Why insurance authorization problems cause denials
Fastora's prior authorization services take payer calls, portal submissions and tracking off your front desk. As an outsourced prior authorization team, we handle medical prior authorization from the first requirement check to the auth number on the claim, so services are approved before they are delivered. It runs as part of our medical billing services or on its own.
When a payer requires approval and the claim arrives without it, the result is usually a CO-197 denial, which is hard to overturn because the payer's position is that the service was never approved. Insurance authorization problems tend to fall into a few groups:
- No request was made because nobody checked whether the service needed one.
- The approval covers a different code, provider, location or date range than what was billed.
- The approved visit count ran out before the plan of care ended.
- The approval expired between the request and the date of service.
- The auth number was never entered on the claim.
Traditional Medicare requires prior authorization only for selected services, while Medicare Advantage, Medicaid managed care and commercial plans use it much more widely. Each plan keeps its own list of services that need approval, and those lists change during the year.
What is prior authorization?
Prior authorization is a health plan's approval of a specific service, test, procedure or drug before it is provided. The plan reviews the request against its coverage policy and returns an approval with an authorization number, approved codes or units, and a date range, or a denial with a reason.
Approval is not a promise of payment. The claim can still be denied if the patient's coverage ended, the service billed differs from the one approved, or the plan's other rules are not met, which is why authorization and eligibility checks are done together.
Prior authorization vs pre certification
Many payers use the terms interchangeably. Where a difference is made, precertification usually refers to approval of a planned admission or surgical stay, while prior authorization covers outpatient services, imaging, procedures and drugs. Each payer's provider manual defines the term it uses, and the claim denial looks the same either way.
Referral vs prior authorization
| Aspect | Referral | Prior authorization |
|---|---|---|
| Who issues it | The patient's primary care provider | The health plan or its review vendor |
| What it allows | A visit to a specialist, often for a set number of visits | A specific service, code or drug for set dates or units |
| Common in | HMO, POS and some Medicaid managed care plans | Most plan types, for services on the plan's list |
| Can a service need both? | Yes: a specialist visit may need a referral | and a procedure at that visit may also need approval |
Referral management is part of our authorization work: we confirm the referral is on file with the plan, covers the treating provider and has visits left before each appointment.
How our prior authorization services work: the prior authorization process
Authorization is pre-service work: it has to be finished before the appointment or procedure, so our team starts as soon as a visit is scheduled or an order is received.
Our prior auth workflow runs in Fastora's Virtual Assistant phase, alongside scheduling and insurance verification, so authorization status is known before the patient arrives. Requests are made for the provider who will actually render the service, which is one more reason payer enrollment needs to be complete before the schedule fills.
- Identify the requirement: check the payer's current authorization list for the planned service, code and place of service.
- Gather documentation: collect the order, diagnoses, clinical notes and prior treatment history the payer's policy asks for.
- Submit: file the request through the portal, fax line or phone line the plan uses, and record the reference number.
- Follow up: check pending requests until the payer approves, denies or asks for more information, and alert the provider when a peer-to-peer review is offered.
- Record the approval: enter the auth number, approved codes, visit or unit count, and start and end dates in your EHR/PM system.
- Track usage and expiration: count visits against the approval and start renewals before it runs out.
Authorization tracking and expiration dates
Authorization tracking is where many practices lose revenue after doing the hard part. We monitor visits used, visits remaining and end dates for every open approval, and flag renewals early enough for the payer to process them before the next scheduled visit. This authorization management lives in the same system your staff schedule from, so everyone sees the same status.
Turnaround and tracking: how long does prior authorization take?
How long does prior authorization take? It depends on the plan, the service and whether the request is complete. A request with every required record attached can often be decided quickly, while a request missing a note or a prior treatment history may sit pending until the payer asks for more, so most of the time we save comes from sending complete requests the first time.
The CMS prior authorization final rule (CMS-0057-F)
The CMS prior authorization final rule, the Interoperability and Prior Authorization Final Rule (CMS-0057-F), applies to Medicare Advantage organizations, Medicaid and CHIP programs and managed care plans, and Qualified Health Plan issuers on the federal exchanges. Starting in 2026, these payers must generally send decisions within 72 hours for expedited requests and seven calendar days for standard requests, and give a specific reason when they deny one. The rule also requires these payers to build a prior authorization API, with most API requirements starting in January 2027.
The rule does not cover every plan. Self-funded employer plans and many commercial products follow their own timelines, and state laws, such as the Texas Insurance Code for state-regulated HMOs and PPOs, set separate decision deadlines. We track each pending request against the timeline that applies to that plan.
Peer-to-peer reviews
When a payer's reviewer is inclined to deny, many plans offer the ordering provider a peer-to-peer call with a physician reviewer. We alert the provider as soon as the offer arrives, prepare a short summary of the clinical facts and the policy criteria, and record the outcome. If the denial stands, the case moves to an appeal with our denial management team.
Authorizations we manage: specialty rules for medical prior authorization
Authorization rules vary by specialty as much as by payer. These are the requests we handle most often.
Prior authorization for MRI and other imaging
Prior authorization for imaging, such as MRI, CT, PET and nuclear cardiology, is often reviewed by a radiology benefit manager working for the health plan. Prior authorization for MRI is tied to the specific CPT code, body part and contrast option, so if the radiologist changes the study from without contrast to with and without contrast, a new or updated approval may be needed before the scan.
Prior authorization for physical therapy
Many commercial and Medicare Advantage plans approve a set number of visits or a date range after the initial evaluation and need updated progress notes to extend it. Traditional Medicare does not use prior authorization for outpatient therapy, but it does require a certified plan of care and the KX modifier above the annual threshold. Our PT billing team tracks visits against each approval.
Prior authorization for mental health
Prior authorization for mental health services is common for intensive outpatient programs, partial hospitalization, psychological testing, TMS and some medications, and some plans review routine therapy after an initial set of sessions. Prior authorization for behavioral health may sit with a carve-out administrator rather than the medical plan. Under the federal Mental Health Parity and Addiction Equity Act, plans that cover these benefits generally may not apply prior authorization to them more strictly than to comparable medical benefits. Behavioral health authorization patterns are covered on our behavioral health billing page.
Prior authorization for pain management and surgery
Epidural steroid injections, facet procedures, spinal cord stimulator trials and orthopedic surgery often require documented conservative treatment before approval, and repeat procedures face frequency limits. We collect the treatment history the payer's policy asks for before submitting.
Texas gold-card rules
Texas House Bill 3459, passed in 2021, created preauthorization exemptions, often called gold cards. A state-regulated HMO or PPO must exempt a physician or provider from preauthorization for a particular service if the plan approved at least 90 percent of that provider's requests for the service during the evaluation period. The program's rules have been revisited since it began, so check the Texas Department of Insurance's current guidance for the evaluation period and process.
Three practical points matter for billing. An exemption is service by service, not a blanket pass. It applies only to plans regulated by the Texas Department of Insurance, so self-funded employer plans, Medicare and Medicaid follow their own rules. And a plan can rescind an exemption after reviewing claims, so documentation still needs to support every service. Our article on the Texas gold card program covers the details.
We record which exemptions each provider holds, with the plan and service, so requests are not sent when they are not needed and are sent when an exemption ends.
Retro authorization: when payers allow it
Retro authorization is a request for approval after the service has already been provided. Payers differ widely: many do not allow it for scheduled services, and those that do usually limit it to specific situations, such as urgent care or retroactive coverage the practice could not have known about, and to a short window after the visit.
Because the outcome is uncertain, a retro request is a fallback, not a plan. When a visit happens without a required approval, we check that payer's policy right away, file a retro request where one is allowed, and otherwise prepare the case for an appeal or for your financial policy with the patient.
Eligibility verification vs prior authorization
The two checks answer different questions, and a patient can pass one and still fail the other.
| Aspect | Eligibility verification | Prior authorization |
|---|---|---|
| Question answered | Is the patient covered, and what are the benefits? | Has the payer approved this specific service? |
| When | Before every visit | Before services on the payer's authorization list |
| Result | Coverage status, copay, deductible, coinsurance and visit limits | An authorization number with approved codes, units and dates |
| If missed | Eligibility or coverage denial | Authorization denial |
We run both. Eligibility and benefits checks flag authorization requirements during the benefits call, and that flag starts the authorization request.
Prior authorization outsourcing: working with a prior authorization company
Choosing a prior authorization company comes down to follow-through. Prior authorization outsourcing gives your staff back the hours spent on hold and on portals, but only if requests are complete, tracked and recorded where your team can see them.
Fastora's pre authorization services include prior authorization support through a dedicated account contact, work inside your existing EHR/PM system with no software to install, and keep every authorization record next to the schedule. Every workflow is aligned with HIPAA and HITECH, with encryption, secure server environments, strict access controls and regular internal audits, and we sign a Business Associate Agreement before accessing PHI.
Fees are quoted after a free billing assessment of your current authorization volume and denials. You can review how our pricing models work beforehand.
Referral-to-Authorization Continuity
Prior authorization does not start with a form — it starts with the referral. When referral intake and authorization work live in separate silos, practices lose referrals in the handoff: authorizations are requested late, documentation is incomplete, and patients wait without knowing why. Continuity means treating the referral and the authorization as one workflow from the first phone call.
It begins at intake. The front desk collects not just the patient’s name and insurance, but the reason for referral, the referring provider’s details, the requested service, and any deadlines attached to the request. That information is linked to the authorization request from the start, so the back office never has to re-verify what the front desk already captured. A referral that arrives without its clinical context stalls; one that arrives complete moves.
Authorization expiry tracking is the other half of continuity. Authorizations carry visit counts and end dates, and a practice that does not watch them ends up with expired approvals, interrupted care, and re-authorization requests that start from zero. Tracking expiry alongside the referral keeps sessions continuous and gives the front office time to act before a gap appears.
- Linked records: each authorization tied to its originating referral, provider, and payer
- Expiry alerts: visit counts and end dates monitored before they lapse
- Clean handoffs: front-desk intake notes flow directly into back-office auth work
- Patient visibility: the office can tell a patient where their request stands without digging
Frequently Asked Questions
How do I choose a prior authorization company?
Start with scope. Full-service prior authorization covers the entire chain: verifying benefits, gathering clinical documentation, submitting the request, following up with the payer, handling peer-to-peer reviews, tracking approvals and expirations, and re-authorizing ongoing care. If a company only handles part of this — say, submission without follow-up — ask who owns the rest and how handoffs are documented.
Ask about turnaround in terms of process, not promises. Reasonable questions include: how quickly do they start work after receiving a referral, how do they prioritize urgent versus routine requests, and how do they communicate status to your office. Be cautious of any vendor that guarantees specific turnaround times without knowing your specialty, payer mix, or volume — authorization timelines are set by payers, not vendors.
Watch for red flags on the sales call. Pressure to sign before they’ve reviewed your actual workflows, vague answers about who does the work and where, reluctance to explain how they handle denials and peer-to-peer reviews, and pricing that shifts once implementation begins are all reasons to pause.
Weigh in-house against outsourced staffing honestly. In-house teams give you direct control and proximity to patients, but they struggle with coverage during turnover, vacations, and volume spikes. Outsourced partners provide continuity and scale, but you need clear service-level expectations, named contacts, and transparent reporting. Some practices split the difference: front-desk intake stays in-house while back-office submission and follow-up are outsourced.
For therapy and behavioral health practices, confirm the vendor handles visit-limit tracking and concurrent review — the two areas where mental health authorizations differ most from procedural authorizations. If they cannot explain how they monitor remaining sessions or manage ongoing medical-necessity reviews, they may not be equipped for your practice.
Prior authorization documentation for behavioral health
Behavioral health prior authorization lives or dies on the packet. The authorization documentation typically includes the treatment plan, session notes showing medical necessity, prior treatment history and the specific codes and visit counts requested. For ongoing care, concurrent review asks for updated notes before more visits are approved — a request that stalls when the documentation is thin. We assemble the packet from your EHR, submit through the right portal (including carve-out administrators) and track the visit count against the approval so the claim carries the auth number.
Background: behavioral health prior authorization documentation. When an authorization denial still happens, our prior authorization denials guide walks through the response.
Pre-authorization services from a dedicated prior authorization company
Pre-authorization services cover the full authorization lifecycle: checking requirements before the order, submitting with the clinical documentation attached, tracking the decision and handling renewals before they lapse. A dedicated prior authorization company runs this as a daily queue, not a side task — which matters because authorizations expire, requirements change and a single missed renewal becomes a denied claim. The team also handles peer-to-peer scheduling and the documentation the reviewer asks for, so the provider time is protected.
Authorization rules are not the same everywhere. Texas practices, for example, work under the state gold-card program rules for qualifying providers — our Texas gold-card guide explains the exemption — and every payer has its own portal, forms and turnaround expectations. Background: Texas gold-card guide; when an authorization denial still happens, our prior authorization denials guide walks through the response.
Authorizations are one part of the revenue cycle, not the whole thing. See our medical billing services page and denial management for the rest.