What Happens After a Claim Denial
Receiving a denial letter can feel like a dead end, but it rarely is. Most health insurance plans — and many other insurance policies — give you two structured paths to challenge a denial: an internal appeal handled inside the insurance company, and an external review conducted by an independent organization. Understanding how these differ is the first step toward picking the right one for your situation.
Before choosing a path, read your denial letter carefully. It should explain the reason for the denial and outline your appeal rights and deadlines. If the language is confusing, our article on why insurance claims get denied can help you decode what each reason actually means.
Keep in mind that this article provides general educational information, not personalized legal or insurance advice. Policy terms, deadlines, and available remedies vary by plan type, state, and insurer. Always verify the specific requirements in your policy documents and consult a licensed professional if you need guidance tailored to your situation.
Internal Appeal: How It Works
An internal appeal is a formal request asking your insurer to reconsider its decision — reviewed by people within the company who were not involved in the original denial. For most health plans governed by the Affordable Care Act, insurers are required to complete a standard internal appeal within 30 days for pending services or 60 days for already-received care. Expedited appeals for urgent medical situations must be resolved within 72 hours under federal rules.
You typically need to submit a written request, any supporting documentation (medical records, a letter from your provider, or corrected billing codes), and a clear explanation of why you believe the denial was wrong. The process costs you nothing in fees, and you don't need legal representation — though having your provider advocate alongside you can strengthen your case.
Internal appeals work best when the denial stems from a missing document, a coding error, or a misunderstanding of plan terms. They are faster and simpler than external review. However, the insurer still controls the process, which means outcomes on more complex disputes — especially medical necessity denials — can be inconsistent.
| Criterion | Internal Appeal | External Review |
|---|---|---|
| Who decides | Insurer (new reviewer) | Independent Review Organization |
| Typical timeline | 30–60 days standard; 72 hrs urgent | 45 days standard; 72 hrs urgent |
| Binding on insurer? | No — insurer can uphold denial | Yes — legally binding decision |
| Cost to consumer | Free | Small fee (often waivable) |
| Best for | Admin errors, coding issues | Medical necessity disputes |
| Requires prior step? | No — first available option | Usually yes — after internal appeal |
| Clinical expertise involved? | Sometimes, but internal | Yes — independent clinical experts |
External Review: How It Works
If your internal appeal is denied — or in some cases, if you choose to skip straight to external review — you can request that an independent organization called an Independent Review Organization (IRO) evaluate your case. IROs are certified by states or the federal government and have no financial relationship with your insurer, which makes their review genuinely impartial.
Under federal rules, most health plan enrollees have the right to request external review after exhausting internal appeals. Many states extend similar rights to other types of insurance. The external reviewer's decision is binding on the insurer: if the IRO rules in your favor, the insurer must pay or cover the service, with limited ability to challenge the outcome.
External review is particularly powerful for medical necessity disputes because IROs use independent clinical experts to evaluate the case. Turnaround times are typically 45 days for standard requests and 72 hours for expedited urgent-care cases under federal guidelines. There is usually a small filing fee — often waived if you meet certain income thresholds — but costs are otherwise minimal.
For a broader view of how external review fits into the full dispute process, see the full roadmap to handling an insurance dispute.
~40%
External review overturn rate for health denials
Federal data has shown that consumers who pursue external review win a meaningful share of cases, though outcomes vary by plan type and dispute category.
72 hrs
Expedited external review deadline (urgent care)
Under federal Affordable Care Act rules, insurers and IROs must resolve urgent-care external review requests within 72 hours of the request being filed.
Side-by-Side Comparison and How to Decide
Both paths exist for good reason, and they are designed to be used in sequence rather than as pure alternatives. Most plans require you to complete at least one internal appeal before requesting external review. Think of internal appeal as the required first step — and external review as a meaningful backstop if that step fails.
When choosing, consider three factors: the reason for denial (administrative errors favor internal appeal; medical necessity disputes favor external review), your timeline (internal appeal is faster in most cases), and how much is at stake (larger or more complex claims may justify pursuing both steps fully).
If your internal appeal stalls or you believe the insurer is acting in bad faith, you also have the option to file a complaint with your state insurance commissioner — a separate avenue that runs alongside the appeal process. Learn more in our guide to filing a complaint against your insurance company. For situations that escalate further, the state insurance commissioner vs. small claims court comparison walks through those options.
Deadlines Matter — Act Quickly
Both internal appeals and external review requests come with strict deadlines, often as short as 180 days from the date of your denial notice. Missing a deadline can waive your right to appeal entirely. As soon as you receive a denial, note the deadlines listed in the letter and start gathering your documentation. If you are unsure of your deadline, contact your insurer's member services line or your state insurance department for clarification.
For step-by-step guidance on formally submitting your appeal, see our article on disputing an insurance claim denial.
This article is for general informational purposes only and does not constitute legal, financial, or insurance advice. Coverage rights, appeal deadlines, and available remedies vary by plan, insurer, and state. Read your policy documents carefully and consult a licensed insurance professional or attorney for guidance specific to your situation.
