Eligibility Verification and Prior Authorization
Do the front-end work that prevents most denials, and understand the difference between coverage, authorization, and medical necessity.
By the end of this lesson you can
- Verify eligibility and interpret what a verification actually confirms
- Explain when prior authorization is required and how to obtain it
- Distinguish coverage, authorization, and medical necessity
- Use an ABN correctly for Medicare patients
Lesson Notes
Read through the key concepts before you try the challenge.
The cheapest denial is the one never generated
You work the front desk at Lakeside Medical Associates.
In Module 1 you found that 112 of last month's 138 denials originated before the patient was ever seen — eligibility, authorization, and missing information. Every one of those was preventable in the ninety seconds before the appointment, and each now costs far more to work than it would have cost to prevent.
Your task: Learn the front-end checks that stop denials being generated at all.
Eligibility verification confirms that the patient's coverage is active on the date of service and that your practice is in network. It is done electronically in seconds through a clearinghouse or payer portal, and it should happen twice: at scheduling, and again at check-in, because coverage changes between the two.
| Check | Confirms | Denial it prevents |
|---|---|---|
| Policy active on the date of service | Coverage has not lapsed | Coverage terminated |
| Member ID and group number | The claim will route correctly | Invalid subscriber information |
| In-network status | Contracted rates apply | Out-of-network reduction or denial |
| Copay, deductible, coinsurance | What to collect at the desk | Uncollected patient balance |
| Prior authorization requirements | Whether approval is needed first | No authorization on file |
| Referral requirements | Whether a referral is needed | No referral on file |
Three things are commonly conflated and are genuinely different. Coverage means the plan includes this benefit. Authorization means the payer has approved this specific service in advance. Medical necessity means the service was appropriate for the patient's documented condition. A service can be covered, authorized, and still denied for medical necessity if the documentation does not support it.
Handling a service Medicare may not cover
A Medicare patient is scheduled for a service you believe Medicare will consider not reasonable and necessary.
- 1
Confirm the likely non-coverage before the service, not after.
Check the applicable coverage determination. Discovering non-coverage after delivery means the practice either absorbs the cost or bills a patient who was never warned — and the second option is where complaints come from.
- 2
Issue an Advance Beneficiary Notice of Noncoverage and have the patient sign it.
The ABN is a specific CMS form telling the patient Medicare may not pay and that they may be responsible. Without it, you generally cannot bill the patient when Medicare denies. It must be given before the service and must state a genuine reason.
- 3
Append modifier GA to the claim line.
GA tells Medicare a signed waiver is on file. It is what preserves the practice's ability to bill the patient after the denial, and omitting it means the denial lands on the practice.
- 4
Never issue blanket ABNs routinely to every patient.
Routine ABNs issued without a specific expectation of non-coverage are invalid, and CMS treats the practice as one. The form exists to inform a patient about a particular service, not to shift all risk onto patients as a matter of policy.
Result: The patient is informed before the service, and the practice retains the right to bill them if Medicare denies.
The ABN protects the patient's right to decide and the practice's right to bill. It only works when it is specific, signed in advance, and flagged with modifier GA.
You verify eligibility and the payer confirms active coverage. The claim is later denied for medical necessity. What went wrong?
Challenge
Apply what you've learned in this lesson.
Build the front-end process that prevents the denials you costed in Module 1.
- Write a front-desk verification checklist covering every item in the table above, formatted so someone could work through it in ninety seconds.
- Research the CMS ABN form (CMS-R-131). Note the three things the form must state to be valid.
- Explain in three sentences the difference between coverage, authorization, and medical necessity, using an example of a service that could fail each one.
- Given 61 eligibility denials and 29 authorization denials last month, write a two-paragraph recommendation to the practice manager naming what you would change and how you would measure it.
Finished this lesson?
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