How to Appeal a Health Insurance Denial in Indiana

Written by Aptiva Health Editorial Team · Reviewed by Taylor Sorrels, Esq. and Crystal Brake, RCM Director · Editorial & review standards · How we research

If your health plan denied care in Indiana, you can ask the plan to reconsider. Indiana calls this a grievance. If the plan still says no, you can often ask for an external grievance, where an independent reviewer decides.

This guide explains Indiana’s steps for health insurance and for workers’ compensation. It is part of the Coverage & Appeals Center, which covers the full process for any state.

First: which rules apply to your plan?

Indiana’s grievance rules apply to state-regulated plans. These include most individual and family plans and plans that employers buy from an insurance company (fully insured plans). The rules come from Indiana Code:

• IC 27-8-28 — internal grievance procedures
• IC 27-8-29 — external grievance procedures
• IC 27-13-10 and 27-13-10.1 — grievance and external review rules for HMOs

Some plans follow federal rules instead:

• Self-funded employer plans (ERISA) generally use the federal external review process, not Indiana’s (29 CFR 2590.715-2719(c)).
• Medicare and Medicare Advantage follow federal Medicare appeal rules (Medicare.gov).
• Medicaid managed care in Indiana has its own appeal and fair hearing steps (IHCP).
• Workers’ compensation follows a separate state process, covered below.

Not sure which you have? Ask your HR department or call the number on your insurance card.

Indiana health insurance appeals at a glance

Your denial letter may list a different deadline. Use the earliest one and confirm it with your plan.

Step 1: The internal grievance

A grievance asks your plan to review the denial again.

1. Read the denial letter. Copy the exact reason and find any deadline.
2. Get the plan’s criteria. Ask for the medical policy used and a copy of your claim file (29 CFR 2560.503-1(h)(2); 45 CFR 147.136(b)).
3. Ask your clinician for a letter. It should answer the denial reason point by point.
4. Gather your records. Visit notes, test results and treatment history.
5. File the grievance. Follow the instructions on the denial letter. Keep proof of filing.
6. Ask for an expedited review if urgent. Say “expedited” clearly. Indiana sets no deadline; federal rules allow most plans 72 hours (29 CFR 2560.503-1(i)(2)(i)).
7. Watch for the decision. Indiana plans must resolve grievances within 20 business days after they have the information they need (IC 27-8-28-16).

For help with what to send, see:

• Denied as “not medically necessary”
• Denied for missing prior authorization

Step 2: The external grievance

If the plan upholds its decision, you can ask for an external grievance. An independent review organization (IRO) reviews your case. It does not work for your insurer.

How to ask

• Ask through your insurer (IC 27-8-29-13).
• Ask within 120 days of the plan’s decision.
• The IRO decides within 15 business days, or 72 hours for expedited cases (IC 27-8-29-15).

What it covers

External grievances in Indiana are used for denials based on medical judgment, such as “not medically necessary” or “experimental,” and for policy cancellations (rescissions) (IC 27-8-29-12).

1. Get the plan’s grievance decision in writing. Note the date. Your 120-day window starts from it.
2. Ask your insurer for its external review request form.
3. Attach your evidence. Your clinician’s letter, records, and all denial and grievance letters.
4. Send it to your insurer and keep proof you sent it.
5. Ask for expedited review if urgent.
6. Track the decision. Follow up if you don’t hear back within the timeline.

What happens after

If the IRO sides with you, your plan must follow the decision (IC 27-8-29-16).

[Your name]
[Your address] · [Your phone] · [Your email]

[Date]

[Insurer name] — External Grievance Requests
[Address from your grievance decision letter]

RE: Request for external grievance (Indiana Code 27-8-29)
Member name: [Name] · Member ID: [Number]
Claim / reference number: [Number]
Service denied: [Service]
Date of grievance decision: [Date]

To whom it may concern:

I request an external grievance review of your decision to deny [service]. Your letter dated [date] says: "[exact reason]."

I believe this care is medically necessary. Enclosed are:
- Letter of medical necessity from [clinician]
- Medical records from [dates]
- Your grievance decision and original denial letter
- Your medical policy, with the criteria I meet marked

[If urgent:] My clinician believes delay would seriously harm my health. I request an expedited review.

Please confirm receipt in writing and tell me which independent review organization is assigned.

Sincerely,
[Signature]
[Printed name]

If you are in an HMO

Indiana has separate grievance and external review rules for health maintenance organizations (HMOs), in IC 27-13-10 and IC 27-13-10.1. The overall steps are similar: an internal grievance with the HMO, then an external review by an independent reviewer. Timelines differ slightly: HMOs resolve grievances within 20 business days of filing, and external review is requested within 120 days (IC 27-13-10-7; IC 27-13-10.1-2).

Check your insurance card or plan documents. If it says “HMO,” ask the plan which grievance rules apply to you.

What happens during the external grievance

Once your insurer receives your request, an independent review organization (IRO) takes the case (IC 27-8-29-13). Here is what to expect.

• Assignment. An IRO is assigned to your case. It does not work for your insurer.
• Records. Your insurer sends the IRO your file. You can send more information that supports your case throughout the review (IC 27-8-29-14).
• Review. A reviewer with relevant clinical training looks at your records and the plan’s criteria.
• Decision. The IRO decides within 15 business days, or 72 hours if expedited. You and your insurer get the decision in writing (IC 27-8-29-15).
• After the decision. If the IRO sides with you, your plan must follow it (IC 27-8-29-16).

Because the IRO may decide quickly, send your strongest evidence with the request: your clinician’s letter and the records that answer the denial reason.

Medicare, Medicaid and Marketplace plans in Indiana

If you have a Medicare Advantage or Indiana Medicaid managed care plan, the 2026 federal prior authorization rule applies. These plans must decide urgent prior authorization requests within 72 hours and standard ones within 7 calendar days, and must give a specific reason for a denial. Federal-exchange Marketplace plans must also give a reason, but those deadlines don’t apply to them (CMS-0057-F fact sheet). Their appeal steps after a denial differ from the state-regulated plan process above.

An Indiana appeal, start to finish

*This is an illustrative example, not a real patient. Timelines are for a state-regulated plan.*

• June 2: Morgan, who lives in Jeffersonville, gets a letter denying more physical therapy visits.
• June 5: Morgan asks the plan for its therapy policy and asks the therapist for a letter with progress measurements.
• June 16: Morgan files an internal grievance with the letter and progress notes. Morgan keeps proof of filing.
• By July 14: The plan resolves the grievance (within its 20-business-day window). It upholds the denial.
• August 10: Morgan asks for an external grievance through the insurer, well inside the 120-day window.
• Within 15 business days: The independent review organization decides (IC 27-8-29-15).

If Morgan’s situation had been urgent, Morgan could have asked for an expedited external review, decided within 72 hours.

Checklist for your external grievance request

• The plan’s written grievance decision (copy)
• Ask your insurer for its external review request form
• Letter of medical necessity from your clinician
• Medical records that answer the denial reason
• The plan’s medical policy with the criteria you meet marked
• Your grievance letter (copy)
• Proof of sending

Common mistakes in Indiana appeals

• Waiting too long after the grievance decision. Mark the 120-day deadline the day the decision arrives.
• Sending the request to the state instead of the insurer. In Indiana you request the external grievance through your insurer.
• Using the state process for a self-funded plan. Self-funded employer plans generally use the federal process (29 CFR 2590.715-2719(c)).
• Missing the 2-year workers’ comp filing window. Work injuries have their own deadlines (IC 22-3-3-3).
• Assuming HMO rules are the same. HMOs have their own chapters of Indiana law (IC 27-13-10).

Self-funded employer plans in Indiana

If your employer’s plan is self-funded, Indiana’s external grievance process may not apply. Self-funded plans generally use the federal external review process. Under the federal rule, you have at least 180 days for an internal appeal and 4 months after a final internal denial to ask for external review (29 CFR 2560.503-1(h)(3)(i); 45 CFR 147.136(d)).

Who to call in Indiana

The Department can answer questions about state-regulated plans and take complaints.

Workers’ compensation appeals in Indiana

If you were hurt at work, your care usually goes through workers’ compensation. Indiana’s process is run by the Worker’s Compensation Board of Indiana.

The Indiana workers’ comp ladder

Workers’ comp disputes can be complex, and many people get legal advice. This page is not legal advice.

Car crash injuries in Indiana

If you were hurt in a car crash, your auto policy’s medical payments coverage, if you have it, may pay for some care (IDOI).

Tips that help Indiana grievances succeed

• Answer the exact denial reason.
• Send the plan’s criteria with the parts you meet marked.
• Get your clinician’s letter.
• Mark the 120-day external grievance deadline as soon as the plan decides.
• Keep a call log and proof of everything you send.
• Ask for expedited review when waiting could harm your health.

How Aptiva helps Indiana patients

Aptiva Health’s team handles prior authorization and appeals for our patients in Indiana.

If coverage doesn’t work out, see Aptiva’s cash-pay options.

Getting care in Kentucky? See how to appeal in Kentucky.