, the assistant would have booked the visit, told her the plan did not show as active and flagged it for the front desk to call her on Friday, days before the visit instead of minutes before.

That is the whole value of moving eligibility to the booking call. The dental office answering service page shows the dental pack's other call types, and live eligibility is included on the Practice and Group plans; see pricing.

Questions people ask

Is a real-time eligibility check the same as a prior authorization?

No. Eligibility tells you whether the plan is active and what the benefit is. Authorization is a separate payer approval for a specific service, and the 271 can only tell you that one is required.

How accurate are 271 responses?

Active/inactive status is highly reliable. Benefit detail depends on the payer and service type; dental frequency limits and deductible-met amounts are the fields most often incomplete, so treat them as guidance and confirm on claims.

Does running eligibility on every call cost money?

Clearinghouses typically charge a small per-transaction fee or a flat monthly amount. Clinic Answering Service includes eligibility transactions in the Practice and Group plans with no per-check fee once a clearinghouse is contracted; until then checks run in sandbox mode.