What to Do When Health Insurance Denies a Claim
A health insurance denial can be challenged through an internal appeal, followed by an independent external review when the plan permits it. The strongest response identifies the exact reason for denial, requests the insurer’s full clinical criteria, gathers records showing why the treatment is medically necessary, and submits a timely appeal supported by the treating provider. For a 2026 policy, consumers should first distinguish a final claim denial from a prior-authorization request, provider billing issue, or request for more information, because each situation has a different process. Deadlines are unusually strict: many employer plans allow 180 days for an internal appeal, while Medicare generally allows 60 days, and Medicaid deadlines vary by state and program.
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Do not assume every denial is permanent or valid just because it appears in an online portal. Insurers may apply medical-necessity rules incorrectly, overlook a document, use the wrong billing code, or fail to consider the patient’s complete history. Reviewers can include a new medical reviewer during external review, although they generally may not consider new reasons that the plan never stated in its denial. A patient can still correct factual errors and submit supporting evidence, but an appeal should be framed around the stated reason for denial rather than simply insisting that the patient deserves the treatment.
Identify the Denial and Read the Plan Materials
Start with the denial letter, not a billing statement from the doctor. The letter should identify the claimant, service, provider, decision date, reason or reason category, applicable medical policy, and appeal instructions. A claim may have been denied because a service was not medically necessary, lacked prior authorization, was considered experimental or investigational, exceeded a benefit limit, was received from an out-of-network provider, or was coded differently from what was actually furnished. A prior-authorization denial occurs before treatment, while a post-service claim denial arrives after care was received; both can be appealed, but the evidence and urgency may differ.
The plan’s evidence booklet is especially important. It should describe the criteria used to make the decision and distinguish covered services from excluded ones. Search it for the diagnosis, medication, procedure, or policy name rather than relying only on the denial wording. If the listed policy is not in the booklet, request the complete policy, current version, supporting clinical guidelines, and any documents used in the decision. Keeping copies of the letter, policy, claim, prescription, and appeal submission creates a record showing what the insurer knew and when.
A billing dispute is different from a coverage appeal. If the insurer paid only part of a bill, contact both the provider and insurer and ask for the remittance advice and claim codes. The provider may correct a coding error, but the patient should not ignore the insurer’s deadline while waiting for billing clarification. If timely filing is disputed, submit a protective appeal that clearly says the patient disputes timeliness, asks for the claim’s date of receipt and proof of timely submission, and states that all information remains available.
Follow the Internal Appeal Process
Most internal appeals require a written request, a patient or authorized representative signature, and a statement disputing the decision. The appeal should identify the denied claim or service, explain why the service is medically necessary, and attach the insurer’s criteria, relevant records, prescription information, laboratory results, and a letter from the treating clinician. A patient should not simply repeat the diagnosis. The response should connect the patient’s specific facts to each criterion in the insurer’s medical policy, addressing prior treatments, expected outcomes, risks of delaying care, and why less expensive alternatives are unsuitable or have already failed.
Patients may be able to submit an appeal online, by mail, by fax, or through a plan representative, depending on the plan. Online submission provides a confirmation number, but the user should save screenshots and downloaded files. A mailed appeal should use a trackable delivery method when the deadline falls close to the end of the appeal period. Fax confirmations can also help establish delivery, although receipt should be verified because a successful transmission does not always mean every page was included. The plan may offer a recorded telephone appeal, but a written record is easier to audit and reproduce.
The deadline normally runs from the date listed on the denial notice, not when the patient first opened the portal. Employer-plan members covered by the Affordable Care Act generally have 180 days for internal claims and appeals concerning medical necessity, rescission, or other ACA-protected reasons, though contractual rules may differ. Medicare recipients generally have 120 days to request an appeal for many original Medicare claims, although the standard part A and B appeal period is commonly described as 60 days from the remittance notice. Always use the date printed on the actual notice.
| Issue | Common internal-appeal rule | Action to confirm |
|---|---|---|
| Employer or individual major-medical plan | Often 180 days for an ACA-protected claim appeal | Read the denial letter and evidence booklet |
| Medicare original fee-for-service claim | Often 120 days after receiving the Medicare appeal request form; many notices call this the 60-day appeal period | Confirm the date and form named in the notice |
| Medicare Advantage | Generally at least 45 days under federal requirements, subject to plan rules | Follow the plan’s portal and notice |
| Medicaid | Often 90 days internally, but state and managed-program rules vary | Check the state’s notice and managed-care rules |
| Short-term or non-ACA plans | Contract-specific deadlines may be shorter | Do not assume ACA timing applies |
A strong appeal begins by quoting or accurately paraphrasing the plan’s denial reason. For example, if the insurer denied a medication because criteria were not met, the appeal should address each unmet criterion rather than calling the decision unfair. If the denial concerns prior authorization, the patient should show that the service was reasonable and medically necessary and explain why authorization was requested late, if that occurred. For a site-of-care denial, include evidence that the hospital outpatient setting is appropriate, necessary, or more protective than an unapproved lower-cost setting.
The clinician can explain the diagnosis, treatment history, response to earlier therapy, anticipated benefits, risks of postponement, and reasons alternatives are unsuitable. Hospital discharge summaries, office notes, imaging reports, pathology results, laboratory trends, specialist opinions, and pharmacy records can support those statements. A short personal statement is also useful: it can describe symptoms, functional limitations, missed work or school, and the practical effect of the denial. Personal accounts should supplement—not replace—the medical record.
Patients should watch for inconsistent or invented clinical claims. It is safer to say, “My physician documented no improvement after the trial listed in the insurer’s criteria,” than to state that every alternative has failed unless the record proves it. If relevant, include consensus guidance from a recognized medical society, but attaching an entire guideline does not automatically prove coverage. The best appeal selects the passages applying to the patient’s disease stage, treatment, comorbidities, and prior history.
Ask the provider to review the final submission for accuracy and medical support. The patient should avoid social-media language, accusations, threats to complain publicly, and irrelevant financial material. The goal is to make the insurer’s decision easy to evaluate against its own criteria. If treatment must begin immediately, ask the plan and provider whether an expedited internal appeal or urgent inpatient-continuation request is available. A request for expedited review should explain that waiting for the ordinary process could seriously jeopardize life, health, or recovery ability; simply saying the medication is important is not necessarily enough.
Escalate to External Review or a Regulatory Complaint
If the internal appeal is denied or the insurer misses a required deadline, a second review may be available. Individual and employer plans governed by the ACA generally provide external review for certain adverse benefit determinations, including medical-necessity decisions and rescissions. The notice should explain whether external review is available, describe the available external-review service, and provide a form. Depending on the issue, the plan may charge a nominal fee, commonly no more than $25, though the notice controls. External review is not a second copy of the same internal appeal, and consumers should not skip the internal stage when it is required.
Federal rules generally provide at least 60 days to request external review after completion of the internal appeal. The exact period can vary by plan or governing regulation, and Medicaid-managed-care rules are commonly different. An expedited external review is generally decided within 72 hours when the ordinary process could seriously jeopardize health or recovery. Patients should check whether the plan properly classified the request as urgent and should document the medical reason immediately.
If external review is unavailable, an appeal may still be pursued through a state insurance department, managed-care regulator, ERISA plan administrator, or court where permitted. A state complaint is not automatically a substitute for a claim appeal and may not stop the plan’s deadline. A patient can often pursue an internal appeal and a regulatory complaint at the same time, but legal advice is appropriate for a large claim, disputed rescission, experimental treatment, or threatened interruption of critical care. The U.S. Department of Labor’s EBSA provides assistance and complaint processes for many employer health-benefit issues, while the relevant state insurance or Medicaid agency handles many state-regulated plans.
Alternatives When Coverage Cannot Be Obtained
An overturned claim is only one outcome. The patient and treating clinician may consider another approved medication, a different procedure, a different setting of care, a covered alternative, or enrollment in a different plan during the next open enrollment period. Switching doctors or facilities can help with a network or administrative issue, but changing providers does not itself establish medical necessity. If a prescription is denied, the prescriber may request a different covered drug or use a pharmacy assistance program. If a procedure is denied, the provider may document a compelling reason for an exception request.
Some plans permit exceptions for treatments outside published medical-necessity criteria. These may require the physician to show that standard treatment is ineffective, contraindicated, or substantially more burdensome and that the requested service is medically appropriate. A failed exception request can normally be challenged under the plan’s claim-appeal process, but external-review rights may depend on the exact reason for the determination. Patients should distinguish an exception request from a clinical appeal and ask the plan which pathway applies.
| Alternative | Best use | Possible limitation | Expected cost |
|---|---|---|---|
| Covered alternative treatment | Unmet medical policy despite reasonable clinical support | May be less effective, have more side effects, or delay care | Copay, coinsurance, or deductible under the plan |
| Plan exception request | Treatment is appropriate but falls outside ordinary criteria | Approval is discretionary and usually needs strong physician support | No special appeal fee is always required, but the service may carry normal cost-sharing |
| In-network provider change | Denial concerns contracting or network status | May not solve medical-necessity, prior-authorization, or benefit-limit denials | Often lower cost when in network |
| Manufacturer or patient-assistance program | Access to an expensive authorized medication | Eligibility, pharmacy participation, and renewal rules apply | Commonly free or reduced-cost, but not guaranteed |
| Medicaid, CHIP, or marketplace assistance | Coverage changes caused by income or eligibility changes | Requires eligibility, qualifying life event, or open-enrollment access | Depends on program and income |
Common Mistakes and Time-Sensitive Warning Signs
The most damaging mistake is missing the appeal deadline. Consumers should enter the notice date immediately, identify the internal and external deadlines, and set reminders well before each date. Another common error is filing multiple pages without an index or failing to attach records, which increases the risk that critical evidence will be overlooked. Mailing a form without the required authorization is also risky; a patient may sign, or a properly designated personal representative, legal guardian, or authorized assignee may sign where allowed.
Do not appeal the wrong decision or ask for a different reason. If the insurer upheld a prior-authorization denial but did not decide medical necessity, the next request should accurately state that issue. A patient should preserve every submission and confirmation and ask the plan for the complete claim file, including the medical necessity determination, utilization-management criteria, policy version, reviewer credentials, and documents considered. Denial rates and approval patterns can be useful for planning, but the correct standard is whether this claimant and treatment satisfy the applicable policy—not whether the insurer frequently denies claims.
Act immediately when a denial concerns insulin, transplant anti-rejection drugs, cancer treatment, acute inpatient care, pregnancy-related care, a time-sensitive surgery, or a medication needed to prevent severe withdrawal. Urgent requests should include a one-page clinician explanation explaining the deadline and why ordinary review would endanger health. Even a nominally short standard appeal, such as 30 days under a non-ACA policy, can take weeks to decide, so early filing is important. If a required medication is interrupted, contact the prescriber and pharmacy on the same day rather than waiting for an appeal decision.
When to Use an AI Insurance Broker or Other Help
An AI insurance broker can help compare plan designs, estimate total annual costs, identify restrictive network or prior-authorization rules, and organize deadlines, but automated software should not decide the strength of a medical appeal. In-surely.com should treat AI as a support tool, not a replacement for the treating physician, plan administrator, regulator, or legal counsel. Health claims contain sensitive medical information, so users should review a broker’s privacy practices, avoid uploading unnecessary identifiers, and confirm whether the service can store conversations or documents. Recommendations based only on premium can miss carrier contracts, formularies, provider availability, and claim-level exclusions.
Professional help is sensible when the treatment cost is very high, the plan is self-funded, the issue involves rescission, an experimental therapy, employer-plan fiduciary rules, or a conflict between providers. A patient advocate, patient liaison, legal-aid organization, or insurer ombudsman may help navigate facts, although an ombudsman is not usually the decision-maker on a formal appeal. A certified public adjuster generally should not be used for health-insurance claims unless state law specifically permits that role.
The best service model is therefore one that combines disciplined document organization with a visible human option for escalation. It should calculate worst-case out-of-pocket exposure, not merely the lowest premium, and explain that underwriting results and claim appeals are separate processes. A consumer should never surrender the right to internal or external review, accept a plan change, or sign a release merely because an AI or broker suggests it. Timely documents, a provider-supported medical rationale, and the correct review channel remain more important than the choice of software.