Health Insurance Claim Denial Appeal Process in the U.S.
In the United States, the health insurance claim denial appeal process starts with the plan’s written decision, but the right outside help depends on how the plan is funded and what kind of denial you received. The name on your insurance card does not always identify who bears the claims risk or which regulator has authority. Start with the denial notice, identify the plan type, and calendar the appeal deadline.
Key Takeaways
- Check your plan before choosing a regulator. An employer may use an insurer to process claims while paying benefits itself. Ask whether the plan is fully insured or self-funded.
- File the internal appeal on time. Many private-plan members have at least 180 days after receiving a denial notice. Follow the notice and plan documents, which may give you more time or describe multiple appeal levels.
- External review has eligibility rules. It commonly applies to disputes involving medical judgment or experimental treatment. The denial notice should identify whether you qualify and which state or federal process to use.
- A complaint is not an appeal. Contacting a regulator or assistance program does not submit your appeal to the plan. Do not assume a complaint pauses the plan’s deadline.
Who this guide is for
This guide is for people in the United States with private employer, individual, or Marketplace health insurance who received a denial or lower payment than expected and need to decide what to do next. It is especially useful if you are unsure whether an employer plan is self-funded, or if you have an Explanation of Benefits, itemized bill, doctor’s letter, or medical records from outside the U.S. Plan notices are usually in English; supporting records may be in Spanish, Chinese, Vietnamese, Arabic, or another language. These are examples, not a measured ranking of languages used in insurance appeals. Common sticking points include a confusing denial code, missing prior authorization, an unclear plan type, and uncertainty about whether a foreign medical record needs translation.
Scope and disclaimer: This is a practical overview of private commercial coverage, including individual and Marketplace plans and many employer plans. Medicare, Medicaid, FEHB, Marketplace eligibility decisions, and ordinary provider billing disputes have separate procedures. This article is general information, not legal, medical, or coverage advice; the plan documents and denial notice control your specific route.
How the health insurance claim denial appeal process works
Use the written notice to determine the reason, deadline, and receiving address. The process usually has two distinct stages: first ask the plan to reconsider its decision; if the final decision remains adverse and the denial is eligible, ask for an independent external review. The HealthCare.gov internal appeals guide explains the general process and records to keep.
- Read the EOB and denial notice together. An Explanation of Benefits (EOB) describes how the plan processed a claim; it is not necessarily a bill. Look for the service date, claim number, amount billed, allowed amount, amount paid, denial code, explanation, and appeal deadline. If the letter is unclear, ask the plan for the code’s meaning and the plan provision or clinical standard it applied.
- Decide whether this is a coverage decision or a billing problem. If the plan says a service is excluded, not medically necessary, out of network, or missing authorization, use the plan appeal process. If the EOB shows the plan processed the claim but the provider’s invoice does not match the patient responsibility shown there, ask the provider’s billing office to explain the balance and check for a corrected claim. You may need both steps, but they address different decisions.
- Find the appeal instructions. The notice should say where to send an appeal, what forms to use, how long you have, and whether there is another internal review level. Use that plan-specific portal, fax number, or mailing address; there is no single national address for first-level appeals.
- Build a focused record. Match each document to the reason for denial. Keep a copy of what you send and proof of submission. If you submit by mail, use a trackable method and keep the delivery record; if you use a portal, save the confirmation and uploaded files.
- Track the decision and next deadline. Calendar the plan’s response date and the deadline to request external review if the denial is upheld. Do not wait for a regulator to respond before submitting a plan appeal.
Self-funded vs. fully insured: who has authority over an employer-plan denial?
This is a major U.S. routing difference. An insurance company can appear on the card and process claims without being the party that ultimately funds the employer’s benefits. In a self-funded plan, the employer or plan bears the claims risk; an insurer or third-party administrator may handle paperwork and decisions. In a fully insured plan, the employer buys an insurance contract from an insurer. The NAIC’s ERISA overview explains why state insurance regulation generally applies to the insurance contract but not to self-funded ERISA plan benefits.
Ask your employer’s HR or benefits administrator in writing: Is this plan self-funded or fully insured, and who is the plan administrator? Request the Summary Plan Description (SPD), claims procedure, and relevant plan terms. The insurer’s brand, customer-service number, or claims portal alone may not answer the funding question.
| Coverage arrangement | First appeal route | Where to look for outside help |
|---|---|---|
| Fully insured employer plan | Use the appeal address or portal in the denial notice, usually the insurer or plan’s appeals unit. | The state insurance department may handle complaints about the insurer or policy. The state or federal external-review instructions in the final denial determine the review route. |
| Self-funded private employer plan | Appeal to the plan administrator using the plan’s claims procedure, even if an insurer processes the claim. | The U.S. Department of Labor’s Employee Benefits Security Administration (EBSA) can explain ERISA claim procedures and participant rights. A state insurance department generally cannot decide a self-funded plan’s benefit dispute. |
| Individual or Marketplace policy | Appeal to the issuer using the instructions in the denial notice. | A state insurance department or consumer assistance program may help. The notice identifies the external-review organization or process for your plan. |
These are general routes, not a substitute for reading the plan notice. State external-review systems differ, and federal rules recognize state review processes that meet required consumer protections. If your coverage is through Medicare or Medicaid, use that program’s separate appeal process instead of assuming the private-plan route applies.
Internal appeal deadlines, evidence, and response times
For many private health plans, you have at least 180 days from receiving the denial notice to file an internal appeal. Check the notice for the exact date and submission method; some plans allow a longer period, and employer plans may describe more than one internal level. For covered plans, federal claims rules generally require a decision within 30 days for a pre-service appeal and 60 days for a post-service appeal; urgent-care appeals generally receive a decision within 72 hours. The plan’s procedures and the applicable rules determine how a particular claim is classified.
Your evidence should answer the reason given, not merely restate that the bill is unfair. For a medical-necessity denial, ask the treating clinician to address the specific clinical criteria cited in the notice and explain the patient’s history, prior treatment, and why the requested care fits. For a missing-authorization or coding issue, collect the authorization record, referral, corrected claim, or provider correspondence. For a partial payment, compare the claim detail with the itemized bill, network status, deductible, coinsurance, and plan’s allowed amount.
Ask for the relevant claim records and the documents or criteria used in making the decision. Participants in ERISA-covered plans have rights to review claim-file material and receive certain relevant documents without charge. That record can reveal whether the dispute is about a plan exclusion, a missing page, a coding mismatch, or the medical judgment itself.
If the matter is urgent and waiting for the ordinary internal process could seriously jeopardize health or recovery, ask the plan how to request an expedited appeal. In qualifying urgent cases, you may be able to request external review while the internal appeal is still underway. The plan’s notice and the applicable process determine whether that option fits.
When can you request external review?
External review means an independent reviewer examines an eligible plan decision. It is not an automatic second opinion for every unpaid bill. Common eligible categories include denials based on medical necessity, appropriateness or level of care, effectiveness, experimental or investigational treatment, and certain rescissions of coverage. State procedures can vary, so read the final denial carefully; it should explain whether external review is available and how to request it.
Under the HHS-administered federal process, the request generally must be filed within four months after you receive the relevant denial notice or final internal denial notice, as applicable. A standard review is decided within 45 days, while an expedited review is decided within 72 hours. That federal process is free. A state process or issuer-contracted independent review organization may use different instructions and may charge a limited fee; HealthCare.gov says any such fee cannot exceed $25. The HealthCare.gov external review guide explains the state and federal routes. For the HHS-administered route, CMS identifies MAXIMUS Federal Services as the contractor and lists its request options, including the online portal and phone number, in its federal external-review instructions. Use the contact details printed on your denial notice to confirm that this is your route.
A federal external-review decision is binding on the plan and member under that process, subject to other remedies that may be available under law. It can uphold the denial or reverse some or all of it. Eligibility and the evidence matter; no translation provider, advocate, or reviewer can guarantee a reversal.
State complaints, federal help, and the No Surprises Act
A regulator complaint and a plan appeal do different jobs. The appeal asks the plan to reconsider a particular claim. A state insurance department may investigate a regulated insurer’s handling of a complaint, but generally does not decide benefit disputes under a self-funded ERISA plan. For an employer plan that may be self-funded, contact EBSA at 1-866-444-3272 or use its online benefits resources. For state-level help, the CMS Consumer Assistance Program map points to available state CAPs and, where a CAP is not available, other possible resources such as the state insurance department or U.S. Department of Labor. Service type and availability vary by state.
Do not confuse a consumer’s claim appeal with the No Surprises Act’s federal Independent Dispute Resolution (IDR). That IDR process resolves certain payment disputes between providers or facilities and health plans; it is not a general way for an insured patient to challenge a denied claim. If you believe a surprise-billing protection was violated, use the relevant consumer complaint route. CMS explains the provider-plan boundary in its Independent Dispute Resolution overview.
Documents and translation: make non-English evidence reviewable
For a U.S. health insurance appeal, gather the denial notice and EOB, plan or SPD language relevant to the denial, the appeal form or letter, and evidence that responds to the specific reason. For a medical-necessity dispute, this may include a clinician’s explanation and selected medical records. For an underpayment, it may include the itemized bill, claim detail, provider adjustment, and proof of payment. Do not assume every page of a foreign medical file is relevant.
If important records are not in English, pair the original pages with a complete, accurate English translation of the material that supports the appeal. Do not assume every private-plan appeal requires a particular certification format or notarization; check the plan’s instructions. A certified translation can include a signed accuracy statement and help identify who translated the document. Translate the pages that address the denial rationale, such as diagnosis, procedure, treatment dates, medication, physician findings, and itemized charges. For more on document scope and format, see which records belong in a medical insurance appeal packet, certified translation for U.S. medical records and insurance claims, and the limits of self-translation and machine translation.
What national data and consumer accounts can—and cannot—tell you
The clearest recent public claims data are limited to certain Marketplace plans. A KFF analysis of 2024 HealthCare.gov data found that insurers denied 19% of in-network claims and 37% of out-of-network claims. Fewer than 1% of denied in-network claims were appealed, and insurers upheld 66% of those internal appeals. This is a useful sign that appeals are rarely used and not always successful, but the data do not represent all employer plans, especially self-funded plans, and do not predict your case. KFF notes that the public dataset does not cover state-based Marketplace plans or group health plans. See its 2024 Marketplace claims and appeals analysis.
Reporting also shows how a denial notice can make the next step easy to miss. ProPublica described a North Carolina family whose external-review instructions were several pages into a denial letter; an independent review later overturned a costly treatment denial. That is one reported case, not a prediction of likely outcomes. It is a practical reminder to check every page of a final notice for external-review rights and to ask a free assistance program to help interpret instructions you do not understand. Read ProPublica’s account of the review process.
Service options and public resources
Most consumers should first use the appeal channel named by the plan and check free public assistance before paying a private advocate. The commercial service below addresses translation only; it does not represent members in appeals.
| Commercial translation service | Publicly described role | Check before ordering |
|---|---|---|
| CertOf | Online document translation service, including non-English medical records that may support an insurance appeal. It is not an insurer, legal representative, or official appeal service. | Confirm the source language, which pages need translation, the plan’s format instructions, expected delivery, and revision terms before submitting. |
| Public resource | Best time to contact | What it can help with |
|---|---|---|
| Health plan or claims administrator | As soon as you receive a denial or underpayment notice. | Internal appeal instructions, claim codes, plan terms, and the correct submission address or portal. |
| DOL EBSA | When a private employer plan may be ERISA-covered, the administrator will not provide plan information, or you need help understanding claim procedures. | Benefits guidance for plan participants; call 1-866-444-3272. It does not replace the plan appeal or make medical-necessity decisions. |
| State Consumer Assistance Program or insurance department | When you need help understanding a state-regulated policy or finding the right state complaint route. | State-specific assistance varies. Start with the CMS state resource map. |
| MAXIMUS Federal Services | Only when your final notice directs you to the HHS-administered federal external-review process, or explains an eligible urgent request. | Receives requests and conducts that independent review. The process is free; verify contact details against the notice and CMS instructions. |
Be cautious of any service that guarantees an appeal result or asks you to hand over your insurer-portal password. Confirm fees and representation terms before hiring a private advocate or attorney. A translation provider can prepare documents, but cannot determine whether your plan covers a service or file a regulator complaint for you.
Common mistakes that cost time
- Following the logo instead of the plan funding. A familiar insurer may only be administering a self-funded employer plan. Confirm the funding arrangement before choosing a state complaint route.
- Sending a general complaint instead of a formal appeal. Use the plan’s required appeal channel and deadline; seek regulator or CAP help in parallel.
- Appealing only with a bill. A medical-necessity denial usually needs clinical support tied to the plan’s reason, while a payment calculation dispute needs claim and billing detail.
- Assuming every denial gets external review. Check the final decision for eligibility and route. A contract or administrative dispute may not fit the same external-review criteria as a medical-judgment dispute.
- Translating too late or translating everything without a purpose. Identify relevant non-English records early and prioritize pages that answer the denial reason.
- Confusing a surprise bill with a denied insured claim. The billing protections and complaint route may differ from an ordinary appeal.
Frequently asked questions
How long do I have to file an internal health insurance appeal?
Many private-plan members have at least 180 days after receiving the denial notice. Use the exact deadline in your notice and plan documents, because they may provide a longer period or describe multiple appeal levels.
How long does a health insurance appeal take?
For many private plans, a pre-service internal appeal has a 30-day decision limit and a post-service appeal a 60-day limit; urgent-care appeals generally receive a decision within 72 hours. Under the HHS federal external-review process, a standard review takes up to 45 days and an expedited review up to 72 hours. State and plan routes may differ.
Can my state insurance department overturn a denial from my employer plan?
It may help with a fully insured policy or insurer complaint. A self-funded ERISA employer plan is generally outside state insurance regulation for benefit decisions. Ask HR or the plan administrator about funding, and contact DOL EBSA if you need help with ERISA procedures.
Can I request external review before finishing the internal appeal?
In qualifying urgent situations, you may be able to request an expedited external review while the internal appeal is pending. For other cases, follow the final internal decision and external-review instructions in your plan notice.
Can every health insurance claim denial go to external review?
No. External review is available for eligible categories, commonly including medical-judgment disputes, experimental or investigational treatment, and certain coverage rescissions. Your final denial notice should explain whether you qualify.
Do I need a certified English translation of foreign medical records?
There is no single translation format to assume for every private-plan appeal. Ask the plan what it needs. If non-English records are important to the decision, an accurate English translation—certified when appropriate—can make the clinical evidence reviewable. Do not assume notarization is required.
Is No Surprises Act IDR the same as my insurance appeal?
No. Federal IDR generally resolves certain payment disputes between a provider or facility and a health plan. To challenge the plan’s decision about your own covered claim, use the appeal instructions for your plan.
Prepare the evidence before the deadline
Start with the denial reason, funding type, and appeal deadline. Then gather only the records that address the disputed decision, including a clear English translation if key evidence is in another language. CertOf handles document translation and accuracy certification; it does not provide insurance or legal representation and cannot guarantee coverage or an appeal result. Submit documents for translation or review how online ordering works.