What is Prior Authorization? How Does it Work?

You often hear these words “sorry, the insurance company doesn’t cover the service you delivered” or might be “you need to ask the patient to pay (which you ain’t allowed to do in some states) because the payer doesn’t agree to pay for treatment”. If yes, you’re not alone, because it often happens with providers — who end up absorbing that cost, which hurts their practices’ growth.

That’s where prior authorization takes place. It’s an approval that can save your practice thousands of dollars — helping you grow while building a healthy relationship with patients. Let’s get to know about “what does prior authorization mean” in detail, and how you can avoid delays due to pre-approval requests.

What is Pre-Authorization in Medical Billing?

In medical billing, prior authorization is a process of getting approval from health insurance companies for certain services before treating patients. It could be the prescription, drugs, medications or high cost of treatments. The process is also known as a pre-authorization, pre-approval or pre-certification.

If the doctor or healthcare provider fails to obtain pre-approval for a service before delivering it to the patient, and the patient’s health insurance plan does not cover it, a denial occurs. It means you lose the money, no matter how much effort you put in or how accurate the claim is. That’s the reason you should always know how prior authorization works, so you’ll never fail to get reimbursed for what’s already yours.

How Does a Prior Authorization Work?

The prior authorization process follows a structured, clear set of steps that help practices obtain pre-approvals from insurers before services are delivered.

Doctor Suggests Treatment

The process begins when the patient visits a clinic or hospital for a specific service, and the facility provider suggests a treatment, medication, or diagnostic test. If the required service requires prior authorization, the process proceeds; otherwise, the doctor treats the patient with care and submits the claims.

Billing Team Request for Pre-Approval

If the treatment or service, such as MRI, CT scans, or high-cost cardiology services, requires a PA number, the billing team begins the pre-approval request. The provider or billing department of the practice submits the request to payers by attaching the procedural (CPT) and diagnosis (ICD-10) codes, medical necessity, supporting medical records, and patient details.

Insurance Company Review the Request

Once the billing team submits the request, the insurance company begins to review it. They check for medical necessity, patient details, history and medical records to ensure that the patient needs the treatment. Further, they assess whether the service is cost-effective or if an alternative medication option is available.

Decision is Made

After assessing the documents, the insurance company makes a decision. Either they approve the request and provide a prior authorization number, or they reject it for any reason (such as not being covered by the plan). It can also happen that they hold the request and ask for more information. Once they decide, both the provider and the patient are notified so they can take the next step.

Appeal Process Begins (If Denied)

If the insurer rejects the request, the appeal process begins. The doctor or medical practice may submit additional documentation or request a peer-to-peer review.

Service is Performed & Claim is Submitted

Once the health insurance prior authorization request gets approved, then the service is performed. After that, the medical billing process begins, including eligibility checks, medical coding , claim scrubbing, and submission within the specified timeframe, which helps get paid on time.

Why Does Insurance Companies Require Prior Authorizations?

The health insurance companies require prior authorization for various purposes. Some of them include;

They verify whether the treatment/service is medically necessary for the patient. It helps them control costs on healthcare facilities and avoid waste of money.
Secondly, it helps manage clinical guidelines for patients, as pre-approval records provide evidence for prescribed medicines, supporting patient health and well-being.
As many medications and procedures are expensive, there is a high risk of fraud. By requesting approvals, they prevent fraud and avoid unnecessary or repetitive care.

Will Medicare Require Prior Authorization in 2026?

Yes, as of January 1, 2026, the Medicare plans revised their prior authorization requirements for certain services in six states. It includes Arizona, Washington, Texas, New Jersey, Ohio, and Oklahoma. By requesting approvals for certain procedures and treatments, Medicare health insurance plans prevent fraud, ensure that services are medically necessary, and build a healthy relationship between patients and providers.

Here’s a list of services that require pre-approval in 2026, organized by health plan category.

Medicare Prior Authorization Services (2026 – Consolidated)

Category	Service / Procedure	Examples / Codes	Scope	PA Required in 2026
DMEPOS	Orthoses (Braces)	L0651, L1844, L1932	Nationwide	Yes
DMEPOS	Pneumatic Compression Devices	E0651, E0652	Nationwide	Yes
DMEPOS	Power Mobility Devices	K0800–K0864	Nationwide	Yes
DMEPOS	Pressure-Reducing Surfaces	E0193, E0277	Nationwide	Yes
DMEPOS	Lower Limb Prosthetics	L5856–L5987	Nationwide	Yes
OPD Services	Blepharoplasty	Eyelid surgery	Nationwide	Yes
OPD Services	Botulinum Toxin Injections	Botox (medical use)	Nationwide	Yes
OPD Services	Rhinoplasty	Nose surgery	Nationwide	Yes
OPD Services	Panniculectomy	Skin removal	Nationwide	Yes
OPD Services	Vein Ablation	Varicose vein treatment	Nationwide	Yes
OPD Services	Spinal Neurostimulators	CPT 63650	Nationwide	Yes
Pilot Program (Traditional Medicare)	Orthopedic Procedures	Joint-related surgeries	Limited States	Yes (Pilot Only)
Pilot Program (Traditional Medicare)	Neurological Procedures	Spine treatments	Limited States	Yes (Pilot Only)
Pilot Program (Traditional Medicare)	Dermatologic Procedures	Skin surgeries	Limited States	Yes (Pilot Only)
Pilot Program (Traditional Medicare)	High-Cost Outpatient Services	~17 selected services	Limited States	Yes (Pilot Only)
CMS Master List	High-Risk / High-Cost Items	Varies annually	Nationwide	Potential Future

How Long Can a Prior Authorization Last?

It depends on the health insurance plans; however, prior authorization often lasts between 6 and 12 months. Although for some chronic care services, it may last longer. Further, the PA validity isn’t fixed or open-ended; if it expires, you need to take approval again.

Service Type	Usual Duration
Diagnostic Tests (MRI, CT, etc.)	30 – 60 days
Outpatient Procedures	30 – 90 days
Medications (especially specialty drugs)	6 – 12 months
Durable Medical Equipment (DME)	3 – 12 months
Therapy Services (PT, Behavioral Health)	30 – 90 days

How Providers Can Speed Up the Pre-Authorization Process?

The healthcare billing process can take time due to several steps, and when you’re handling clinical and administrative operations alone, it can be stressful. If you forgot to obtain approval before delivering services, denials will occur.

To speed up the prior-authorization process, you can outsource medical billing services to a specialized RCM company, which knows how to get approval quickly and accurately. Here are the steps you should take to streamline the prior-authorization process.

Adapt Technology & Automation

In 2026, payers will use AI in medical billing to automate the process, helping them detect minor issues in claims that could lead to rejection. So, why shouldn’t you? Modern medical billing companies are now adopting technology, such as medical billing software, that helps them submit prior-authorization requests in real time. It eliminates manual work, automates the process, reduces errors, and improves the clean claim ratio.

Assign Specialized Team

Prior authorization is a complete process that requires accuracy and must be submitted on time to get approval from insurance companies. So, assign a specialized team or a dedicated manager who can handle all prior requests, track deadlines and manage complex cases — ensure a smooth process.

Stay Updated With Insurance Current Policies

Insurance health policies, plans and coverage benefits change frequently, almost yearly. So, make sure your billing team stays up to date on coverage plans, so they have a better idea of whether the insurance covers the amount or the patient needs to pay out-of-pocket costs — strengthen the provider-patient relationship.

Frequently Asked Questions

What does prior authorization mean?

Prior authorization is when a healthcare provider must get approval from the insurance company before delivering a service or prescribing a treatment. It confirms that the service is medically necessary and eligible for coverage—otherwise, the patient may have to pay out of pocket.

How to get prior authorization approved?

To get a prior authorization approved:

Submit accurate patient and insurance details
Include correct CPT/HCPCS & ICD-10 codes
Attach complete clinical documentation (notes, reports, history)
Follow the payer’s specific guidelines

The more complete and accurate the submission, the higher the chances of approval and the faster the turnaround.

How long does prior authorization take?

It depends on urgency and the insurance company:

Urgent requests: 24–72 hours
Standard requests: 3–7 business days

Some complex cases may take longer if additional information is required.

Why do insurance companies require prior authorization?

Insurance companies use prior authorization to:

Ensure the treatment is medically necessary
Avoid unnecessary or duplicate services
Control healthcare costs
Encourage the use of cost-effective alternatives

What is preauthorization in medical billing?

Preauthorization (also called prior authorization) is a verification step completed before services are provided. In medical billing, it helps ensure:

The service is covered by insurance.
The claim is less likely to be denied later.

What is prior authorization for a prescription?

For prescriptions, prior authorization is required when:

The medication is expensive or specialty-based.
There are safer or cheaper alternatives available.
The drug has usage restrictions.

The provider must justify why that specific medication is needed before insurance agrees to cover it.

How does a prior authorization work?

Here’s the simple flow:

The doctor recommends a treatment or medication.
Provider submits a request to the insurance company.
Insurance reviews medical necessity.
Decision is issued: approved, denied, or pending.
If approved → treatment proceeds.
If denied → appeal or alternative option.

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