Insurance

Fighting insurance denials: a tactical guide

A denial is the opening move, not the verdict. Very few people appeal, and a substantial share of appeals succeed — because most denials turn on documentation, coding, or prior-authorization technicalities rather than on the care itself.

Step one: read the denial letter properly

You are looking for two things, and they are often buried.

• The stated reason. "Not medically necessary" is a different fight from "not a covered benefit," which is different again from "out of network." The reason determines what evidence wins.
• Your specific deadline. Your plan's number, not the general rule.

If the reason is vague, call and ask them to state it precisely. Insurers are required to tell you why. Ask for it in writing.

Step two: match your evidence to the reason

This is where most appeals are won or lost. Sending everything you have is weaker than sending the right thing.

• "Not medically necessary" — a letter of medical necessity from your treating clinician, relevant clinical notes, prior failed treatments, and published guidelines supporting the treatment for your condition.
• "Experimental or investigational" — peer-reviewed literature, guidelines from the relevant specialty society, and FDA approval status if applicable.
• "Out of network" — evidence it was an emergency, or that no in-network provider with the required expertise was available. For rare conditions this second argument is often genuinely true and under-used.
• "Not a covered benefit" — the plan document language itself. Sometimes the denial is simply wrong about your own plan.

The letter of medical necessity does the heavy lifting

Ask your clinician for one. A strong version names your diagnosis and codes, describes what has already been tried and failed, explains why this specific treatment is indicated for you, and cites guidelines. Many practices have templates. Some will let you draft it for their review and signature, which is often faster.

Step three: file the internal appeal

• File through the member portal if there is one, and save the confirmation. If you mail it, use certified mail with return receipt.
• Include your name, member ID, and claim number on every page.
• State plainly what you are appealing and what outcome you want.
• Keep a copy of everything you send.

Do not wait until day 179. Gathering records takes longer than you expect.

If the situation is urgent

You can request an expedited appeal, decided in roughly 72 hours. Your treating physician generally needs to certify in writing that the standard timeline would seriously jeopardize your health or your ability to regain function. In urgent situations you can also request the external review at the same time as the internal appeal rather than waiting.

Step four: external review

If the internal appeal fails, an independent third party reviews the decision. This is the part people do not know about, and it is the strongest tool you have: the external reviewer's decision is binding on your insurer.

Generally 4 months from the final internal denial, though some states run shorter. Your final denial letter must explain how to request it. If it does not, call and demand the instructions.

If you are still stuck

• Your state insurance commissioner takes consumer complaints and can intervene. Insurers respond differently to a regulator than to a patient.
• Your employer's HR or benefits team, if the plan is employer-sponsored. Large employers have leverage with carriers that individuals do not.
• Patient advocacy organizations for your specific condition often have staff who have run this process hundreds of times.
• The Patient Advocate Foundation offers free case management for insurance and access problems.

This page is advocacy and educational content. It is not medical, legal, or insurance advice, and plan terms vary. Your denial letter and plan documents govern. It cannot account for your history, your medications, or your diagnosis. Bring what you find here to your own care team — the goal is to help you ask better questions, not to answer them for you.