How much money do patients lose by not appealing insurance denials?

Tens of billions of dollars annually. Kaiser Family Foundation research estimates that ACA marketplace insurers denied approximately 17% of in-network claims in 2021, with fewer than 0.2% of denied claims resulting in appeals. Given that appeals succeed in 40% to 60% of cases when filed, the vast majority of overturnable denials are never challenged — representing billions in legitimate claims patients abandon each year.

What is the most effective first step when you get a denial?

Read the denial code. The specific code on your Explanation of Benefits (CO-50, CO-16, CO-197, etc.) tells you exactly what the insurer is objecting to — and determines your entire appeal strategy. A CO-50 denial needs clinical documentation; a CO-16 needs a corrected claim; a CO-197 needs authorization proof. Starting without understanding the denial code wastes time and often misses the actual issue.

Does appealing a denial hurt your relationship with your insurer or doctor?

No. You have a federally guaranteed right to appeal under the ACA and ERISA. Insurers cannot retaliate against members for exercising appeal rights. Providers file appeals routinely — it is a standard part of medical billing. There is no record kept of appeals that follows you to new plans, and filing an appeal does not affect your future coverage eligibility.

Is it worth appealing a small dollar claim?

Often yes — for two reasons. First, a small claim denial today may be the first of many for the same service. Establishing the clinical record and getting a reversal on appeal creates precedent for future claims. Second, if the denial is a billing error (CO-4, CO-16), the fix is simple and quick. ClaimCompass analyzes the denial for free and tells you whether the case is strong before you invest time in an appeal.

How much money do patients lose by not appealing insurance denials?

Tens of billions of dollars annually. Kaiser Family Foundation research estimates that ACA marketplace insurers denied approximately 17% of in-network claims in 2021, with fewer than 0.2% of denied claims resulting in appeals. Given that appeals succeed in 40% to 60% of cases when filed, the vast majority of overturnable denials are never challenged — representing billions in legitimate claims patients abandon each year.

What is the most effective first step when you get a denial?

Read the denial code. The specific code on your Explanation of Benefits (CO-50, CO-16, CO-197, etc.) tells you exactly what the insurer is objecting to — and determines your entire appeal strategy. A CO-50 denial needs clinical documentation; a CO-16 needs a corrected claim; a CO-197 needs authorization proof. Starting without understanding the denial code wastes time and often misses the actual issue.

Does appealing a denial hurt your relationship with your insurer or doctor?

No. You have a federally guaranteed right to appeal under the ACA and ERISA. Insurers cannot retaliate against members for exercising appeal rights. Providers file appeals routinely — it is a standard part of medical billing. There is no record kept of appeals that follows you to new plans, and filing an appeal does not affect your future coverage eligibility.

Is it worth appealing a small dollar claim?

Often yes — for two reasons. First, a small claim denial today may be the first of many for the same service. Establishing the clinical record and getting a reversal on appeal creates precedent for future claims. Second, if the denial is a billing error (CO-4, CO-16), the fix is simple and quick. ClaimCompass analyzes the denial for free and tells you whether the case is strong before you invest time in an appeal.

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3 min read · ClaimCompass guide

How Many People Give Up on Legitimate Appeals — and What It Costs Them

Fewer than 0.1% of denied claims are appealed — yet most would have won. Here is what giving up actually costs.

The Giving-Up Gap

There is a staggering gap between the number of Americans who receive insurance denials and the number who appeal them. This gap is not accidental. It is the financial foundation of the denial-first insurance model.

Understanding the scale of the problem — and the personal cost of giving up — is the first step to not becoming part of the statistic.

The Numbers

Health insurance denials

A 2023 Kaiser Family Foundation analysis found that ACA marketplace insurers denied approximately 17% of in-network claims. With over 200 million Americans enrolled in private health insurance, tens of millions of claims are denied each year.

The appeal gap

Despite this, fewer than 1 in 1,000enrollees filed a formal internal appeal in the studied plans. That means approximately 99.9% of denied claims were never formally challenged.

Success rates for those who did appeal

Among those who filed internal appeals, approximately 40–60% were decided in the consumer's favor.

The math: millions of Americans give up on claims they would have won.

The Personal Cost of Giving Up

The average denied health insurance claim

The average denied medical claim involves hundreds to thousands of dollars in out-of-pocket costs that should have been covered. For specialty drugs, surgical procedures, and inpatient care, denied claims frequently involve tens of thousands of dollars.

VA benefits

Veterans who give up on incorrect rating decisions leave potentially hundreds of thousands of dollars in lifetime compensation on the table. A veteran who should receive 70% disability instead of 20% — and gives up — loses thousands of dollars per month for the rest of their life.

Social Security disability

The average Social Security disability claimant who gives up after initial denial and never appeals has forgone monthly income for life. At $1,500/month over 20 years, that is$360,000 in foregone benefits.

Unemployment

A person who accepts a wrongful unemployment denial loses an average of $450/week for up to 26 weeks — nearly$12,000 in benefits they were entitled to receive.

Why People Give Up

Confusion

The appeals process is deliberately complex. Bureaucratic language, multiple forms, and unclear instructions discourage people from starting.

Fear of the unknown

Many people don't know what an appeal involves, how long it takes, or whether they need a lawyer. The uncertainty feels overwhelming.

Exhaustion

When you are dealing with a medical crisis, a disability, or financial pressure, fighting an insurance company feels like one more impossible task.

Disbelief that it will work

People assume the system is rigged and their appeal has no chance. The data shows otherwise.

Frequently Asked Questions

What percentage of insurance denials are appealed?

Studies consistently show that fewer than 1 in 10 people who receive a denial file a formal appeal — some estimates put the appeal rate as low as 1–2% for certain denial types. Yet among those who do appeal, a significant majority win at least partial relief. The gap between who appeals and who wins when they do is the core of the problem.

Why do most people not appeal insurance denials?

The most common reasons: the denial letter is written in confusing language that makes the process seem impossible, people assume the insurer's decision is final, the time and paperwork involved feel overwhelming, and many people don't know they have a legal right to appeal at no cost. The insurance industry's appeal process is intentionally complex in ways that discourage follow-through.

What happens if I don't appeal a health insurance denial?

If you don't appeal, the denial becomes final. For CO-group denials, the amount is typically written off by the provider. For PR-group denials — which the insurer says you owe personally — you remain responsible for the balance and it may eventually go to collections. Exhausting your appeal rights is also required before you can pursue legal remedies.

What Changes the Outcome

The single most predictive factor in whether someone pursues an appeal is whether they have access to clear, actionable information at the moment they receive the denial — not days later when the urgency has faded.

ClaimCompass exists to close that gap. Upload your denial within minutes of receiving it. Know your chances in about 30 seconds. Fight back —free.

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ABA Therapy Denials for Autism — How to Fight Back How to Appeal a Medicare DME Denial — Wheelchairs, CPAP, and Medical Equipment How to Appeal a Mental Health Coverage Denial

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