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Prior Authorization Services for US Practices
Prior authorization is the payer’s pre-approval for a specific CPT, units, and date range — obtained before the service, tracked to a decision, renewed before it expires, and matched to the claim. Vector Medical Billing runs the request inside your EHR from Jamaica, NY, for practices in all 50 states.
Permission, not coverage
What prior authorization is — and what it is not
Active insurance does not mean every service is allowed. Plans publish lists of CPT codes, sites of service, and admission types that need advance approval.
Prior authorization (precertification, pre-cert, PA) is the payer’s yes-or-no — sometimes with conditions — before the patient receives the service. The approved auth carries a reference number, approved units or dates, and often a rendering provider or facility constraint. Billing must put that number on the claim exactly as issued.
This is not eligibility verification. Eligibility answers whether the member is active and which plan is primary. Prior auth answers whether this MRI, injection series, inpatient stay, or DME item may be performed under this plan. A patient can pass eligibility and still hit a missing-precert denial (CARC 197 and similar) if auth was skipped, expired, or never attached to the claim.
Two clocks — do not quote them as one
Submission is yours. The decision belongs to the payer.
Submission clock
Getting a complete clinical package into the payer’s channel — portal, ePA / 278, fax, phone, or a radiology benefit manager such as eviCore or Carelon. Incomplete packets get pended, not approved. Starting at the order date, not the morning of the procedure, is what leaves room for a request for more information.
Payer decision clock
For Medicare Advantage, Medicaid, and CHIP plans covered by CMS-0057-F, decision timeframes from 2026 are 72 hours for expedited requests and seven calendar days for standard ones. Marketplace QHP issuers and drug decisions follow different rules. Those are payer clocks — not a Vector turnaround guarantee you can print as an SLA.
Services that commonly need prior authorization
Exact lists change by payer and quarter. The check is by plan and CPT — not last year’s memory.
Advanced imaging and diagnostics
MRI, CT, PET, nuclear studies, and sleep studies often route through the payer portal or a utilization vendor. Auth usually ties to specific CPT and place of service.
Procedures, injections, DME, specialty drugs
Elective surgery, pain injections, durable medical equipment, and specialty drugs on the medical benefit when the plan requires clinical criteria before the date of service. Buy-and-bill and pharmacy channels may each have their own path.
Admissions, therapy, behavioral health
Inpatient and observation admissions, residential behavioral health, extended PT/OT/ST visit blocks, and home health episodes when the plan caps units or requires initial certification.
How prior authorization requests are obtained and tracked
Complete on the first submit. Tracked to a decision — not closed at a confirmation screen.
1
Requirement check
Payer, plan, CPT, site, and rendering provider checked when the service is ordered — early enough to absorb a request for more clinicals.
2
Clinical package
Notes, ICD-10, prior treatment, imaging, and the documentation that payer’s policy asks for. Incomplete packs get pended, not approved.
3
Submit and track
Portal, ePA / 278, fax, phone, or RBM vendor. Status stays open until approved, denied, or withdrawn — then escalated if the payer exceeds its own clock.
4
Record the auth
Auth number, CPT, units, date range, and site go into the EHR so charge entry and claims can carry them.
AMA physician survey data describes prior auth as a major weekly administrative burden for practices — published source context for why tracking is outsourced, not a Vector performance claim.
How an authorization fails — and what prevents it
Most PA denials that hit the claim are process failures, not clinical disagreements.
| What went wrong | What actually happened | How the workflow prevents it |
|---|---|---|
| Requirement not known | This plan required auth for this CPT and nobody checked | Requirement determined by payer, plan, and code at scheduling |
| Request pended | Submitted without the clinicals the payer’s criteria ask for | Clinical package built to published criteria before submit |
| Approval never attached | Auth exists in a fax inbox, not on the claim | Auth number stored on the patient account at approval |
| Units exhausted | Therapy or injections continued past approved count | Units tracked; renewal before the last covered visit |
| Auth expired | Procedure rescheduled past the approval window | Validity dates tracked; re-request when the date moves |
| Clinical denial | Criteria not met or not evidenced | Appeal with the record; peer-to-peer when the payer offers it |
The authorization has to match the claim
An approval for the wrong CPT or an expired date range is still a denial.
| On the authorization | What goes wrong on the claim |
|---|---|
| Auth number | Missing from Box 23 / 837 equivalent — denial even when approval existed (CARC 197-class) |
| Specific CPT / HCPCS | Contrast added, level changed, or a different procedure billed than approved |
| Unit or visit count | Therapy series or injections run past approved units without a modification |
| Date range | Service rendered after the auth expired, or before it was effective |
| Site of service / rendering NPI | Different facility or provider than the one on file |
Before submission, billed CPT and units are compared to the auth on file. If they differ, the claim is held for a modification — not forced through. Detail on claims submission.
Peer-to-peer, appeals, renewals, and retro auth
Tracking does not stop when the payer answers no.
Peer-to-peer and appeals
When the payer denies on clinical grounds, a peer-to-peer can be scheduled between your provider and the plan’s medical director. Vector books the slot, prepares the denial reason, policy criteria, and clinical packet — a cold call rarely overturns a written denial. In Medicare Advantage, published KFF analysis of CMS data has shown appeals are filed on a small share of denials while a large share of filed appeals are overturned — labeled public data, not a Vector client result.
Renewals and retroactive requests
Authorizations expire and units run out. Therapy, DME, and treatment plans need renewal before the next visit. Emergent services may follow a concurrent or retro path when the plan allows it — still documented, still tracked. Retro auth for non-emergent care that was simply skipped is rarely granted.
How prior authorization is priced
On a full-cycle Vector Medical Billing engagement, prior authorization for current patients in your specialty mix is inside the monthly percentage. Outsourced PA-only vendors in the US commonly publish roughly $7–$25 per request by complexity, or a dedicated-staff weekly rate. The CAQH Index has put provider-side cost of a manual authorization in the low teens of dollars per transaction. Those figures are market benchmarks, not Vector’s published client rate.
Bands are on the medical billing page. Ask for a written rate with your auth volume by payer.
Where the work sits
Eligibility flags that auth may be required. Prior auth obtains it. Coding and charge entry come after the visit. Missing auth on the remittance is a denial — not a posting problem.
Prior auth tracked where billing can use it
Send your top payers, auth-heavy CPT list, and EHR. We outline PA scope inside the billing engagement — including P2P scheduling when denials need a clinician on the line. Written quote, no invented approval percentage.
ePA
Portal / 278
P2P
Clinical Review
Match
Auth to Claim
50
US States
Prior authorization questions
Straight answers tied to the sections above.
What is prior authorization in medical billing?
Payer approval before specific services are performed, documented with a reference number and often limits on dates, units, or site. It is separate from checking active coverage.
How is it different from eligibility verification?
Eligibility confirms the member and plan. Prior auth confirms the plan allows the scheduled service. See eligibility verification.
Which services usually need prior auth?
Imaging, many surgical and pain procedures, DME, infusion and specialty drugs on the medical benefit, admissions, and extended therapy blocks — exact lists are payer-specific and change.
What happens if we render care without an auth?
Many plans deny in full when precert was required. Retro auth is sometimes available for emergent care but not guaranteed for elective services that were simply skipped. Claims often hit CARC 197-class edits.
Do you work eviCore, Carelon, and other RBMs?
Yes. When imaging or other services route through a radiology or utilization benefit manager, the request goes there under that vendor’s clinical criteria — not only the health plan portal.
Do you handle peer-to-peer reviews?
Yes — scheduling, documentation brief, and logging the outcome. The treating provider joins when the payer requires a clinician on the call.
Is prior auth included in the monthly billing fee?
Routine PA for scoped specialties is part of the full-cycle engagement. Auth-only high-volume projects are quoted separately.
How much do outsourced prior authorization services cost?
Standalone vendors often quote roughly $7–$25 per request or a dedicated FTE rate. Vector bundles standard PA into the monthly billing percentage — ask for a written quote for your volume.
Do we change our EHR?
No. Auth numbers and status are documented in Athenahealth, eClinicalWorks, Tebra, AdvancedMD, DrChrono, NextGen, CareCloud, Practice Fusion, CureMD, Office Ally, or another system confirmed before start.