How to Appeal a Denied Healthcare Claim in 5 Steps

Getting a healthcare claim denied is frustrating, especially when you know the treatment is medically necessary. Under federal law—the Employee Retirement Income Security Act (ERISA) and the Affordable Care Act (ACA)—you have a legal right to appeal. The process is transparent, but you need to act fast and follow the rules. At WellthCare, we've seen how a denied claim can mess with your health and your wallet. WellthCare is the first Health-to-Wealth Benefit System that minimizes claims denials by putting $0-co-pay care first, with automated compliance recordkeeping that keeps every service verifiable and transparent. That's why our system puts $0-co-pay care first, so you avoid the friction altogether. 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 insurance company must send you a written explanation (often an "Explanation of Benefits" or "Adverse Benefit Determination"). 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:

1. The denial letter—keep the original with all reference numbers.
2. Your health plan document—find the exact language about covered and excluded treatments.
3. Medical records—get notes from your doctor, lab results, diagnostic imaging, and anything that justifies the treatment.
4. 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.
5. Peer-reviewed medical studies—if the denial cites "experimental" treatment, find reputable research (like from the AMA or NIH) that supports its use.

A strong evidence-based submission dramatically increases your chance of overturning the denial.

Step 3: File the Internal Appeal (First Level)

Most employer-sponsored plans must offer at least one internal appeal. You typically have 180 days from the date you received the denial to file—but check your plan document, as some allow less. 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. Send it via certified mail so you have proof of receipt. The plan must decide within 30 days (72 hours for urgent care). If they deny again, you'll get a written explanation with your right to a second-level appeal.

Step 4: File a Second-Level Internal Appeal (If Available)

Most ERISA plans give you a second independent internal appeal, reviewed by someone not involved in the first denial. 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. The timeline will be in your denial letter. Skipping this step can cost you your right to sue later.

Step 5: Submit an External Appeal (If Denied Again)

If both internal appeals fail, you usually have the right to an external review. Under the ACA, most plans let you ask an independent third party to review the decision—often free and more objective. Request the external review application from your plan's appeals department, submit it within 4 months of the final denial (timelines vary), and the reviewer will have 45 days to issue a binding decision (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 under ACA 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). 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.

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 IRS/HIPAA-compliant records, so you always have proof of service.
• Built-in guidance from Your 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 exactly 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 Operating System is designed to keep care—and wealth—moving forward without interruption.

Final Expert Advice

Don't give up. Statistically, over 40% of internal appeals are successful, and that number rises significantly when you involve your doctor and provide concrete clinical evidence. 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. Your health—and your wealth—depend on persistence.