Your doctor’s office handles the prior authorization process, but understanding each step helps you avoid delays and push things forward when needed. Prior authorization is your insurance company’s way of approving certain treatments, medications, or equipment before they’ll agree to cover the cost. The process typically takes anywhere from a few hours to 30 days depending on your plan, the request type, and whether your provider submits complete documentation upfront.
What Triggers a Prior Authorization
Not every prescription or procedure requires prior authorization. Insurers typically flag services they consider high-cost, specialized, or prone to overuse. Common categories include:
- Specialty medications: biologics, cancer drugs, and newer brand-name prescriptions that have cheaper alternatives
- Advanced imaging: MRIs, CT scans, and PET scans
- Surgical procedures: joint replacements, spinal surgeries, and bariatric procedures
- Durable medical equipment: power wheelchairs, motorized scooters, pressure-reducing mattresses, and prosthetic limbs with advanced features like microprocessor-controlled joints
- Mental health and substance abuse treatment: inpatient stays, intensive outpatient programs, and residential facilities
Your insurance plan’s formulary or benefits documents will list exactly which services require prior authorization. If you’re unsure, call the member services number on your insurance card before scheduling anything.
How the Process Works, Step by Step
Your doctor’s office initiates the request. You don’t submit it yourself, but you can (and should) stay involved to make sure nothing stalls.
Step 1: Your provider submits the request. After determining you need a specific treatment, your doctor’s office sends a prior authorization request to your insurer. This includes a clinical justification explaining why the treatment is necessary for you specifically. Depending on the situation, they may need to document other treatments you’ve already tried, medications that failed or caused side effects, and why this particular option is the right next step.
Step 2: Your provider gathers supporting documentation. The insurer wants proof that the request is medically necessary. That means your provider needs to submit relevant chart notes, lab results, imaging results like MRIs or X-rays, and any records showing your treatment history. All of this information must be verifiable in your medical record, so make sure your provider has your complete history, especially if you’ve seen specialists at other practices.
Step 3: The insurer reviews the request. A clinical team at your insurance company evaluates the documentation against their internal medical policies. They may approve, deny, or request additional information. In some cases, this review can take up to 30 days for a standard request.
Step 4: You and your provider receive a decision in writing. The insurer sends their decision to both you and your doctor. If approved, the authorization typically comes with a validity window, meaning you need to schedule the service within a certain timeframe or the approval expires.
How Long It Takes
Timelines vary by plan type and urgency. For standard requests, most insurance plans take 7 to 30 days to issue a decision. Federal rules for Medicaid and marketplace plans set specific limits: 7 calendar days for standard requests involving services and procedures, and 24 hours for prescription drug requests.
If your doctor determines that waiting could seriously harm your health, they can file an expedited (urgent) request. Expedited requests must be resolved within 72 hours for most plan types, and within 24 hours for urgent drug requests. Your provider makes this call based on your medical situation, so if you feel your case is time-sensitive, tell them directly.
Electronic prior authorization systems have dramatically shortened these waits. A study covering over 50 million Americans found that when insurers used electronic processing, the median decision time dropped from about 19 hours to under 6 hours. Roughly 43% of electronic requests were processed automatically without any manual review, and 62% received a determination within two hours.
What You Can Do to Speed Things Up
Even though your doctor’s office runs the process, you have more influence than you might think. The biggest cause of delays is incomplete documentation. Ask your provider’s office directly whether they’ve submitted the request and whether they included all supporting records. If you’ve seen other specialists, had lab work done elsewhere, or tried treatments at a different practice, make sure those records are available to the submitting provider.
Call your insurance company a few days after the request is submitted to confirm they received it and ask if anything is missing. Requests that sit in a queue because the insurer needs more information can stall for weeks without anyone noticing. A single phone call can catch this early.
Keep a written log of every call you make: the date, the representative’s name, and what they told you. If the process drags on or results in a denial, this record becomes valuable during an appeal.
Why Requests Get Denied
The most common reason for denial is that the insurer doesn’t consider the treatment “medically necessary” based on their internal guidelines. This doesn’t mean your doctor was wrong. It means the documentation didn’t meet the specific criteria the insurer uses, which can differ from standard medical practice.
Other frequent reasons include:
- Incomplete information: missing lab results, imaging, or treatment history that the insurer needed to make a decision
- Step therapy not completed: the insurer requires you to try cheaper or more conservative treatments first before approving the requested one
- Out-of-network provider: the service was requested from a provider outside your plan’s network
- Setting of care disputes: the insurer believes the treatment could be done in a less expensive setting, such as at home instead of in a hospital
Electronic systems have cut denials caused by missing information by 68%, but paper-based and fax-based submissions still account for a large share of preventable rejections.
How to Appeal a Denial
A denial is not the end. You have two levels of appeal available, and using them is worth the effort.
An internal appeal goes back to your insurance company. You’re asking them to take a second, more thorough look at the request. File this as soon as possible after receiving the denial letter, which will include instructions and a deadline (usually 30 to 60 days). Your doctor can submit additional clinical evidence at this stage, so coordinate with them. For urgent cases, the insurer must expedite the internal review.
If the internal appeal is also denied, you have the right to an external review. This sends your case to an independent third party, not your insurance company, who evaluates whether the denial was justified. The external reviewer’s decision is binding on the insurer. This is a powerful tool, and it’s free to you.
When preparing an appeal, focus on demonstrating medical necessity. Include any documentation that wasn’t part of the original request: new test results, a letter from your specialist explaining why alternatives aren’t appropriate, or evidence that you’ve already tried and failed the treatments the insurer suggested. Washington State’s Office of the Insurance Commissioner notes that showing a lack of in-network providers within 30 miles, or long wait times for in-network appointments, can also support appeals for out-of-network denials.
If Your Plan Uses Electronic Authorization
More insurers are adopting electronic prior authorization systems, and if yours has, the process is noticeably faster. Providers submit requests through integrated software rather than faxing forms, which reduces errors and eliminates the back-and-forth over missing paperwork. Plans using these systems saw unnecessary submissions drop from 40% to 16%, and appeals fell by 88%. About 71% of providers reported that patients received care faster after the switch.
You can ask your doctor’s office whether they submit prior authorizations electronically to your insurer. If they do, expect a decision in hours rather than days for straightforward requests. If they still use fax or phone, the process will take longer, and the risk of administrative errors goes up.