By Harris Mahmood, Director of RCM & Credentialing Operations, BilNow
LinkedIn: Harris Mahmood
LinkedIn: BilNow Medical Billing and Revenue Cycle Management System
Many denials trace back to a front desk moment, not a coding mistake. A patient changed jobs, aged into Medicare, or lost Medicaid at a renewal, and nobody noticed until the claim came back. A single eligibility check on the day of the visit is not enough to prevent this. What helps is a short, repeatable routine that checks coverage at the right moments and reads the response carefully.
Check at three moments, not one
Run eligibility when the appointment is booked, again two to three business days before the visit, and a final time at check-in. The first check confirms the patient has a plan on file. The second leaves time to call the patient if something changed. The third catches terminations that happened in between. For recurring visits, such as therapy or dialysis, repeat the check at the start of each month, because coverage can change between visits even when the patient does not mention it.
Read the whole response, not just the active flag
An “active” status is only the start. Medicare’s own eligibility system returns more than a yes or no. According to the CMS HETS 270/271 companion guide, a response can include Medicare Secondary Payer information and Medicare Advantage or Part D plan enrollment where applicable. If the response shows a Medicare Advantage plan, the Original Medicare claim you were about to send will be rejected, and the patient’s plan should be billed instead.
Two limits are worth knowing. CMS states that the Medicare eligibility transaction system covers fee-for-service Medicare only, so it cannot confirm coverage under a Medicare Advantage or Part D plan. And an eligibility response is not a promise of payment. It reflects coverage on the date of the inquiry, subject to plan terms.
Ask the coordination of benefits question every time
Who pays first is a separate question from whether coverage exists. CMS describes the Medicare Secondary Payer rules as preventing Medicare from paying when a group health plan, workers’ compensation, liability, or no-fault insurance is expected to pay first. The details matter. The CMS MSP fact sheet explains that for patients 65 and older with employer coverage based on current employment, Medicare is secondary when the employer has 20 or more employees. For people under 65 with a disability, the employer size threshold is 100 or more employees.
That means a patient who says “I only have Medicare” may still have an employer plan that should be billed first. Build the question into registration: Are you or your spouse currently working? Did this visit result from an accident or injury? A yes to either should trigger a closer look before the claim goes out, and the answers should be recorded with the date they were collected.
Watch for Medicaid renewal gaps
Medicaid coverage can end quietly. Federal guidance on Medicaid and CHIP eligibility renewals describes how states must redetermine eligibility at regular intervals, generally every 12 months for most beneficiaries, and must first try to renew coverage using information they already hold. That is good for patients, but it also means a patient may not know a renewal happened or that a form was requested. Medicaid patients deserve an eligibility check at every visit, not only at registration, and a clear note in the chart when a renewal date is approaching.
Build a simple exception list
Eligibility results are only useful if someone acts on them. Keep a daily exception list of every patient whose check showed inactive coverage, a plan change, a different payer than expected, or a coordination of benefits flag. Assign each item to one person with a deadline that falls before the appointment. A practical rule: no exception stays open past noon on the day before the visit.
When a patient’s coverage cannot be confirmed, the conversation should happen before they are in the exam room. Staff can ask for a new card and confirm the plan name and member ID.
Measure what you catch
Track three numbers each month: the share of visits with a completed check before the appointment, the number of coverage changes found before the visit, and the number of eligibility related denials. If the second number is climbing while the third is falling, the routine is working.
A short checklist
Check at booking, three days out, and at check-in. Read plan type, payer order, and any secondary payer details in each response. Ask the working status and accident questions at every registration. Repeat checks monthly for recurring care and at every Medicaid visit. Work the exception list daily, with an owner and a deadline. Review the monthly numbers with the whole front desk team.
None of this needs new software. It needs a consistent routine, staff who understand what the response is telling them, and a habit of acting on exceptions while there is still time to fix them.