Living with a rare disease often means navigating a healthcare system that wasn't designed with your complexity in mind — and nowhere is that more painfully obvious than your medical bills. Studies suggest that up to 80% of medical bills contain at least one error, and for patients with rare conditions who receive specialist care, experimental treatments, infusion therapies, or out-of-network services, the stakes are even higher. A single coding mistake can mean thousands of dollars billed incorrectly.
The good news: billing errors can be disputed and corrected — but only if you know what to look for.
Why Rare Disease Patients Are Especially Vulnerable
Rare disease billing is unusually complex for several reasons:
- Rare diagnoses use uncommon ICD-10 codes that some billing staff may enter incorrectly or substitute with a more common — and differently priced — code.
- Specialty medications and infusion therapies are frequently miscoded, billed at the wrong site of service, or duplicated.
- Multi-specialist visits in a single hospital system are sometimes billed as separate facility fees even when they occur on the same day.
- Experimental or off-label treatments may be denied as "not medically necessary" even when they are covered under an exception — an error that looks like a denial but is actually a reviewable claim.
- Out-of-network providers at in-network facilities (like an anesthesiologist or pathologist at an in-network hospital) can trigger balance billing that may be prohibited under the No Surprises Act.
The Documents You Need
Before disputing anything, gather these three documents for every visit or claim:
| Document | Where to Get It | What It Shows |
|---|---|---|
| Explanation of Benefits (EOB) | Your insurance portal or by mail | What your insurer paid, denied, or applied to your deductible |
| Itemized Bill | Request directly from the provider's billing department | Line-by-line list of every charge, including procedure codes |
| Medical Records | Patient portal or a formal records request | What was actually documented and performed |
Compare all three. If your EOB shows a procedure was billed that doesn't appear in your medical records, that is a potential error worth pursuing.
Common Billing Errors to Look For
Wrong procedure code (CPT code): A code transposition or incorrect code can turn a routine infusion into a more expensive procedure. Look up unfamiliar codes at the CMS code lookup.
Upcoding: Your provider billed for a more complex service level than was documented. For example, billing a Level 5 office visit when your records reflect a Level 3.
Duplicate charges: The same service billed more than once, often across multiple claim submissions.
Unbundling: Services that should be billed as a single bundled procedure are billed separately at a higher combined cost.
Wrong date or place of service: A telehealth visit billed as an in-office visit carries a different price and may be covered differently under your plan.
Incorrect patient or insurance information: Even a transposed digit in your member ID can cause a claim to be denied and billed to you.
A Free Tool Built for Situations Like Yours
Reviewing medical bills and claims is time-consuming and technically complex — most people don't know what a CPT code is, let alone whether the one on their bill is correct. That's where MyCareClaim.com can help.
MyCareClaim is a service designed to help patients — particularly those with complex medical histories and unusual billing situations — review their claims for errors. It walks you through your bill in plain language, flags potential discrepancies, and helps you understand what steps to take next.
For rare disease patients who receive regular specialist care, infusion treatments, or high-cost medications, using a service like MyCareClaim can make a meaningful difference in what you actually owe versus what you're billed.
Recommended Tool: MyCareClaim.com — Review your medical bills and claims for errors, with guidance built for patients navigating complex healthcare.
How to Dispute a Billing Error
If you find an error, here's the process:
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Call the provider's billing department first. Many errors are clerical and can be corrected with a phone call. Ask for the billing manager, not the front desk. Document the name of who you spoke to, the date, and what was said.
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Submit a written dispute. Follow up your call with a letter or email that cites the specific line item, the error you believe was made, and the supporting documentation (your medical records, EOB, or itemized bill).
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File an insurance appeal if the denial is the issue. Your EOB will include a denial reason code and instructions for appealing. Rare disease patients have the right to request an external review if your internal appeal is denied.
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Contact your state insurance commissioner if the insurer is unresponsive or if you believe the denial violates your coverage terms.
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Seek a patient advocate. The Patient Advocate Foundation offers free case management services for people with chronic and rare conditions who are disputing medical bills.
Know Your Rights
The No Surprises Act (effective 2022) protects you from unexpected out-of-network bills in many situations, including emergency care and care from out-of-network providers at in-network facilities. If you received a surprise bill that may violate this protection, you can file a complaint with the federal No Surprises Help Desk at 1-800-985-3059.
Your insurer is also required to provide a Summary of Benefits and Coverage (SBC), which specifies exactly what your plan covers. Billing disputes that contradict your SBC carry significant legal weight.
Medical billing is complicated by design — but it is not beyond your ability to navigate. A careful review of your itemized bill, EOB, and medical records, combined with the right tools and a willingness to advocate for yourself, can recover real money and ensure you're only paying for care you actually received.