Where to start
How the process works, the call that comes before it, how to assemble the file, and what to ask on the phone.
How a health insurance appeal actually works, start to finish
An appeal has three stages: an internal appeal decided by the plan, an external review decided by an independent organization, and, if the plan misses its own deadlines, deemed exhaustion that lets you skip ahead. For employer and marketplace plans the floor is 180 days, counted from when the notice reached you.
Deadline. For employer, marketplace and individual plans: at least 180 days from RECEIPT for the internal appeal, then four months from the final internal denial for external review. Both count from when the notice reached you. Medicaid and Medicare run on different, shorter clocks — see below.
Applies to Employer, marketplace and individual plans. Every other kind of coverage runs its own appeal process on its own clock, and the deadline block below says which one is yours.
The peer-to-peer call, and why it comes before your appeal
A peer-to-peer is a short call between your own clinician and the plan's reviewing doctor. It usually has to happen before you file a formal appeal, because most plans close it once the case moves into appeal. Done in time, it can reverse a denial without spending an appeal level.
Deadline. Before you file. The window is set by your plan rather than by regulation for most plans, and many stop offering a peer-to-peer once an appeal is filed, so ask on the day the denial arrives rather than after you have drafted anything.
Applies to Denials that turned on clinical judgment — medical necessity, experimental, or a prior authorization. Not paperwork denials, and not a written exclusion, where there is no clinical question to discuss.
How to build an appeal packet that gets read
An appeal is not one letter, it is a file that grows. File on time with what you have, then supplement it with dated addenda as evidence arrives. Each one repeats your identifiers, names a single subject, and preserves everything already filed. The record is what later readers inherit.
Deadline. File the appeal itself before the deadline on your letter, even if it is thin. Addenda attach to a filed appeal. They cannot rescue one you never filed.
Applies to All plan types, though the appeal clock is not the same for all of them — check the deadline block below. Most useful on a denial with a deadline attached, where waiting to assemble something perfect is the real risk.
What to ask when you call your insurer
What you are told on the phone is not binding, and the recorded disclaimer at the start of the call says so. Call anyway: a representative will tell you the reviewer's rationale, the expedited criteria, and where to send things. Then get the parts that matter in writing.
Applies to All plan types, though the appeal clock is not the same for all of them — check the deadline block below. The escalation paths differ, but the questions and the submission problems are the same everywhere.
The arguments
The specific things that change a reviewer's mind, and the evidence each one needs.
Proving no in-network provider is actually available to you
A network directory listing is not the same as a provider who can actually do your procedure. Availability means available to you, within a clinically reasonable time, without prerequisites you cannot meet. Document each provider you contacted, and the record you build becomes the evidence the reviewer reads.
Deadline. Build this before you file, not after. It is the exhibit your appeal rests on, and adding it later means filing a second time.
Applies to Gap exception, network adequacy, and single case agreement requests, on any plan type.
Using mental-health parity to challenge a gender-affirming care limit
Parity law says a plan cannot impose harder limits on mental health and substance use care than on comparable medical and surgical care. Where gender-affirming care is reviewed under a behavioral-health criterion, that can matter. You can demand the plan's written comparative analysis, and that obligation is still in force.
Applies to Group health plans and issuers subject to federal parity rules. This is an advanced argument; exhaust the ordinary appeal first.
The No Surprises Act protection your surgeon cannot ask you to waive
At an in-network facility, an out-of-network provider must normally charge you in-network cost sharing. They can usually ask you to waive that in advance, but not when no participating provider can perform the service at that facility, and never for anesthesia or assistant surgeons.
Applies to Non-emergency services by a non-participating provider at a participating facility. The protection does not depend on whether you chose the provider.
Using published rate files to argue an out-of-network payment
Insurers must publish machine-readable files listing what they have agreed to pay each provider. If your plan is offering an out-of-network surgeon far less than it pays in-network surgeons for the same procedure codes, those files are where you find the number to argue with.
Applies to Advanced. Most useful when negotiating a single case agreement or disputing an out-of-network allowed amount.
When getting worse while you wait is used against you
Surgical guidelines often ask that mental health conditions be stable and treated. If waiting for a denied claim made you worse, that decline is a consequence of the denial, not evidence against the surgery. Say so explicitly, and ask your clinician to date the baseline against the current record.
Applies to Any denial where a clinical guideline includes a stability or readiness criterion.
The mechanisms
The formal routes: independent review, skipping ahead when the plan misses its own deadlines, and the agreement people miss.
External review: how an independent reviewer can overturn your insurer
External review sends your denial to an independent review organization with no financial relationship to your plan. Their decision binds the insurer. It is usually free to you, it runs on a fixed timeline, and it is the single most effective step available on a medical-necessity denial.
Deadline. For employer, marketplace and individual plans: four months from the date you receive the final internal denial. There is no appeal from missing it. Medicaid and Medicare do not use this process at all, and their windows are shorter — check below before you count.
Applies to Non-grandfathered employer, marketplace and individual plans. Availability and route differ for self-funded plans; check your denial letter. Every other kind of coverage uses its own process instead — the deadline block below says which.
Deemed exhaustion: when a plan's own delay lets you skip ahead
Deemed exhaustion means that when a plan fails to follow the required claims and appeals process, you may treat the internal appeal as finished and move straight to external review or court. It exists so a plan cannot trap you by simply never deciding.
Deadline. The plan's own deadlines are what trigger this: if it misses them, you may proceed as though you had exhausted the internal process. Your external-review clock still runs from that point.
Applies to Non-grandfathered plans subject to the federal claims and appeals rules. Ask about the exact standard for your plan.
Single case agreements: an approval is not a promise to pay
A single case agreement is a contract between your plan and an out-of-network surgeon setting what the plan will pay for your procedure. A prior authorization is not one. People have paid tens of thousands of dollars on an approval that was never an executed payment agreement, and never been reimbursed.
Deadline. No fixed deadline of its own, but it runs alongside your appeal — so the 180-day internal-appeal window from receipt is still the clock that matters.
Applies to Any plan where your surgeon is out of network. Insurers also call these letters of agreement.
Running your appeal and a regulator complaint at once
The internal appeal is one channel, not the only one. Depending on your plan type you may also reach a state insurance department, a federal regulator, and the employer that actually pays your claims. Run them at the same time. Each one adds to the record the next one reads.
Deadline. The internal appeal deadline governs everything else. File that first, then open the other channels while it is pending. Nothing here is a reason to let the appeal clock run.
Applies to All plan types, but which channels exist depends on the type. Work out your plan type first.
What to gather
The two records that do the most work, and both take time to build.
Surgery letters: surgeon-specific, procedure-specific, and they expire
Letters supporting surgery are usually written for a specific surgeon and a specific procedure, and they do not transfer. Plans also treat them as expiring, and the window is often twelve months from signature to submission. Check both before assuming the letter you have will work for the surgery you are scheduling.
Deadline. Letters expire against the SUBMISSION date, not the surgery date. One major insurer's guideline requires the signature within twelve months of the request being submitted, which is shorter than the eighteen months commonly repeated.
Applies to All plan types, though the appeal clock is not the same for all of them — check the deadline block below. Requirements vary by plan, by surgeon, and by state, and some state Medicaid programs ask for only one letter.
Keeping a contact log, and why it wins appeals
A contact log is a dated record of every call, name, reference number, and answer. It is unglamorous and it is often the strongest evidence in an appeal, because the plan has a record of every conversation, and if you do not, disputes about what you were told resolve their way.
Applies to All plan types, though the appeal clock is not the same for all of them — check the deadline block below. Most decisive on gap exceptions and procedural denials.
When it goes further, and what comes after
Getting a lawyer is narrower and cheaper than people think. And winning is not the same as being paid.
Getting a lawyer, and what it can actually cost
A lawyer for a coverage fight can be narrower and cheaper than you think. Limited scope representation covers one specific thing rather than the whole matter, and a declaratory action asking a court to say what the plan means can move in weeks. Ask about both before assuming you cannot afford it.
Applies to Anyone facing a denial with a date attached. Most relevant where a plan is exempt from ERISA, which widens the remedies available in state court.
After you win: the claims can still be wrong
An approval or a single case agreement is not payment. Claims can auto-adjudicate before the agreement reaches the claims system, come back marked out of network, and land in the wrong accumulator. Check the total allowed across every segment against the agreed amount before you panic or celebrate.
Deadline. Claim disputes have their own deadlines, usually shorter than appeal deadlines and printed on the explanation of benefits. Winning the coverage argument does not reset them.
Applies to Anyone who won an appeal, a gap exception, or a single case agreement, and is now reading explanations of benefits.
Last updated 2026-08-08 · Not legal or medical advice