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Start with the written denial or explanation of benefits (EOB): identify what the insurer refused to cover, why, and the deadline and address for challenging it. If the dispute is about an unexpectedly high out-of-network bill, separately check whether the No Surprises Act limits what you can be charged. You may need to pursue both routes: an insurance appeal challenges the plan’s coverage or payment decision; a No Surprises Act complaint challenges a bill that may violate federal billing protections.
This guide covers private health coverage. Medicare, Medicaid, TRICARE, VA and other public programs have separate appeal procedures. For any plan, the denial notice and plan documents control the specific filing instructions; rules can vary by plan type and state.
First, identify what you are challenging
An out-of-network bill does not by itself prove that the insurer wrongly denied a claim. Read the EOB and denial letter alongside the bill: the insurer’s decision and the provider’s charge are related, but they are not the same dispute.
A denied claim or reduced payment
If the plan says a service is not covered, was not medically necessary, or was paid at a lower amount than expected, challenge the plan’s decision through its appeal process. The denial notice should explain the reason and how to appeal.
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A balance bill that may be protected
If a provider is asking you to pay more than your in-network cost sharing for emergency care or certain services connected with an in-network facility, check whether No Surprises Act protections apply. If the bill may violate those protections, contact the No Surprises Help Desk as well as pursuing any separate insurance appeal.
Both problems at once
You can have a claim denial and a disputed out-of-network bill arising from the same visit. Keep the two routes moving in parallel: ask the insurer to reconsider its coverage or payment decision, and raise a possible billing-protection violation through the appropriate complaint channel. A complaint about the bill does not replace an insurance appeal.
| What you are disputing | Where to start | What the process addresses |
|---|---|---|
| The plan denied coverage or payment, or paid less than you believe it should | Internal appeal to the insurer, using the denial notice’s instructions | Whether the plan should reconsider its decision under the plan terms and applicable rules |
| A provider charged an out-of-network amount that may breach No Surprises Act protections | No Surprises Help Desk at 1-800-985-3059 | Whether the bill may conflict with federal surprise-billing protections |
| The insurer denied the claim and the provider sent a potentially protected bill | Use both routes; do not wait for one to finish before checking the deadline for the other | The insurer’s decision and the provider’s bill are separate questions |
Check whether the No Surprises Act may limit the bill
The No Surprises Act took effect January 1, 2022. CMS says its protections cover many people with employer-sponsored and individual-market private coverage against certain unexpected out-of-network bills. The protections are not a guarantee that every emergency claim is covered: check whether your plan covers emergency care, and appeal separately if the insurer denied payment. “The No Surprises Act is a federal law that went into effect on January 1, 2022.”
Emergency services
If your plan covers emergency care, the Act generally limits your cost sharing for covered emergency services to the in-network amount, even if the hospital, a provider at the hospital, or an air ambulance provider is out of network. The protection can apply to the emergency room visit and related emergency services. Ground ambulance services are generally outside the Act’s billing protections unless state law provides protection.
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Care after emergency treatment
Protections generally continue for post-stabilization care, but some circumstances allow a provider to seek a notice-and-consent waiver. A provider cannot ask you to waive protections for emergency services in an emergency room. Certain specialists and emergency-related services also cannot use these waivers. If you are asked to sign a waiver for later care, do not assume it applies to every service; read it carefully and ask how it affects the specific care at issue.
Some planned care at an in-network facility
Protections can also apply in specified situations when you receive planned care from an out-of-network provider at an in-network hospital, hospital outpatient department, or ambulatory surgical center. They generally do not extend to other settings such as a standalone doctor’s office or an out-of-network facility. The facility, service, and circumstances matter.
Report a potentially improper bill
If the bill appears inconsistent with these protections, contact the No Surprises Help Desk at 1-800-985-3059. Have the bill, EOB, dates of service, and details about the facility and care available. Keep pursuing a timely insurer appeal if the plan also denied coverage or payment.
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File an internal appeal with the insurer
HealthCare.gov’s general consumer guidance gives people 180 days after receiving a denial notice to file an internal appeal. That is a general guideline, not a substitute for the deadline that applies to your particular plan and decision. Check the notice and governing plan documents, including the Summary Plan Description for job-based coverage, and follow the listed recipient, form, and submission method.
- Read the denial and EOB. Note the reason for denial, date you received the notice, claim number, service date, appeal address or portal, and filing deadline. Identify whether the plan denied the whole claim, denied a particular service, or paid at an out-of-network rate.
- Ask for relevant records if needed. For job-based plans, the Department of Labor says participants may request relevant claim records and plan documents without charge. Ask for records that help explain the decision or clarify the applicable plan terms.
- Prepare a focused appeal. Use the insurer’s required form if one is specified, or write to the insurer with your name, claim number, and insurance ID. State plainly that you are appealing, identify the service and decision, and respond to the reason the plan gave.
- Attach supporting material that fits the dispute. Depending on the issue, this may include the EOB and denial, an itemized bill, relevant medical records, a treating clinician’s letter explaining the emergency circumstances or medical necessity, or records clarifying the provider’s network or facility status.
- Submit it on time and keep proof. Save the complete appeal and attachments, along with proof of delivery or electronic submission. If you speak with the insurer, record the date and time, the representative’s name and title, and what was discussed.
Appeal letter framework
Use this as an organizing aid, not as a replacement for a required insurer form or plan-specific rules. Replace the bracketed fields in the letter with your information.
Subject: Internal appeal of denied claim [claim number]
Member: [name and member ID]
Date of service: [date]
Provider/facility: [name]
I am appealing the denial of [service/claim] dated [date of denial]. The denial states [quote or accurately summarize reason]. I believe the claim should be reconsidered because [brief factual explanation]. This was emergency care / care related to [explain circumstances]. Please review the enclosed [records, clinician letter, itemized bill, EOB, other evidence]. Please confirm receipt and tell me the expected decision date.
If this request qualifies as urgent because delay could seriously jeopardize my health or ability to regain maximum function, please process it as an expedited appeal.
Sincerely,
[name]
Ask for expedited review if waiting could seriously harm your health
If the standard appeal timetable could seriously jeopardize your life or health, or your ability to regain maximum function, tell the plan why and ask how to submit an expedited appeal. Explain the medical risk of delay and provide supporting information if available. Do not assume a request is expedited unless the plan confirms the process.
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For a qualifying urgent case, HealthCare.gov says you may be able to request external review before the internal process is complete and submit the internal appeal and external-review request at the same time. CMS’s federal process also recognizes expedited external review for qualifying urgent conditions and certain disputes about admission, availability of care, or continued stay after emergency services when the patient has not been discharged.
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If the insurer’s final internal decision still denies the claim, read that notice immediately for the external-review instructions. HealthCare.gov’s general guidance describes a written request within four months after you receive the denial or final determination. State procedures and plan arrangements may differ, so use the deadline and filing route stated in your final notice.
External review is independent of the insurer and is available for eligible disputes, including some denials involving medical judgment or experimental or investigational treatment. The applicable reviewer may be a state process, a federal process, or an independent review organization. Your final denial or EOB should identify the route; a state Consumer Assistance Program or Department of Insurance may be able to help you find it.
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Know which deadlines apply to your case
These are general consumer timeframes described by HealthCare.gov and CMS, not a promise that every plan follows the same procedure. Filing deadlines, response periods, and review routes depend on the type of decision, plan, state, and applicable rules. Confirm the specific dates in your notices and plan documents.
| Stage or request | General timeframe | How to apply it |
|---|---|---|
| File an internal appeal | HealthCare.gov’s general guidance gives 180 days after receiving the denial notice | Follow the deadline and filing instructions in your denial notice and plan documents. |
| Insurer decision on an internal appeal | HealthCare.gov’s 2026 guidance lists 30 days for an appeal about a service not yet received and 60 days for an appeal about a service already received | These are general decision timeframes, distinct from the period to file an appeal. Ask the plan when it expects to decide your case. |
| Request external review | HealthCare.gov’s general guidance gives four months after receipt of the denial or final determination | Check the final notice: state or plan procedures may differ. |
| Standard external-review decision | Up to 45 days under HealthCare.gov guidance; CMS gives the same maximum for the HHS-administered federal route | The applicable reviewer and procedure depend on your plan and state. |
| Expedited external-review decision | Up to 72 hours under HealthCare.gov guidance and CMS’s HHS-administered federal process | Use the expedited route only when you meet its urgency criteria; the applicable process may vary. |
Keep a usable record of the dispute
Keep copies of the EOBs and denial letters, your appeal and supporting documents, proof of delivery, and any representative authorization if someone is acting for you. Save detailed notes of calls, including the date, time, representative’s name and title, and the conversation. This record can help you track what was sent, which deadline is next, and whether the insurer or provider has responded.
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