Lifestyle

6 Things Insurers Count on You Not Doing After They Reject Your Medical Claim

By Mike Harper · August 11, 2026

The denial letter arrives. Most people read it, feel defeated, and pay the bill. That’s exactly what the insurance company is counting on.

Roughly one in five health insurance claims is denied on the first submission. The majority of those denials are never appealed. And among the ones that are, the success rate is striking — studies consistently show that 40% to 60% of appeals result in overturned denials. The insurance company knows this. They’re betting you don’t.

You can demand the specific reason in writing. Denial letters are often vague — “not medically necessary” or “service not covered” without further explanation. Under federal law, your insurer must provide the specific clinical rationale and the plan provision that supports the denial. If the letter doesn’t include this, call and request it. You cannot effectively appeal a denial you don’t fully understand.

You have the right to an internal appeal — and your insurer must process it. Every plan regulated by the ACA is required to offer an internal appeal process. You typically have 180 days from the date of denial to file. The appeal is reviewed by someone who wasn’t involved in the original decision. Submit it in writing, include your doctor’s notes, any supporting medical literature, and a letter from your provider explaining why the service was necessary.

Your doctor can file a peer-to-peer review on your behalf. Most insurers allow your treating physician to speak directly with the insurance company’s medical director to argue the clinical case for coverage. This is one of the most effective tools in the appeals process, and most patients don’t know it exists. Ask your doctor’s office whether they’re willing to initiate a peer-to-peer review — many do this routinely.

If the internal appeal fails, you can request an external review. An external review sends your case to an independent third-party reviewer who has no relationship with your insurance company. The external reviewer’s decision is binding — if they overturn the denial, the insurer must pay. This is a federal right under the ACA, and the external review is typically free to the patient.

“Not medically necessary” is a coverage decision, not a medical opinion. When an insurer denies a claim as “not medically necessary,” they’re applying their own clinical guidelines — which may differ from your doctor’s judgment. Your doctor ordered the test or procedure because they believed it was necessary. The insurance company’s reviewer — who has never examined you — disagreed. That disagreement is exactly what the appeals process is designed to resolve.

Filing a complaint with your state insurance commissioner creates a paper trail. If your appeal is denied and you believe the insurer acted in bad faith, filing a complaint with your state’s department of insurance puts the denial on record. Regulators track complaint patterns and can investigate insurers with unusually high denial or appeal rejection rates. The complaint alone may not reverse your denial, but it contributes to oversight that protects everyone.

The denial letter is not a verdict. It’s an opening position. The patients who appeal recover coverage roughly half the time. The patients who don’t appeal pay the full bill every time. The insurance company’s entire denial strategy is built on the assumption that you won’t fight back.