Getting a healthcare claim denied is frustrating, especially when you know the treatment is medically necessary. Under federal law, specifically the Employee Retirement Income Security Act (ERISA) and the Affordable Care Act (ACA), you have a legal right to appeal. The process has clear rules, but you need to act fast and follow them. At WellthCare, we've seen how a denied claim can hurt both your health and your finances. WellthCare is the first Health-to-Wealth Benefit System, built to minimize claims denials by putting $0-co-pay care first and keeping every service verifiable and transparent through compliance-grade recordkeeping. But if you're facing a denial, here's what to do.
Step 1: Understand the Reason for Denial
Before you appeal, you need to know why the claim was denied. Your plan must send you a written denial, formally called an adverse benefit determination, which may also appear on your Explanation of Benefits. Read it carefully and find the exact reason. Common reasons include:
- The treatment is considered experimental or not medically necessary.
- Out-of-network care was not pre-authorized.
- Missing or incorrect billing codes.
- The service is excluded from your plan's coverage.
- Timely filing deadlines were missed.
If the reason isn't clear, call the plan administrator's customer service and ask for a detailed, itemized denial letter. Write down the date, time, and name of every person you speak with. That record could be critical later.
Step 2: Gather Supporting Documentation
An effective appeal relies on solid evidence. Start collecting:
- The denial letter. Keep the original with all reference numbers.
- Your health plan document. Find the exact language about covered and excluded treatments.
- Medical records. Get notes from your doctor, lab results, diagnostic imaging, and anything that justifies the treatment.
- A letter from your treating physician. This is the most powerful piece. Ask your doctor to explain why the treatment is medically necessary, what alternatives were tried, and how denial would harm your health.
- Peer-reviewed medical studies. If the denial cites experimental treatment, find reputable research in peer-reviewed journals, such as the AMA's JAMA, or search PubMed.
A strong evidence-based submission improves your odds of overturning the denial.
Step 3: File the Internal Appeal (First Level)
Most employer-sponsored plans must offer at least one internal appeal. You have at least 180 days from the date you received the denial to file, and your plan may allow more. Follow the specific instructions in your denial letter for where to send the appeal. In your letter, include the claim number, state clearly why the denial is wrong, reference your plan document and medical evidence, and request a full and fair review under ERISA regulation 29 CFR § 2560.503-1. You also have the right to review, free of charge, the documents relevant to your claim, and the reviewer cannot be the person who denied it or that person's subordinate. Send it via certified mail so you have proof of receipt. The plan must decide within 30 days for pre-service claims, 60 days for post-service claims, and 72 hours for urgent care. If they deny again, you'll get a written explanation of your next options.
Step 4: File a Second-Level Internal Appeal (If Available)
Some plans offer a second level of internal appeal, reviewed by someone not involved in the first denial. Check your denial letter to see whether one is available and what the deadline is. Follow the same process but strengthen your case: add any new information from your doctor, and consider requesting an independent medical review if your state offers it. If your plan has no second internal level, move to external review. Don't skip any internal step your plan requires, since courts generally expect you to exhaust the plan's appeals before you sue.
Step 5: Submit an External Appeal (If Denied Again)
If the internal appeals fail, you usually have the right to an external review. Under the ACA, most employer plans must offer an independent third-party review at no cost to you. Request the external review application from your plan's appeals department, submit it within 4 months of the final denial (some states allow more time), and the reviewer will have 45 days to issue a binding decision, or less if urgent. If your plan is insured, you can also file a complaint with your state's Department of Insurance. For self-funded plans (common in large companies), ERISA governs your rights, and external review is usually your best option before legal action.
When to Consider Legal Action
If all appeals fail and the denial is causing serious medical or financial harm, you may file a lawsuit under ERISA Section 502(a)(1)(B). But these lawsuits are complex and usually require an attorney. Talk to an employee benefits lawyer or legal aid if:
- The plan violated ERISA's procedural rules (missed deadlines, incomplete review).
- The denial is based on a conflict of interest (the administrator profits from denying claims).
- The treatment is essential and delay could cause serious harm.
Many attorneys offer free initial consultations. If you're in a union or professional organization, they might also help.
What to Know About Automated Denials
Insurers are routing more claims and prior authorization requests through algorithms, and the appeal process now runs up against that layer. California moved first to constrain the practice: its Physicians Make Decisions Act (SB 1120), effective January 1, 2025, bars coverage denials based solely on an AI algorithm and requires that any denial, delay, or change to care based on medical necessity be reviewed by a licensed physician or qualified provider with expertise in the clinical issue at hand.
If you suspect a denial was automated, add two requests to the steps above: ask for the specific medical necessity criteria the plan applied, and ask whether a licensed clinician reviewed your file. A denial letter that can't answer both questions is a sign to escalate. In June 2025, major insurers also committed to reducing the scope of prior authorization requirements by January 1, 2026 and providing better transparency about decisions and appeals, which may shorten the path for some denials.
How WellthCare Prevents Claims Denials at the Source
At WellthCare, we think the best appeal is the one you never have to file. That's why our ecosystem is built around preventive care and direct, no-claims-pathway treatments:
- $0-co-pay care used first: Employees access care without triggering traditional claim submissions, reducing denial opportunities.
- Automated compliance records: The WellthCare system tracks all qualifying preventive actions and maintains compliance-grade records, so you always have proof of service.
- Built-in guidance from the Wellby Concierge: Before a claim is even filed, the platform suggests alternative covered treatments or pre-authorization steps, acting as a proactive appeal prevention layer.
- Full transparency: With the WellthCare Readiness Index, employers can see how plan design and preventive adoption reduce claim risks, giving them confidence in self-funded coverage that rarely produces denials.
While we can't eliminate every denial, our Health-to-Wealth platform is designed to keep care and wealth moving forward without interruption.
Final Expert Advice
Don't give up. Appeals succeed more often than people assume. KFF's analysis of 2023 ACA marketplace plans found insurers upheld 56% of internal appeals, so 44% were overturned in the patient's favor. A later KFF analysis found nearly half of external reviews overturned the initial denial. A detailed letter from your treating physician is among the strongest evidence you can submit. Document everything, respect deadlines, and escalate thoughtfully. Even if your plan isn't WellthCare, these steps are your legal right. If you believe your plan isn't following the rules, contact the Department of Labor's Employee Benefits Security Administration (EBSA) or your state's insurance commissioner, or find your state's free Consumer Assistance Program. Your health and your wealth depend on persistence.
This article is for general information only and is not legal, tax, or medical advice.