The Prepared Patient: 10 Steps to Fighting a Medical Bill and Winning
It’s astonishing that approximately 80% of medical bills contain at least one error. When patients formally appeal a denial, a large share of those denials get reversed. Depending on the type of denial, anywhere from a third to more than 80% are overturned. For appealed prior-authorization denials in Medicare Advantage, the overturn rate topped 83%.
And here is the number that costs American families the most money: fewer than 1% of denied claims are ever appealed (KFF).
The system bills the wrong amount constantly, wins by default because almost no one pushes back, and reverses course far more often than people expect once someone does.
Welcome to The Prepared Patient. In my book, I discuss how to appeal denials, challenge refused preauthorizations, and correct bills that were never right to begin with. This is how a prepared patient protects their finances. What follows is the working version: ten steps that apply to any medical money fight, plus two short playbooks for the two situations that are very common.
The two fights
Most disputes fall into one of these buckets:
The insurance company denied, underpaid, or refused to preauthorize something you expected to be covered.
The provider billed you for the wrong amount, a service you never received, or a price far above what is reasonable.
The good news is that the opening moves are the same for both.
The 10 steps to fighting a medical bill
Pause before you pay. A bill is a starting figure, not a final verdict. Paying immediately can forfeit your leverage and make refunds much harder to claw back.
Request an itemized bill. The summary statement hides everything. Ask for the line-by-line version with billing (CPT) codes so you can see what you were actually charged for.
Pull your Explanation of Benefits (EOB) and your policy documents. You should be able to find it on your insurance company’s website too. The EOB from your insurer shows what was billed, what was allowed, what they paid, and what they left to you. Your plan's summary of benefits tells you what was supposed to be covered.
Find the exact reason. Every denial has a stated reason and a code. Read it word for word. Administrative and coding issues carry some of the highest reversal rates because they are simple mistakes, not judgments about your care.
Line up the bill and the EOB side by side. Look for charges that do not match, services you never received, duplicate entries, and a higher-complexity code than the visit warranted (known as upcoding). These are the most common and most winnable errors.
Note every deadline. Internal insurance appeals typically allow up to 180 days from the denial letter. External reviews and provider disputes have their own clocks. Missing a deadline can end a strong case before it starts.
Gather your evidence. Collect medical records, doctor's notes, the original order or referral, and the relevant policy language. A short letter of medical necessity from your physician is one of the strongest documents you can add.
Make the call, then confirm in writing. Phone the insurer or billing office, take notes, and get names and reference numbers. Then follow up in writing so there is a paper trail. Written appeals carry more weight than a phone conversation alone.
Escalate if the first answer is no. A first denial is routine, not the end. There is almost always a next level: a second review, an external appeal, a supervisor, or your state regulator.
Document everything. Date, time, name, and summary for every contact. This record is what turns a “he said, she said” into a case that is hard to dismiss.
Playbook A: Appealing an insurance denial
File a formal internal appeal in writing, inside the deadline. State the claim number, the denial reason, and why it is wrong.
Quote your own policy back to them, along with the specific benefit that covers the service.
Attach a letter of medical necessity from your treating doctor. Appeals backed by a physician's letter succeed far more often than those without.
For a denied preauthorization, ask your ordering physician to request a peer-to-peer review, where your doctor speaks directly with the insurer's reviewer. Many denials fall apart at this stage.
If the internal appeal fails, request an independent external review by a third party. This step is underused, and it works.
Remember the leverage in your favor. Insurers count on you giving up. The data says persistence pays.
Playbook B: Correcting a provider bill (and asking for a discount)
Call the billing office and ask them to explain every disputed line. Make them account for what each charge is for.
Flag duplicate charges, services not rendered, and upcoding in writing, and ask for a corrected bill. Among patients who contacted a billing office about a problem, about 1 in 4 got the bill corrected.
Ask for the cash or prompt-pay price. It is often dramatically lower than the billed rate.
Ask about financial assistance or charity care. Nonprofit hospitals are required to offer it, and many for-profit providers have programs they do not advertise.
Negotiate the balance. Reference fair-price benchmarks (Medicare's allowed rate for the same code is a useful anchor) and request a reduction. Around 1 in 7 patients who ask receive a discount or a payment plan.
Request a no-interest payment plan rather than letting a balance go to collections and get any agreement in writing before you pay a cent.
The prepared patient mindset
The first bill is a draft. The first denial is an opening position. Neither is the final word unless you decide it is.
The families who keep their money are not the ones with the best coverage or the deepest pockets. They are the ones who open the envelope, ask the second question, and put their objection in writing. That is the entire advantage, and it is available to everyone.
Be a Prepared Patient. Your finances will thank you.
The Prepared Patient: Your Guide to Surviving the Health Care System will be released August 11. It is available for preorder from Amazon https://bit.ly/4nCWoDv and Johns Hopkins University Press https://bit.ly/4v9h20e