Why Did My Child's Prior Authorization Get Denied?

A denial letter is one of the most upsetting pieces of mail a parent can receive. Your child needs care. Their doctor recommended it. And the insurance company just said no. I've watched parents read these letters and feel like the whole system has decided their child doesn't matter. So let me give you the real reasons denials happen, because almost none of them have anything to do with whether your child deserves care.

The most common reasons for denial:

The number one cause of pediatric prior authorization denials, by a wide margin, is missing or incomplete clinical documentation. The insurance company didn't deny your child — they denied a paperwork submission that didn't include enough information for them to approve it. This is so common that the majority of denials I've seen across my career fall into this category. The fix is usually to resubmit with the missing pieces.

The second most common reason is medical necessity criteria mismatch. Every insurance company has internal criteria for what they consider medically necessary for each diagnosis. If the submission doesn't explicitly show how your child's situation meets their criteria, they deny. This is particularly common with brand-name medications when a generic exists, with advanced imaging when basic imaging hasn't been tried first, and with therapies when an initial evaluation hasn't been documented.

The third reason is a step therapy or “fail first” requirement. Many insurance plans require that cheaper or older treatments be tried before they'll approve newer or more expensive ones, even if the doctor thinks the newer one is clearly the right choice. This applies a lot to asthma medications, ADHD medications, and biologics.

The fourth reason is benefit exclusion. Sometimes the service simply isn't covered under your specific plan. This is different from a clinical denial — it's a contract issue. Common examples include orthodontia, certain developmental therapies that the plan classifies as educational rather than medical, and some genetic testing.

The fifth reason is administrative error. The wrong CPT code was used. The diagnosis code didn't match. The doctor's NPI wasn't on the form. The date of birth was off by a digit. These denials are frustrating because they have nothing to do with your child's actual care, but they happen constantly.

What the denial letter actually tells you:

Every denial letter is required to include a reason for the denial and information about your appeal rights. The reason is usually stated in short, jargon-heavy language. “Not medically necessary.” “Service not covered.” “Documentation insufficient to support medical necessity.” “Step therapy criteria not met.”

Read the reason carefully. Then call the insurance company and ask for a plain-English explanation of what they would need to approve the request. They are required to tell you. Often the answer is something specific and fixable.

What to do next:

Don't accept the denial at face value. The majority of pediatric prior authorization denials that get appealed end up being overturned, especially when the appeal includes the right documentation. I'll cover the appeal process in detail in another post, but the short version is: you have the right to appeal, your child's doctor has the right to request a peer-to-peer review, and you have the right to an external independent review if the internal appeal fails.

Also call the doctor's office and let them know about the denial. Many denials get resolved before they ever reach the appeal stage simply because the practice resubmits with additional information. If your pediatric practice is buried in prior authorization work and isn't catching denials quickly, that's a sign their authorization workflow needs help. Precision Pediatric Operations was built specifically to manage the full authorization lifecycle for pediatric practices, including denial resolution, so that requests don't fall through the cracks.

Examples of how each denial reason actually looks:

To make this less abstract, here's what each denial type tends to look like in real pediatric cases. A documentation denial often happens when the doctor's office submits a request for ADHD medication and the carrier wants behavioral rating scale scores or evidence of a multidisciplinary evaluation that wasn't attached. A medical necessity denial often looks like a biologic denial that says “criteria for severe asthma not documented” even though the child has clearly failed multiple inhaled controllers. A step therapy denial often hits when the doctor wants a long-acting stimulant and the plan requires the child to try a short-acting one first. A benefit exclusion often shows up with sensory integration therapy that the plan classifies as educational. An administrative denial often appears as a single-line letter saying the procedure code didn't match the diagnosis code, which is almost always a coding fix at the practice level.

Each of these has a different path forward, and identifying which type of denial you're looking at is the first step in knowing what to do next.

Your child's denial is not the final answer. It's a checkpoint, and you have moves to make at every one of them.

Knowing why denials happen is one piece of the puzzle. For the full picture — how prior authorization works from submission through approval, denial, and appeal — read my Complete Guide to Prior Authorization for Pediatric Families.