Insurance systems weren’t built with ultra-rare, progressive diseases in mind, and the criteria used to approve or deny coverage often don’t reflect the reality of a condition like Niemann-Pick disease — where the goal isn’t recovery, it’s maintaining function and quality of life. For many families, that means hearing “no” more than they should, and spending time and energy fighting decisions that shouldn’t have gone that way in the first place.

What we know from families who have been through it is that having the right language and knowing the right next steps can shift outcomes. You’ll find guidance on understanding how coverage decisions get made, navigating denials, appealing decisions, and communicating with insurers in ways that move things forward. That includes framing that tends to work for degenerative conditions and templates you can adapt for your own situation.

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Use this list to jump to the right section for your journey

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One important note: insurance coverage, benefits eligibility, and appeals processes vary by state, plan type, and diagnosis. The guidance here is a starting point. Your NNPDF family support contact can help you navigate what applies in your specific situation.

Maintenance vs. Improvement Language

Understanding how coverage decisions get made

When an insurance company reviews a claim, it’s looking at documentation from your medical team — such as specialist reports, clinical notes, therapy evaluation, letters of medical necessity — and using that information to determine whether a treatment or service meets their definition of “medically necessary.” What most families don’t realize is that the language used in those documents can matter as much as the clinical facts they’re describing.

Most insurance systems are built around an improvement standard: the idea that treatments should move patients towards better outcomes, and once that improvement stops, coverage stops too. For a progressive disease like Niemann-Pick, that standard doesn’t fit. The goal of most treatments isn’t improvement — it’s maintenance. Maintaining function, slowing decline, and preserving abilities your child or family member has worked hard to keep is a successful clinical outcome. But an insurance reviewer applying a standard framework may not read it that way. This is one of the most common reasons families with Niemann-PIck face denials.

The table below shows phrases that are common in medical documentation — and not inaccurate — but may still cause issues with coverage or trigger a denial. Sharing these examples of alternative language with your medical team before documentation is written may help the process:

Phrases that may trigger denials	Language to use instead
“No significant improvement or decline”	“Ongoing intervention is medically necessary to preserve existing function and prevent decline”
“Maintaining current abilities”	"Patient has maintained current level of function, which represents a clinically significant outcome in the context of a progressive disease”
“Patient has reached maximum benefit”	“Without ongoing intervention, decline is expected given the progressive nature of the disease”

Magic Words

Beyond documentation language, there are certain words and phrases that can trigger processes or shift outcomes when you’re communicating with an insurer.

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“Ultra-rare disease” More precise and impactful than “rare.” With fewer than 1 in 50,000 people affected, this language signals that standard frameworks may not apply and that specialist expertise is required to evaluate the case.
“Progressive” and “degenerative” Using these words consistently across documentation, letters, and calls, reinforces the case for maintenance coverage being medically necessary, and pushes back against any assumption that treatment is optional.
“Compassionate Allowances condition” This signals that the diagnosis qualifies for expedited processes and carries weight beyond the disability benefits context where it originated.
“Expedited appeal” Signals urgency and triggers a legally binding 72-hour response timeline.
“External review” Invoking your legal right to an independent third-party review if an internal appeal is denied. Mentioning this in an appeal letter sometimes prompts reconsideration before it gets that far.

“Peer to peer review” Requests a direct call between your doctor and the insurer's medical reviewer. This can resolve denials faster than a written appeal and is worth asking for early.

“State insurance commissioner” Stating your intention to file a complaint with your state’s insurance commissioner can accelerate a response or prompt an insurer to reconsider a decision. </aside>

When You Receive a Denial

With a progressive disease, a denial isn’t just frustrating — it slows things down when time matters. But it’s worth knowing that a denial is not a final answer, and can often successfully be overturned. The families who tend to have the best outcomes are the ones who respond quickly, document carefully, and know what to ask for. Make sure to ask for a copy of the denial and keep your own records.

The first thing to do when you receive a denial is identify the reason. Your denial letter is required to include it. Common reasons include:

Not medically necessary: The reviewer determined that the treatment or service doesn't meet their definition of medical necessity. This is the most common reason for denial — and the most commonly overturned on appeal.