Insurance Appeal Deadlines by State: How Long You Have to File

You generally have at least 180 days from your denial notice to file an internal appeal under federal law for group health plans (29 CFR §2560.503-1). However, state-regulated plans may have different deadlines, and some states provide only 60 days. Missing your deadline means losing your right to challenge the denial — so finding your exact window is critical.

This guide covers federal minimum deadlines, state-specific timelines, and how to determine which rules apply to your plan.

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Federal Minimum Deadlines

If your plan is covered by ERISA (most employer-provided group health plans), federal law sets these minimum deadlines:

| Step | Deadline | Source | |---|---|---| | File internal appeal | At least 180 days from denial notice | 29 CFR §2560.503-1(h)(3)(i) | | Insurer responds (post-service) | Within 60 days (standard) or 30 days (expedited) | 29 CFR §2560.503-1(i)(2)(iii) | | File external review | Within 4 months of final internal denial | 45 CFR §147.136(d)(2)(i) | | External review decision | Within 45 days (standard), 72 hours (expedited) | 45 CFR §147.136(c)(2)(xii)-(xiii) |

Important: These are minimums — your specific plan may offer longer deadlines. The denial letter you received is the authoritative source for your plan's deadlines.

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Which Rules Apply to Your Plan?

Your appeal rights depend on how your plan is regulated:

1. ERISA (self-funded) plans — Follow federal minimums; your denial letter must specify your deadlines
2. Fully insured plans — May follow your state's external review process, which could offer different deadlines
3. Medicare — Separate deadlines and processes (typically 120 days for redeterminations)
4. Marketplace plans — Must follow federal external review standards under 45 CFR §147.136

Check your plan document or denial letter for the specific deadline. If it doesn't state a deadline, assume the federal minimums above.

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State-Specific Deathlines

The table below shows appeal deadlines for states with data on file. This is sourced from the same protection data used by the Hedical application itself — a single source of truth that stays in sync with the product's logic.

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What Happens If You Miss the Deadline

Missing your appeal deadline has serious consequences:

• Internal appeal: You lose the right to challenge the denial through your plan's formal process
• External review: You forfeit your right to independent review
• Subsequent claims: The same denial reason may apply to future claims for the same service
• Legal action: Some states limit your ability to sue if you did not exhaust the administrative appeals process

If you believe you missed a deadline for good cause (e.g., medical incapacity), you may request a late appeal. Insurers are not required to grant it, but some will accept late appeals with a reasonable explanation.

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What to File and How

For practical steps on reading your denial notice and filing an effective appeal, see:

• How to Read an EOB guide — understanding your denial notice
• CO-50 Denial Code guide — step-by-step appeal process

In general, your appeal packet should include:

1. Cover letter — Stating the claim number, denial date, and that this is an internal appeal
2. Letter of Medical Necessity — From your provider explaining why the service was necessary
3. Medical records — Supporting the medical necessity of the service
4. Plan document excerpts — Showing that the service is covered (if disputing a coverage exclusion)

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How Hedical Can Help

Upload your denial letter to the Medical Bill & Denial Navigator. Our AI will check your appeal deadline against federal and state rules and draft a tailored appeal letter.

Try the Bill & Denial Navigator — free for basic analysis.

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Sources

• 29 CFR §2560.503-1 — ERISA claims procedure (internal appeal deadlines)
• 45 CFR §147.136 — External review standards (ACA)
• CMS State Surprise Billing Profiles
• National Association of Insurance Commissioners (NAIC) — Uniform External Review Model Act
• State insurance department regulations (varies by state)