Fewer Than One in a Hundred Denied Claims Gets Appealed. That Is the Whole Opportunity.

The Kaiser Family Foundation went through the 2024 reporting for health plans sold on the federal marketplace. Insurers denied about one in five in-network claims. Of roughly 85 million denials, consumers appealed fewer than 263,000, which the foundation describes as an appeal rate below one percent.

The companion figure is the one that should move you. In Medicare Advantage, where the data is cleaner, more than eight in ten appealed prior-authorization denials were overturned.

Look Behind the Curtain

The rights are federal and the clock is specific. For most private plans you have 180 days from the denial notice to file an internal appeal. The insurer must decide within 30 days if the service has not happened yet, 60 days if it has, and as fast as your condition requires, within four business days, if it is urgent.

If they uphold the denial, you get an independent external review. You have four months to request it, the reviewer decides within 45 days, or 72 hours when it is urgent, and the result binds the insurer by law. That last part is what makes the whole process worth the stamp: the decision is not the insurer's to make twice.

The denial notice itself is a document you have rights over. The federal regulation requires it to state the denial code and what that code means, plus the standard the plan applied. You can also demand the claim file and the clinical criteria used, free. Most people never ask, which is why most appeals are written against a guess about why the claim was refused.

Plan type changes the route. Marketplace and most employer plans get the external review above. Medicare Advantage has its own five-step ladder, and the plan must forward your case itself if it upholds the denial. Medicaid runs through the plan and then a state fair hearing. Federal investigators found Medicare Advantage organizations overturning 95 percent of appealed denials for skilled nursing admissions, which raises an obvious question about the original decisions.

The Capability Multiplier

An appeal is a document assembly problem wearing medical clothing, and that is exactly what an assistant is good at.

What it can do well: build the timeline, organize the claim numbers, dates of service and denial codes, draft the written request for the claim file and clinical criteria, track which deadline applies to your plan type, turn the plan's own quoted exclusion language into a point-by-point response, and produce a clear, unemotional letter. Washington State's insurance regulator publishes sample appeal letters and its advice is that appeals should be factual, brief and free of emotional language, which is precisely the register a machine holds better than a frightened person does.

What it must not do is supply the medical argument or the citations. Research measuring how often these systems invent references found fabrication rates ranging from roughly a third to the overwhelming majority depending on the model. An appeal containing a clinical guideline that does not exist is worse than no appeal, and the medical necessity case has to come from the clinician who treated you, in their words, on their letterhead.

The division is clean. The assistant writes the structure and the plain-language narrative from documents you give it. Your doctor writes the clinical justification. Every quoted plan provision comes from your plan document, checked.

Only about five percent of marketplace denials in that 2024 data were medical-necessity decisions at all. More than a third were coded as other, with no reason given publicly. A great many denials are coding, eligibility or paperwork problems, which is the most winnable category there is and the one nobody appeals.

The Sovereign Action

Start the day the letter arrives, not the week the deadline closes.

• Write down two dates: 180 days from the denial for the internal appeal, and four months from the final determination for external review. Confirm which process your plan uses.
• Request the claim file, the denial code and its meaning, and the clinical criteria the plan applied. The plan must provide these, free.
• Ask your treating clinician for a letter of medical necessity. That is the part no assistant can write and the part that decides it.
• Use an assistant for structure, timeline and plain language, and check every quoted plan provision against the document. Never let it generate clinical citations.
• If the plan stalls or the answer is wrong, escalate: your state insurance department for most plans, the Employee Benefits Security Administration for employer plans.