Indiana Health Insurance Claim Denied in 2026? Here’s What to Do First

A denied health insurance claim can feel urgent, confusing, and unfair — especially when the bill is large or the care was recommended by your doctor.

The first thing to know is that a denial is not always the final answer. Many health insurance denials can be appealed, but the next step depends on what kind of denial you received, what type of plan you have, and whether the denial involves medical judgment, missing paperwork, billing, or plan rules.

This guide is for Indiana patients who are asking: “My health insurance denied my claim. What do I do now?” It will walk you through how to read the denial, what to ask your insurer, how to prepare an internal appeal, and when Indiana external review may be available.

Before you begin, confirm what kind of plan you have. The Indiana Department of Insurance generally regulates fully insured Indiana health policies and HMOs, while many self-funded employer or union plans are regulated under federal ERISA rules through the U.S. Department of Labor. Medicaid, Medicare Advantage, Marketplace, employer, and individual plans may also have different appeal instructions and deadlines. Resolving health care insurance disputes (Indiana Department of Insurance)

Before you appeal, identify the type of denial. Different denials require different evidence.

A prior authorization denial happens before treatment, medication, surgery, imaging, or another service is approved. If your doctor requested approval and the insurer said no, this is usually a pre-service denial.

Indiana has a specific health care service prior authorization law. For plans subject to that law, prior authorization requirements and written clinical criteria must be made readily accessible online, and an insurer or utilization review entity generally must give advance notice before implementing new or amended prior authorization requirements. Indiana law also requires reporting on prior authorization approvals, denials, denial reasons, appeals, and appeal outcomes. Indiana Code § 27-1-37.5-19

Indiana prior authorization law also includes response deadlines. For covered plans, urgent prior authorization requests must generally be answered within 24 hours, and other health care service or prescription drug prior authorization requests must generally be answered within 48 hours, excluding weekends and legal holidays. If the request is denied, the response must include the specific reasons for the denial and suggested alternatives. Indiana Code § 27-1-37.5-23

For plans subject to Indiana’s prior authorization rules, your provider may also be able to request a peer-to-peer review after an adverse prior authorization determination. Indiana law says the health plan must offer a peer-to-peer review process and make every effort to complete it within seven business days after the request, assuming the necessary information has been received. Indiana Code § 27-1-37.5-17

Here is a list of common Indiana insurers and tools that can help you determine whether the service in question may require prior authorization. The Indiana Department of Insurance lists Anthem, CareSource, Cigna, Coordinated Care Corporation, and UnitedHealthcare as carriers offering individual Marketplace coverage in Indiana for 2026. Indiana open enrollment fact sheet

Indiana Medicaid managed care plans change over time. As of 2026, the Indiana Medicaid managed care program works with Anthem, CareSource, Humana, Managed Health Services, and UnitedHealthcare across programs such as HIP, Hoosier Healthwise, Hoosier Care Connect, and PathWays. Indiana FSSA has also announced that MDwise is no longer a Medicaid health plan option after January 1, 2026. Indiana Medicaid managed care health plans

If your denial says prior authorization was missing, you may still have options. Ask your insurer and provider who was supposed to request it, get the denial reason in writing, and ask whether a corrected claim, retroactive review, peer-to-peer review, or appeal can still be submitted.

If prior authorization was requested but denied, ask for the exact clinical rule, policy, or medical necessity criteria the insurer used. Then ask your doctor to submit an appeal with supporting records.

For prescriptions, the process is similar: missing prior authorization can prevent the pharmacy from filling the medication, and medical denials may need a formulary exception, step-therapy exception, or medication appeal from your prescriber.

A medical necessity denial means the insurer decided the service was not medically necessary under the plan’s rules or medical policy.

These denials often require stronger medical evidence, such as:

Medical necessity denials are especially important in Indiana because external review may be available after the insurer’s internal grievance or appeal process is completed, depending on the plan and denial type. Indiana external review applies to certain adverse determinations involving appropriateness, medical necessity, experimental or investigational treatment, and certain rescissions. Indiana Code § 27-8-29-12

Some denials say the treatment is “experimental,” “investigational,” or “not proven.” These denials are different from ordinary billing denials because they usually require medical literature, clinical studies, or a physician statement explaining why the requested treatment is appropriate.

Similar to medical necessity denials, experimental or investigational denials may be eligible for Indiana external review after the internal appeal process is exhausted, depending on the plan type. Indiana Code § 27-8-29-12

Some denials are not really about whether the care was medically necessary. They may involve:

For emergency care and certain services at in-network hospitals or facilities, federal surprise billing protections may apply. The No Surprises Act generally protects patients from many unexpected out-of-network bills for most emergency services, certain non-emergency services from out-of-network providers at in-network facilities, and out-of-network air ambulance services. CMS No Surprises Act fact sheet

Indiana prior authorization law also includes protections for emergency services. For plans subject to the law, emergency health care services necessary to screen or stabilize a covered individual are treated differently from ordinary prior authorization requests, and medical necessity for emergency services cannot be restricted more heavily just because the provider was out-of-network. Indiana Code § 27-1-37.5-24

Administrative denials can sometimes be fixed faster than medical necessity denials, but you should still watch the appeal deadline.

Common administrative issues include:

Now that we have covered common types of denials, it is time to dig deeper.

You can usually find the denial reason code and denial explanation in the Explanation of Benefits, often called an EOB. The EOB is not a bill. It explains what the insurer paid, what it denied, and what you may owe.

The Indiana Department of Insurance tells consumers to review the EOB and policy materials carefully. If a claim is denied, the EOB should explain the insurer’s decision, and the policy or certificate should explain appeal procedures. Resolving health care insurance disputes (Indiana Department of Insurance)

You should look for:

You can also call your provider’s billing office to learn more about your denial. When you call, ask:

Common denial codes can help you quickly understand what went wrong. Below are frequent examples in plain English, plus practical next steps.

Important: denial code language can vary by payer and claim system. Always ask for the exact denial code, full denial message, and payer policy reference in writing before filing your appeal.

A phone call can be helpful, but it is usually not enough to protect your rights. Ask for everything important in writing or confirm it through the insurer portal.

When you call the insurer, ask:

For many Marketplace and commercial plans, you may see a 180-day internal appeal deadline after receiving the denial notice. HealthCare.gov describes a 180-day deadline for internal appeals, and some Indiana insurer materials, such as CareSource, Ambetter from MHS, and Cigna, also reference 180-day appeal windows for many plans. Always check your denial letter because your plan type may change the deadline. HealthCare.gov internal appeals

For Indiana Medicaid managed care, the appeal deadline is often shorter. For example, CareSource Indiana Medicaid and MHS Indiana materials refer to 60-day appeal windows for Medicaid managed care denials. CareSource Indiana Medicaid appeals

Before submitting an internal appeal, gather any of the following documentation that you have:

If the denial is for medical necessity, ask your doctor to address:

If the denial is for a prescription drug, ask the prescribing doctor to address formulary alternatives, prior failed medications, side effects, contraindications, and why the requested medication is medically appropriate.

Internal appeals are usually the first formal step after a denied claim, denied prior authorization, or other adverse benefit decision.

In Indiana, the terminology can be confusing. Indiana law and Indiana Department of Insurance materials often use the word grievance for the internal complaint process and appeal of a grievance decision for the next internal review step. Many insurer letters also use the more familiar terms appeal, internal appeal, or adverse benefit determination appeal. Indiana internal and external grievance procedures

For fully insured Indiana plans subject to Indiana grievance rules, insurers must maintain written procedures for timely grievance resolution. Indiana law requires acknowledgment of a grievance within five business days, documentation and investigation of the grievance, notice of the disposition, and information about the right to appeal. If a grievance decision is appealed, Indiana law requires the appeal to be resolved as expeditiously as possible and not later than 45 days after the appeal is filed. Indiana Code § 27-8-28-16

Indiana administrative rules also set acknowledgment timing. For HMOs, acknowledgment of a grievance or appeal must be sent no more than three business days after receipt; for insurers, the general acknowledgment deadline is five business days. 760 IAC 1-59-6

Patients should follow the appeal instructions in their denial letter or EOB, include supporting records or a doctor’s letter when possible, and confirm the deadline because appeal windows vary by plan.

Common Indiana insurer appeal resources include:

When you file the internal appeal, include:

External review is when an independent review organization, not your insurance company, reviews certain final denials.

In Indiana, external review may be available for certain adverse determinations involving appropriateness, medical necessity, experimental or investigational treatment, and certain rescissions. The request is generally made in writing to the insurer after the internal appeal process, and Indiana law says the request must be filed no more than 120 days after you are notified of the insurer’s appeal resolution. Indiana Code § 27-8-29-12

Indiana external review uses an independent review organization selected from certified review organizations. The independent reviewer must avoid material conflicts of interest, and the covered person does not pay the independent review organization’s costs; the insurer pays those costs. Indiana Code § 27-8-29-13

For standard external review, the independent review organization must generally make a determination within 15 business days after the external grievance is filed. For expedited external review, the determination must generally be made within 72 hours. The external review decision is binding on the insurer. Indiana Code § 27-8-29-15

HMOs have a similar Indiana external grievance process for adverse utilization review determinations, medical necessity denials, experimental or investigational denials, and certain rescissions. HMO external review requests also generally must be filed within 120 days, and expedited review may be available when the standard timeline could seriously jeopardize the patient’s life, health, or ability to regain maximum function. Indiana Code § 27-13-10.1-1

External review is not available for every denial. For example, if the issue is only a coding error, missing information, timely filing dispute, or eligibility correction, the better path may be a corrected claim, provider billing escalation, or internal administrative appeal. Also, Indiana law says if Medicare provides an external review process for the same grievance, the person may not request Indiana external review for that same grievance. Indiana Code § 27-8-29-23

If your plan is self-funded through a private employer or union, Indiana external review rules may not apply. The Indiana Department of Insurance says many self-funded employer plans are regulated under federal law, and consumers may need to contact the U.S. Department of Labor’s Employee Benefits Security Administration for help. Resolving health care insurance disputes (Indiana Department of Insurance)

If waiting for the normal appeal process could seriously harm your health, ask for an expedited appeal.

Ask your treating doctor to document the urgency in writing. The letter should explain why waiting for a standard appeal could seriously jeopardize your life, health, ability to regain maximum function, or ability to avoid severe pain.

For prior authorization requests under Indiana’s prior authorization law, urgent requests generally must be answered within 24 hours. If a prior authorization adverse determination is issued, Indiana law also describes a process where the provider may correct the request, accept an alternative, or appeal the adverse determination, with short response timelines. Indiana Code § 27-1-37.5-23

For Indiana external review, expedited review may be available if the standard timeframe would seriously jeopardize the covered individual’s life, health, or ability to reach and maintain maximum function. Expedited external review decisions are generally due within 72 hours after the external grievance is filed. Indiana Code § 27-8-29-13

For plans subject to federal Affordable Care Act appeal rules, urgent cases may sometimes allow internal appeal and external review to proceed at the same time. HealthCare.gov explains that in urgent health situations, a person may ask for external review at the same time as the internal appeal. HealthCare.gov internal appeals

If you cannot resolve the issue with the insurer, the Indiana Department of Insurance may be able to help with plans it regulates.

The Indiana Department of Insurance says consumers should first try to resolve disputes with the insurer, then submit a written complaint if they cannot resolve the issue. A complaint should include the consumer’s name, the insurance company or agent, policy or claim number, a description of the problem, the desired resolution, and supporting documents such as correspondence, phone notes, or bills. Resolving health care insurance disputes (Indiana Department of Insurance)

However, the Indiana Department of Insurance may not regulate every plan. Self-funded employer plans, many union plans, Medicare, Medicaid, federal employee plans, church plans, and government employer plans may have different complaint or appeal channels. If you are not sure which rules apply, ask your insurer or employer: “Is this plan fully insured or self-funded, and who regulates the appeal process?”

Before submitting your Indiana health insurance appeal, make sure you have:

A denial is not always the final answer. In Indiana, many health insurance denials can be challenged, but the strongest appeal is usually specific, well-documented, and tied directly to the insurer’s stated reason for denial.