Precertification vs. prior authorization vs. predetermination
Precertification, predetermination, and prior authorization all describe a health plan reviewing a proposed service before it is furnished, but the three terms are not interchangeable. In common usage, prior authorization and precertification refer to a required advance approval, while predetermination is usually a voluntary, advisory review that estimates likely coverage without committing to payment. How each label is defined varies by payer and plan, so the reliable approach is to read the specific payer's rules rather than assume the words mean the same thing everywhere.
Updated 6 min read
Reviewed by Anwaar Tayyab
Director of Billing Operations ·
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Key takeaways
- Prior authorization and precertification are frequently used interchangeably for a required, advance approval; predetermination is typically a voluntary, advisory review.
- None of the three guarantees payment — the claim is still adjudicated against eligibility, benefits, timely filing, and, outside the Medicare rules that limit it, medical necessity as documented on the claim.
- Which term a payer uses, and which services it applies to, varies by payer, plan, and over time.
- An approved request usually generates an authorization number, and the approved units and date range are expected to align with what is billed.
- A predetermination generally does not satisfy a prior authorization requirement when one exists.
How the three terms relate
All three terms sit under the umbrella of utilization management — the process a payer uses to decide, in advance, whether a planned service is appropriate under a member's benefits. Each involves submitting information about a proposed service so the payer can apply its coverage policies and its criteria for medical necessity. The differences lie in whether the review is mandatory, what the payer actually commits to, and where in the process it happens. Because the industry has never fully standardized this vocabulary, the same word can carry a slightly different meaning from one plan to the next.
- Prior authorization
- A required approval a payer must issue before certain services, drugs, or supplies are furnished; without it, the resulting claim is commonly denied.
- Precertification
- A payer's advance confirmation that a planned service — historically an inpatient admission or facility stay — meets its review criteria; many payers use the word as a synonym for prior authorization.
- Predetermination
- A voluntary request asking a payer to review clinical documentation and indicate whether a service would likely be considered covered and medically necessary, without committing to payment.
Prior authorization and precertification
For many payers, precertification and prior authorization are the same activity under two names. Precertification has roots in hospital admission review, so some plans still reserve the term for facility or inpatient care while using prior authorization for outpatient procedures, imaging, and drugs. Because that mapping is not standardized across the industry, the meaning that governs a given claim is whatever the payer's own provider manual and contract specify.
The labels do not always align
What predetermination is
Predetermination stands apart because it is generally optional. Rather than a gatekeeping requirement, it is a way to reduce uncertainty before an elective or high-cost service. The provider submits the proposed procedure with supporting clinical documentation, and the payer responds with an advisory opinion on whether the service would likely meet its coverage and medical-necessity standards. That opinion is an estimate based on the information available at the time — it generally does not lock in benefits or guarantee payment, and it does not verify a member's coverage on a future date of service.
A predetermination is not a prior authorization
Side-by-side comparison
The table below shows how the three reviews typically differ. The categories overlap and vary by payer and plan, and many plans treat prior authorization and precertification as synonyms — so the distinctions are tendencies, not universal rules.
| Dimension | Prior authorization | Precertification | Predetermination |
|---|---|---|---|
| Typically required? | Yes, for designated services | Yes, often for admissions or facility care | No, usually voluntary |
| What the payer decides | Whether to approve the service in advance | Whether review criteria are met before the service | Whether the service would likely be covered |
| Guarantees payment? | No | No | No |
| Effect if skipped | Claim commonly denied for no authorization | Admission or claim may be denied or reduced | No penalty; the review was optional |
| Common setting | Outpatient procedures, imaging, drugs | Inpatient admissions and facility stays | Elective or high-cost services |
Terminology and scope are set by each payer's contract and provider manual and can change over time — always confirm against the current source.
Why the distinction matters for billing
None of these reviews is the final word on payment. An approval reflects the information available and the plan's rules at the time of the request; the claim is still adjudicated separately against the member's eligibility on the date of service, the plan's benefits, coordination of benefits, and timely filing limits. Treating an approval as a payment guarantee is a common source of avoidable write-offs.
- The authorization number, approved units, and date range should align with what is billed; mismatches drive denials.
- Coverage is confirmed separately, because an approval does not verify that the plan is active on the service date.
- A denied prior authorization can often be challenged through an appeal or a peer-to-peer review.
- Tracking which term each payer uses helps ensure the correct request is submitted at the right point in the workflow.
The mechanics of building, submitting, and tracking these requests are covered across this cluster — from what prior authorization is and which services require it to approvals, denials, and peer-to-peer review. A related distinction — authorization versus a referral — is addressed separately.
Common questions
Is precertification the same as prior authorization?
Often, yes. Many payers use the two terms interchangeably for a required advance approval, though some reserve precertification for inpatient admissions or facility care and use prior authorization for outpatient services and drugs. The meaning that applies is defined by each payer's provider manual and contract, so it should be confirmed rather than assumed.
Does an approved prior authorization guarantee payment?
No, though what can be revisited afterward is limited. An approval reflects the plan's rules and the information available when the request was reviewed, and the claim is still adjudicated separately against eligibility on the date of service, plan benefits, coordination of benefits, and timely filing limits — and it can be denied on requirements that can only be evaluated once the claim is processed, or on information that was not available when the request was reviewed. Under the Medicare Advantage rules, a plan that approved an item or service in advance may not later deny coverage for lack of medical necessity, except by reopening the decision for good cause or on reliable evidence of fraud.
Is predetermination required?
Usually not. Predetermination is generally a voluntary, advisory review that estimates whether a service would likely be covered. It does not replace a prior authorization when the payer requires one, and skipping it carries no penalty because it was optional.
What is the difference between predetermination and prior authorization?
Predetermination is an advisory estimate of coverage and medical necessity that generally does not commit the payer, though under the Medicare prior determination process a positive determination is binding on the contractor absent fraud or misrepresentation. Prior authorization is a required advance approval whose absence commonly causes a claim to be denied. One reduces uncertainty; the other is a condition of payment for designated services.
Who decides which term applies to a service?
Each payer sets its own terminology, the list of services subject to review, and the process in its provider manual and contract. These rules vary by payer, plan, and state and change over time, so they should be checked against the current published source.
Key terms in this article
Defined once, on their own pages.
Continue learning
Where to go next in the prior authorization cluster.
What is prior authorization?
The foundational overview of advance approval and why payers require it.
Prior authorization vs. referral
How an advance approval differs from a referral to another provider.
Which services require prior authorization
How to tell which procedures, drugs, and settings trigger a review.
Prior authorization for medications
How drug reviews, step therapy, and pharmacy criteria work.
Approvals, denials, and peer-to-peer review
What happens after a request, including how to challenge a denial.
Authoritative sources
- 42 CFR 414.234 — Prior authorization for items frequently subject to unnecessary utilization (opens in a new tab)
eCFR. For DMEPOS items on the Required Prior Authorization List, defines prior authorization as a request for provisional affirmation submitted before the item is furnished and before the claim is filed, defines a provisional affirmation as a preliminary finding, requires denial of a claim that needed prior authorization and did not receive one (414.234(c)(2)(i)), and limits the grounds on which an affirmed claim can still be denied to technical requirements evaluable only at processing and information unavailable at the time of the request (414.234(c)(2)(ii)).
- 42 CFR 422.138 — Prior authorization (Medicare Advantage) (opens in a new tab)
eCFR. Limits the purposes for which a coordinated care plan may use prior authorization (422.138(b)), and provides that a plan which approved an item or service through prior authorization or a pre-service determination may not later deny coverage for lack of medical necessity, absent a reopening for good cause or reliable evidence of fraud (422.138(c)).
- 42 U.S.C. 1395ff(h) — Prior determination process for certain items and services (opens in a new tab)
United States Code, via govinfo. The statutory model for a voluntary advance coverage review: an eligible requester — a participating physician with the beneficiary's consent, or a beneficiary who received an advance beneficiary notice — may ask, before a physicians' service is furnished, whether it is covered; a positive determination binds the contractor absent fraud or misrepresentation; and declining to request one does not affect the right to furnish the service, bill for it, or appeal.