Major Medical Plan Appeal Rights Explained
What Is Major Medical Health Insurance?
Key Takeaway: Major medical plans cover a broad set of hospital, physician, drug, and preventive services under a deductible, coinsurance or copays, and an out-of-pocket maximum. They are not open-ended promises to pay for every treatment your doctor recommends.
Employer group plans, ACA marketplace policies, and most individual commercial policies are major medical coverage. When a claim is denied, the insurer is usually applying a rule from your plan document, not rejecting the idea that you needed care.
Typical covered service categories include:
- Inpatient and outpatient hospital services, including emergency department care
- Physician and specialist visits, including telehealth where the plan allows it
- Diagnostic testing and imaging, often with prior authorization requirements
- Prescription drug benefits administered through a pharmacy benefit manager
- ACA-required preventive services at no cost-sharing for non-grandfathered plans
Common denial triggers include missing prior authorization, out-of-network care without an exception, benefit exclusions, and medical necessity disputes. Your Explanation of Benefits and denial letter should name the specific reason code and plan provision applied.
Where Do You Find Your Plan's Coverage Rules?
Key Takeaway: Your Summary Plan Description, Evidence of Coverage, and denial letter define what is covered, what is excluded, and how appeals must be filed. A strong appeal shows your case meets the same criteria the plan cited in the denial.
For employer-sponsored coverage, request the Summary Plan Description (SPD) from HR or the plan administrator. For marketplace or individual plans, download your Evidence of Coverage from the insurer portal. Focus on these sections:
- Schedule of benefits, including deductibles and out-of-pocket maximums
- Exclusions and limitations for services not covered regardless of medical necessity
- Prior authorization requirements and how to request them
- Appeal and grievance procedures, including deadlines and submission channels
- Medical necessity definitions and any referenced clinical policies
When the denial cites a medical policy section, quote that section in your appeal and show how your clinical record satisfies each listed criterion. Generic requests that ignore the cited policy language rarely address what the reviewer must decide.
How Do Coverage Rules Lead to Claim Denials?
Key Takeaway: Major medical denials usually fall into a small set of categories: medical necessity, prior authorization, network status, coding or billing errors, and benefit exclusions. The denial reason code on your EOB tells you which evidence to gather.
| Denial type | What the plan is saying | What to attach |
|---|---|---|
| Medical necessity | Service does not meet plan clinical criteria | Provider letter, notes, guideline citations, failed conservative care |
| Prior authorization | Required approval was not obtained before service | Auth request history, urgency rationale, retro-auth request if allowed |
| Out-of-network | Provider is not in network and no exception applies | Network exception request, continuity-of-care records, referral proof |
| Benefit exclusion | Service is not a covered benefit under your plan design | SPD section review; appeal only if misapplied or miscoded |
Pull up your denial letter and EOB. Find the CARC/RARC remark codes and cross-reference them with the plan medical policy on the insurer website or by calling member services. For help reading the codes, see how to read an EOB.
What Appeal Rights Do ACA Plans Give You?
Key Takeaway: Non-grandfathered ACA individual and group market plans must offer internal appeals and external review under ACA Section 2719. Healthcare.gov describes both steps, including when an independent reviewer's decision is binding on the insurer.
Healthcare.gov appeal guidance explains that if your marketplace or other ACA-regulated plan denies a claim or prior authorization, you can request an internal appeal and, if needed, external review by an independent organization. Federal rules in 45 CFR 147.136 set decision timeframes, notice requirements, and external review standards for qualifying plans.
Your denial notice should list how to file, the deadline, and what documents to include. For the independent step after internal appeals end, see what is an external review in health insurance.
What Appeal Rights Do ERISA Employer Plans Give You?
Key Takeaway: Most private-sector employer group health plans governed by ERISA must provide written claims and appeals procedures, specific decision timeframes, and access to documents relied on in a denial. The Department of Labor publishes participant-facing materials that explain those rights.
The Department of Labor claims publication tells participants how to file a claim, what to do when a claim is denied, and how to appeal. Federal claims procedure rules in 29 CFR 2560.503-1 require ERISA group health plans to establish a full and fair review procedure, including at least 180 days from notice of denial to file many internal appeals unless your notice gives you longer.
ERISA generally covers employer-sponsored group health plans offered by private-sector employers. It does not cover Medicare, Medicaid, or most individual marketplace plans. For deadline specifics, see ERISA appeal deadline for health insurance.
How Do You File an Internal Appeal on a Major Medical Plan?
Key Takeaway: A complete internal appeal packet sent to the correct address before the deadline is the foundation for every later step, including external review on qualifying plans.
- Circle the appeal deadline on your adverse benefit determination. Deadlines vary by plan type and are printed on the notice.
- Request claim-related documents the plan relied on, including internal medical policies when your plan type allows access.
- Ask your treating provider for a letter that addresses the specific denial reason and cites accepted clinical guidelines where relevant.
- Assemble supporting records: visit notes, test results, prior authorization correspondence, and proof of failed conservative treatment if cited in the denial.
- Write and submit your formal appeal letter with member ID, policy number, claim number, date of service, provider NPI, and a clear request for internal review.
- Submit through the channel on your denial letter and keep confirmation numbers, fax sheets, or portal screenshots.
- If denied again, read the final notice for external review instructions before the next deadline passes.
For letter structure and required fields, see how to write an insurance appeal letter.
Weak vs. Strong Appeal Language
Key Takeaway: Reviewers approve appeals backed by plan-specific evidence and the correct appeal rights language, not general complaints about premiums or frustration with the insurer.
| Weak statement | Strong statement |
|---|---|
| “I have major medical insurance and my doctor ordered this test. Please cover it.” | “I request internal appeal for claim denied under medical necessity on 04/12/2026. Attached: provider letter citing the plan's imaging policy criteria, physical therapy notes showing failed conservative treatment, and MRI report confirming the cited diagnosis.” |
| “This denial is unfair. I pay premiums every month.” | “I request review of the adverse benefit determination dated 05/01/2026 under the plan's ERISA claims procedures. The denial cites medical policy Section 3.2. My physician's letter demonstrates each criterion in Section 3.2 is met.” |
| “Can someone please look at my claim again?” | “Following internal appeal denial dated 06/15/2026, I request external review under ACA Section 2719. Member ID and claim number are listed above. Attached: operative indication letter and specialist consultation notes for the denied outpatient procedure.” |
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ERISA vs. ACA vs. Medicare: Appeal Rights Compared
Key Takeaway: Your appeal rights depend on which law governs your plan. ERISA employer plans, ACA marketplace plans, and Medicare each have different deadlines, review levels, and external review options.
| Plan type | Governing law | Typical filing window | External review |
|---|---|---|---|
| Employer group (ERISA) | 29 CFR 2560.503-1 | Often 180 days from notice; check SPD | May be available after internal appeals per plan and DOL ACA coordination |
| ACA marketplace / individual | ACA Section 2719 / 45 CFR 147.136 | Deadline on denial notice | Independent review; binding when eligible under Healthcare.gov rules |
| Medicare Advantage | Medicare claims and appeals rules | Redetermination deadline on Medicare notice | QIC reconsideration and further Medicare levels, not ACA IRO review |
Not sure which category your plan falls into? Check your insurance card and SPD. Plans purchased on Healthcare.gov are ACA-regulated. Medicare cards show Medicare and your plan contract number. For a side-by-side look at internal and external steps, see internal appeal vs external review.
What If You Miss a Deadline or Get Denied Twice?
Key Takeaway: Missing an internal appeal deadline can limit later options on many plans. After a second denial, external review on qualifying ACA plans or a state insurance department complaint may still be available depending on your plan type and state rules.
Calling member services without filing a written appeal does not start the formal review clock or preserve the rights described in your denial notice. You must submit a written appeal with supporting documentation through the channel listed on the letter.
If internal appeals are exhausted on a qualifying plan, request external review using the instructions on your final denial. For timing across plan types, see how long you have to appeal a health insurance denial. For repeated denials, see what to do when insurance denies a claim twice.
Check the card and the notice. A Medicare card means Medicare.gov appeal levels, not ACA external review. A marketplace plan ID means ACA Section 2719 may apply. Never assume one plan type's rules apply to another.
Frequently Asked Questions
Common questions about major medical coverage rules and appeal rights under ACA and ERISA.
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Disclaimer: This article is for educational purposes only and does not constitute medical or legal advice. AppealFlow is not a healthcare provider or law firm. Deadlines and appeal rights vary by plan type and state. Always review appeal letters with your physician before submission. For medical emergencies, call 911. See our full disclaimer.