Claim Denied? The Order the Appeals Run In, and Which Rulebook Sets Your Deadlines

A denial letter is an administrative document, not a verdict. It is also the start of a clock that most households do not notice running. The useful work in the week after a claim is refused is not arguing. It is figuring out which set of rules your plan sits under, because that single fact determines your deadlines, who hears the appeal, and whether anyone outside the insurer ever reads the file. Get the order wrong and you can spend four months on the route that has no authority to overturn anything.

What follows compares the routes side by side, in the sequence they actually run, and notes where the rules have shifted in the last few years and why that shift favors the person appealing.

Step zero: identify the rulebook, because it sets everything else

Three broad categories cover most denials, and they behave differently.

Employer-sponsored coverage. If your insurance comes through a job, the claims and appeals procedure is governed by federal law under ERISA, which the Department of Labor is responsible for administering. That regime sets response deadlines, requires the plan to tell you the specific reason for a denial, and gives you the right to the documents the decision rested on. It matters whether the employer plan is fully insured (the carrier bears the risk, and state insurance law also applies) or self-funded (the employer bears the risk, and state insurance regulators generally cannot touch it). The insurance card usually does not say. Human resources or the summary plan description will.

Individual and marketplace coverage. Plans bought directly or through an exchange sit under state insurance law plus the federal appeal protections that came with the Affordable Care Act, including a right to independent external review.

Medicare and Medicaid. These run on their own ladders with their own names for each rung. Medicare Advantage denials, in particular, follow a defined sequence of reconsideration, independent review, and beyond, with tighter timelines for anything urgent.

Two minutes spent on this question saves weeks. A self-funded employer plan complaint filed with a state department of insurance typically comes back with a polite note explaining that the agency has no jurisdiction, and by then a month is gone.

The internal appeal, and why the written request outperforms the phone call

Almost every route requires you to exhaust the plan's own appeal first. This is the rung people skip or treat casually, and it is the rung where most reversals happen, because a large share of denials are coding and paperwork problems rather than genuine coverage disputes: a missing referral, a diagnosis code that does not match the procedure code, a service billed as elective that was documented as urgent, an out-of-network designation applied to a provider who was in network on the date of service.

The written appeal beats the phone call for a simple reason. The phone call does not become part of the record that a later reviewer reads. Under the federal appeal rules for group and marketplace plans, a claimant is entitled to see the internal guidelines, the medical necessity criteria, and any expert opinion the plan relied on. Requesting those documents in writing is what turns a vague denial into a specific one you can answer.

Typical shape of the timeline, though your plan documents govern:

Situation	Plan's decision window	Your window to file
Urgent care, treatment not yet received	Days, sometimes 72 hours	File immediately, expedited
Pre-service denial (prior authorization)	Weeks	Usually 180 days from denial
Post-service denial (bill already incurred)	Weeks	Usually 180 days from denial

One clause worth knowing: if the plan blows its own deadline or fails to follow the required procedure, you may be treated as having exhausted the internal appeal and can move to external review without waiting. That provision exists precisely because delay used to be an effective defense.

External review, regulator complaint, and dispute resolution are not substitutes

Once the internal appeal is final, the routes diverge. They are often discussed as alternatives. They are not.

External review

An independent review organization, with reviewers who have no financial relationship to the plan, looks at the same file and can overturn the denial. The decision binds the plan. This is the only route in the ordinary sequence where an outside party has the power to reverse a medical necessity or experimental-treatment determination. The request window is commonly four months from the final internal denial, and expedited external review exists for urgent cases, sometimes running in parallel with the internal appeal. Note the limit: external review addresses medical judgment and certain coverage rescissions, not contract terms that plainly exclude the service.

State department of insurance complaint

Valuable for state-regulated plans, especially where the problem is conduct rather than clinical judgment: unanswered correspondence, missed statutory deadlines, network directories that listed a provider who was not in network. Regulators can compel a response and, over time, act on patterns. They generally do not sit as a medical referee.

Surprise billing dispute resolution

A distinct track for a distinct problem. Under the federal No Surprises Act, which took effect in 2022, out-of-network emergency care and certain out-of-network care delivered at in-network facilities are protected from balance billing, and the payment fight moves to an independent dispute resolution process between the provider and the plan rather than landing on the patient. There is also a route for uninsured and self-pay patients whose final bill substantially exceeds the good faith estimate they were given. If your denial is really a balance bill, appealing coverage is the wrong door.

Litigation or counsel

Last, and normally only after exhaustion, because courts reviewing employer plan decisions typically look at the administrative record you built earlier. What you put in the internal appeal is what a judge eventually reads.

What changed recently, and why it helps the person appealing

Three shifts are worth building your approach around.

Balance billing moved off the patient. The No Surprises Act rerouted the most common category of shocking medical bill into a payer-provider process. Fewer of these bills now belong in an appeal at all, which is a better outcome than winning one.

Prior authorization is being timed and documented. Federal rules finalized in 2024 push many plans, including Medicare Advantage and managed Medicaid, toward faster prior authorization decisions, electronic submission through standardized interfaces, and specific stated reasons when a request is denied. Compliance dates run into 2026 and 2027. The reasoning behind the change was straightforward: denials without a stated basis are almost impossible to answer, and delay in a pre-service decision is itself a form of denial.

Medical necessity criteria got narrower rules. Recent guidance has tightened how plans may use internal or proprietary criteria to deny care that the underlying coverage rules allow. In practice this means asking for the exact criterion applied is now a stronger move than it was five years ago.

Together these changes reward the same behavior: get the denial in writing with a specific reason, ask for the criteria, and keep the file in one place.

The practical sequence

1. Read the denial for the reason code and the deadline. Note both dates on a calendar.
2. Confirm the rulebook: employer plan (fully insured or self-funded), individual or marketplace, or Medicare or Medicaid.
3. Check whether the bill is really a surprise or balance bill. If so, use the dispute resolution route.
4. Call the billing office and ask them to verify codes before you appeal. Coding fixes resolve quickly.
5. File the internal appeal in writing. Request the criteria and any expert opinion relied on.
6. If it is refused, file for external review inside the window, and file a regulator complaint in parallel if conduct is the issue.
7. Only then consider counsel, with the record you have assembled.

The appeal that succeeds usually looks unremarkable: a dated folder, a copy of every letter, the plan's own criteria quoted back at it, and a filing that landed inside the window. The rules have moved steadily toward requiring plans to say what they decided and why, which is the raw material an appeal is built from.