Health insurance denials and appeals

How the law usually works

Insurers generally decide claims by applying the health plan, policy terms, medical-necessity rules, network rules, prior-authorization requirements, and applicable insurance laws. A denial may involve treatment before it occurs, a claim for treatment already received, or a bill that the insurer processed incorrectly.

Common reasons for denial include:

• The service was said to be medically unnecessary or experimental.
• Required prior authorization or a referral was missing.
• The provider was out of network.
• The insurer said the service was excluded or not covered.
• The claim was filed late or contained coding or billing errors.
• The insurer said another insurer, an employer plan, workers’ compensation, or an automobile insurer should pay.
• The policy was inactive or premiums were allegedly unpaid.

The explanation of benefits, denial letter, or other claim notice usually states the reason, the amount involved, and how to appeal. It may not be the same as a bill. A provider’s bill can contain errors, and an insurer’s payment decision can sometimes be corrected without a formal legal dispute.

In the United States, many employer and individual plans have a formal internal appeal process. Federal rules generally require a meaningful review and, in many cases, an opportunity for external review by an independent organization. The process can differ for employer plans governed by ERISA, government programs such as Medicare and Medicaid, and plans regulated primarily by a state.

An appeal usually asks the insurer to reconsider based on the policy and medical evidence. It is not usually a lawsuit. The insurer may review records, ask for information from the treating clinician, and issue a written decision. Some urgent cases receive an expedited review.

Common processes

1. Review the denial notice and policy. People commonly identify the exact denied service, denial reason, claim number, policy provision, appeal deadline, and instructions. They also check whether the denial concerns coverage, medical necessity, coding, network status, or a coordination-of-benefits issue.

1. Ask for the claim file or explanation. The insurer may provide the clinical criteria, medical records considered, benefit language, coding information, and the identity or qualifications of the decision-maker where applicable. A customer-service call can clarify an obvious processing error, but written confirmation is useful.

1. Check the medical bill. People commonly compare the bill with the explanation of benefits and request an itemized bill from the provider. They may ask the provider’s billing office to correct an incorrect procedure code, diagnosis code, date, provider identification number, or insurance submission.

1. Ask the treating clinician for support. A clinician may submit a letter explaining the diagnosis, proposed treatment, urgency, prior treatments, and why the service meets the plan’s medical-necessity standard. Relevant records, test results, published guidance, and treatment history may be included.

1. Submit an internal appeal. An appeal commonly identifies the patient and claim, explains why the decision is wrong, attaches supporting documents, and requests the specific payment or authorization sought. People often keep proof of submission and copies of everything sent.

1. Use expedited review when delay could seriously harm health. A clinician may request urgent review for a service that has not yet occurred. The insurer’s deadline can be much shorter than for a standard appeal.

1. Request external review or another independent process. If available, an independent reviewer, regulator, ombudsman, or government program may examine whether the denial complied with the policy and applicable rules. External review may be limited to particular types of denials, especially medical-necessity decisions.

1. Address payment while the appeal is pending. People commonly ask the provider about a billing hold, payment plan, financial assistance, or whether collection activity will be paused. A provider may still seek payment unless a law, contract, or agreement limits that action.

1. Complain to a regulator or ombudsman. Complaints can help identify improper handling, delay, misleading notices, or repeated errors. A complaint does not always replace an appeal or extend its deadline.

Deadlines and time limits

Deadlines depend on the plan, government program, country, state or province, and type of review. In the United States, health plans commonly provide about 180 days after an adverse benefit determination to request an internal appeal, although other periods can apply. Urgent appeals may be decided within days, while standard pre-service and post-service reviews commonly have different time frames.

External-review requests may have deadlines measured in months, and Medicare, Medicaid, and employer plans can use different procedures. A lawsuit under an employer plan may also be subject to a plan deadline or a court limitation period.

In England and Wales, private insurers commonly set complaint stages and time limits in policy documents and regulatory rules. NHS complaints have their own procedures and usually should be raised within a stated period after the event or discovery of the problem.

Canadian provincial plans and Australian private insurers also use plan or program-specific deadlines. These are typical patterns, not a universal rule. People commonly confirm the applicable deadline with the insurer, relevant government program, court, regulator, or a licensed attorney where they live.

Documents that usually matter

• Policy, certificate of coverage, member handbook, or plan summary
• Denial letter and explanation of benefits
• Itemized medical bills and account statements
• Claim forms, claim numbers, and correspondence
• Medical records, test results, treatment notes, and prescriptions
• Clinician letters and prior-authorization requests
• The insurer’s medical policy or coverage guideline
• Referral records and proof of network status
• Evidence of other insurance, workers’ compensation, or accident coverage
• Notes of telephone calls, including dates, names, and promised actions
• Proof that an appeal or complaint was submitted on time

How it differs by jurisdiction

United States: Federal law, state insurance law, and the type of plan all matter. The Affordable Care Act supports internal appeals and external review for many insured plans. State insurance departments commonly regulate fully insured policies, while self-funded employer plans may fall mainly under ERISA and federal oversight. Medicare and Medicaid have separate appeal systems. Emergency-treatment protections and surprise-billing rules may also affect accident-related care, but they do not resolve every coverage dispute.

England and Wales: NHS-funded care is generally handled through NHS complaints and clinical or administrative review processes rather than a private health-insurance appeal. Private medical insurance disputes usually follow the insurer’s complaint procedure and may be taken to the Financial Ombudsman Service, subject to eligibility and time limits. The Financial Conduct Authority regulates insurers and complaint handling, while the NHS has separate complaint bodies and procedures.

Canada: Provincial and territorial health plans pay for core insured hospital and physician services, while private insurance often covers prescription drugs, dental care, travel medical expenses, rehabilitation, or other benefits. A denial may therefore require contact with a provincial health ministry, hospital or health authority, private insurer, or an industry ombudsman. The responsible process varies significantly by province and by benefit type.

Australia: Medicare and public-hospital arrangements are separate from private health insurance. Private insurers commonly require an internal complaint or dispute process, followed in eligible cases by the Australian Financial Complaints Authority. The Private Health Insurance Ombudsman and government health agencies provide information or complaint assistance. State and territory rules can matter for hospitals, treatment, and health complaints.

Within the United States, state laws differ on mandated benefits, prompt-payment rules, external review, surprise billing, and regulator authority. A state insurance department can help identify whether a particular plan is state-regulated.

When people consult a lawyer

Legal advice can be especially useful when:

• The denial involves a large bill or potentially life-changing treatment.
• The insurer threatens cancellation, rescission, or collection.
• The deadline is near or has allegedly passed.
• The plan is employer-sponsored, self-funded, Medicare, Medicaid, or otherwise subject to special rules.
• The treatment followed a motor-vehicle accident, workplace injury, or third-party injury claim.
• The insurer may be acting in bad faith or repeatedly ignoring medical evidence.
• You are considering litigation, arbitration, or a claim for interest, penalties, or damages.
• The dispute involves privacy, disability discrimination, emergency care, or continued access to essential treatment.

If an accident caused the injury, a lawyer may also need to coordinate health insurance reimbursement, medical liens, workers’ compensation, and a liability claim. Those issues can affect how bills are paid even when the health-plan denial itself is correct.