How to Actually Appeal an Insurance Denial

Insurance denied your mental health claim. Maybe it was a therapy session, maybe a med refill, maybe a higher level of care like an IOP or a residential stay. The letter shows up full of jargon and it feels like the end of the story, but it’s really just the start. Most guys lose because they read the first line and quit. You win by reading the whole thing, matching the instructions, and not letting the paperwork die in a drawer.

This is a walkthrough of what to actually do when a mental health claim gets denied in Oregon or Washington. Internal appeals, external review, the parity laws insurers pretend not to know about, the ERISA route if your plan is through a self-funded employer, and when it makes sense to get a lawyer involved. If you have ever stared at one of these denial letters and felt your stomach drop, this is for you.

Read the whole damn letter twice with a pen

The first move is boring and most people skip it. Read the whole damn letter twice with a pen, because the missing pieces are your leverage. Insurance denial letters are legally required to contain specific information, and if any of it’s missing or vague, that itself is grounds for a successful appeal.

Here is what you’re looking for. A reason code, which is usually a short alphanumeric string the insurer uses internally to categorize why they said no. A plain-language explanation of the reason, which should reference the specific section of your plan document they’re relying on. The clinical or administrative criteria they used to make the decision, sometimes called the medical necessity criteria or the utilization management guidelines. Your right-to-appeal language, which has to include the deadline to file an internal appeal, the address or portal to send it to, and your right to receive the documents the insurer used to make the denial. That last point matters, you can request the full file and they have to give it to you, usually within thirty days.

If the letter is missing any of these elements, write that down. You will use it later. A denial that fails to include the required disclosures is procedurally defective, and a procedurally defective denial is a very strong appeal angle in its own right.

The denial reasons you will actually see

Mental health denials mostly fall into a few buckets, and once you spot which one you’re in the rest gets straightforward.

You see medical necessity a lot. The insurer says the care you got, or the care you want, isn’t necessary at that level. This is the denial most people get for residential treatment, partial hospitalization, intensive outpatient, and sometimes for longer-term therapy. It is also the denial most often overturned on appeal, because medical necessity is a clinical judgment and the reviewer who denied you usually has less context than your treating clinician.

Insurance screwups hit different when the provider sits outside your network. Either the doc isn’t in your plan, the plan won’t touch anything out of network, or the in-network rate still leaves you holding a bigger bill than you planned. If you went out of network because there were no in-network providers available within a reasonable distance or wait time, that’s a separate issue called network adequacy, and in Oregon and Washington both, the state regulators take it seriously.

Prior auth is the dumb administrative version. Some services, especially higher levels of care and certain medications, need approval before they happen, even when the care itself makes sense. If your clinician didn’t get the prior auth, or got it for the wrong service, the claim gets denied even if the care was completely appropriate. This is usually fixable by having the provider submit a retroactive authorization request with clinical documentation.

Your plan caps the sessions or days or total dollars, and once you hit that wall you’re done. Worth knowing, hard caps on mental health benefits that don’t also apply to physical health benefits are illegal under federal parity law, and we’ll get to that.

Most guys have no clue what parity even means, let alone how to hit it. If your plan covers physical health care more generously than mental health care, whether through stricter prior auth, lower session limits, narrower networks, or higher cost sharing, that may be a federal violation regardless of what the denial letter actually says. More on this in a minute.

Internal appeal, level one, the workhorse step

Every fully insured health plan in the United States is required to offer at least one level of internal appeal. Most offer two. The internal appeal is your first formal pushback and you have to do it before you can escalate anywhere else, with rare exceptions for urgent care situations.

The deadline to file is usually between thirty and one hundred eighty days from the date of the denial letter. Read the letter, the deadline is in there. If yours is on the shorter end, like thirty or sixty days, calendar it the day you get the letter. Do not wait.

What you write matters. A good internal appeal letter has four parts. First, a clear statement that you’re appealing, with the claim number, date of service, provider name, and the reason given for the denial. Second, your argument for why the denial is wrong, written in plain language, ideally referencing specific provisions of your plan document. Third, the evidence you’re attaching, which is the most important part. Fourth, a clear ask, meaning what you want them to do, usually approve the claim, reprocess at the in-network rate, or reverse the denial.

Evidence is where most appeals get won or lost. Attach a letter of medical necessity from your treating clinician, written specifically for this appeal, not just a copy of their progress notes. Attach the relevant clinical documentation, like assessment, treatment plan, progress notes, and any standardized measures showing severity. Attach published clinical guidelines from organizations like the American Psychiatric Association, the American Society of Addiction Medicine if it’s substance use related, or the relevant specialty society, showing that the level of care you got matches the standard for your presentation. If parity is in play, attach a clear written statement of why you believe parity is being violated and request the insurer’s nonquantitative treatment limitation analysis, which is a document the 2024 final rule requires them to maintain and produce.

Send the appeal by a method that creates a record. Certified mail with return receipt is the gold standard. Many insurers also have online portals that timestamp submissions, and that works too. Keep copies of everything.

Level two and the peer to peer review

If the level one appeal is denied, most plans offer a second internal appeal. The timeline to file is usually similar, thirty to sixty days from the level one decision. The level two review is supposed to be conducted by someone who wasn’t involved in the original denial or the first appeal.

This is also the stage where a peer to peer review often comes into play, especially for medical necessity denials. A peer to peer is a phone call between your treating clinician and a clinician employed by the insurer, where they discuss the case directly. Your provider can request one, and in many states they have to be offered one before a denial becomes final. If you’re appealing a denial of inpatient, residential, PHP, or IOP care, ask your provider whether a peer to peer has been requested or completed, and if not, request that one happen before the level two appeal is decided. These calls overturn denials more often than the formal paperwork does, because the insurer’s clinician finally gets the real story instead of a paperwork summary.

You win by reading the denial letter, doing exactly what it says, and not tossing the whole thing in a drawer.

External review, the independent referee

Once you have exhausted the internal appeals, you have the right to an external review. This is a review conducted by an independent third party, not the insurance company, and the decision is binding on the insurer. External review is one of the most powerful tools consumers have and it’s dramatically underused.

You can request an external review after both levels of internal appeal are denied, or sooner if your situation qualifies as urgent. Urgent generally means a delay would seriously jeopardize your life, health, or ability to regain maximum function, or would subject you to severe pain that can’t be managed without the care in question. Acute suicidality, active psychosis, or severe withdrawal would typically qualify as urgent.

The external reviewer is an independent review organization, often shortened to IRO, contracted either by the state regulator or, for federally regulated plans, by the U.S. Department of Health and Human Services. The reviewer assigned to your case has to be a clinician with relevant expertise. They review the file, sometimes request additional information, and issue a decision. If the IRO sides with you, the insurer must comply.

Standard external reviews are decided within forty five days. Expedited reviews for urgent care are decided within seventy-two hours, sometimes faster. There is usually no cost to you, or a nominal fee that gets refunded if you win.

The mental health parity escalation, the angle insurers don’t want you to know

This is the section most insurance appeals guides treat as a footnote. It should be a headline. The federal Mental Health Parity and Addiction Equity Act of 2008, usually called MHPAEA, requires group health plans and individual market plans to cover mental health and substance use disorder benefits at least as generously as they cover medical and surgical benefits. The 2024 final rule, finalized in September of that year and phased in starting in 2025, sharpened the requirements significantly.

What this means in practice. If your plan applies stricter prior authorization to mental health than to comparable medical care, that’s a parity violation. If it has narrower networks of mental health providers compared to physical health providers, that’s a parity issue. If it applies tighter medical necessity criteria, more aggressive utilization review, or different reimbursement rates that result in narrower access, those are potential violations too. The 2024 rule explicitly requires plans to perform and document a comparative analysis of their nonquantitative treatment limitations, and they have to give you a copy on request.

Here is the language to put in an appeal where parity may be at issue. Quote it directly, then attach a request for the analysis.

I am invoking my rights under the Mental Health Parity and Addiction Equity Act of 2008 (MHPAEA) and the September 2024 final rule. I have reason to believe the denial of this claim reflects a nonquantitative treatment limitation (NQTL) applied more stringently to mental health and substance use disorder benefits than to comparable medical and surgical benefits under my plan.

Pursuant to 29 CFR 2590.712 and the corresponding regulations, I am requesting the plan's written comparative analysis of the NQTL at issue, including the specific evidentiary standards, processes, strategies, and factors used to design and apply the limitation, and how those compare to the application of the same NQTL to medical and surgical benefits in the same classification.

I am also requesting that this appeal be reviewed for compliance with MHPAEA, and that any finding of noncompliance result in the claim being approved and processed at parity with comparable medical or surgical care.

That language, dropped into an appeal, changes the conversation. The insurer has to actually engage with parity, and if they can’t produce a defensible comparative analysis, they have a real problem.

Know your plan type: ERISA versus state regulated

ERISA plans, the self-funded employer wrinkle

If your health insurance is through your employer, there’s a good chance the plan is self-funded, sometimes called self-insured, even if it has the logo of a major insurance company on the card. The big insurers often administer self-funded plans on behalf of the employer, but the employer is actually on the hook for the claims. These plans are regulated under the federal Employee Retirement Income Security Act of 1974, usually called ERISA, not under state insurance law.

This matters for two reasons. First, ERISA plans aren’t subject to most state insurance regulations, which means the Oregon Division of Financial Regulation or the Washington Office of the Insurance Commissioner can’t directly help you, although they can sometimes point you in the right direction. Second, ERISA has its own appeal and enforcement structure, overseen by the U.S. Department of Labor’s Employee Benefits Security Administration, which everyone abbreviates as DOL EBSA.

If your ERISA appeal is denied at every internal level, you have a few options. You can request external review, which most ERISA plans are required to offer under the Affordable Care Act. You can file a complaint with DOL EBSA, which investigates parity violations and other ERISA fiduciary breaches. And, if it comes to it, ERISA gives you a private right of action, meaning you can sue the plan in federal court for the denied benefits and, in parity cases, for systemic violations.

To check whether your plan is self-funded, ask your HR department, or look at the Summary Plan Description, often abbreviated SPD, which the plan has to give you on request. The SPD will usually say.

State regulated plans in Oregon and Washington

If your plan is fully insured rather than self-funded, meaning the insurance company is actually bearing the risk and the plan is regulated under state law, you have an additional layer of help.

In Oregon, the agency is the Department of Consumer and Business Services, Division of Financial Regulation, usually called DFR. You can file a consumer complaint with DFR if you believe your insurer is violating state law, denying claims improperly, or failing to meet network adequacy standards. DFR also administers external review for state regulated plans in Oregon. They won’t represent you in a lawsuit and they can’t order an insurer to pay a specific claim outside the external review process, but they can investigate, mediate, and apply regulatory pressure that often results in claims getting paid.

In Washington, the equivalent agency is the Office of the Insurance Commissioner, almost always shortened to OIC. The OIC has a strong consumer advocacy arm and a track record of taking parity enforcement seriously. They handle complaints, mediate disputes, and administer external review for Washington-regulated plans.

Filing a complaint with DFR or OIC is free, it doesn’t require a lawyer, and it puts your insurer on notice that a regulator is now watching. Even when the regulator doesn’t have direct authority to order payment, the act of opening a complaint often shakes loose a settlement or a reversal.

Practical templates: timeline and sample letter

What the timeline actually looks like

If you do this by the book, here’s the rough timeline you should expect from denial to resolution.

1. Day 0. Denial letter arrives. Read it the same day. Calendar your appeal deadline.
2. Day 1 to 14. Request the full claim file from the insurer. Contact your treating clinician about a letter of medical necessity and, if relevant, a peer to peer review. Start gathering evidence.
3. Day 14 to 30. Draft and submit the level one internal appeal with all supporting documents. Send by certified mail or through the insurer’s portal with timestamped confirmation.
4. Day 30 to 60. Insurer responds to level one appeal. Federal rules require a response within thirty days for pre-service claims and sixty days for post-service claims, with shorter windows for urgent care.
5. Day 60 to 90. If level one is denied, file level two internal appeal. Request a peer to peer review if not already done.
6. Day 90 to 120. Insurer responds to level two. If still denied, request external review and, if applicable, file complaints with DFR, OIC, or DOL EBSA.
7. Day 120 to 165. External review decision issued. If decided in your favor, the insurer must comply.

Urgent cases compress this dramatically. An expedited external review on an acute mental health admission can be decided within seventy-two hours of the request.

A sample appeal letter you can adapt

Here is a template. Adapt it to your situation, fill in the specifics, and have your treating clinician review the clinical parts before you send it.

[Your name]
[Your address]
[Member ID]
[Date]

[Insurance company appeals department address]

Re: Level One Internal Appeal
Claim Number: [number]
Date of Service: [date]
Provider: [name and NPI]
Denial Reason Cited: [reason from letter]

To Whom It May Concern,

I am writing to formally appeal the denial of the above claim, denied by letter dated [date]. The denial cites [reason]. I believe this denial is incorrect for the following reasons.

1. The care provided was medically necessary based on my clinical presentation, which included [brief summary: symptoms, severity, functional impact, prior treatment history]. Attached is a letter of medical necessity from my treating clinician, [name, credentials], detailing the clinical rationale for the level of care provided.

2. The care provided meets the published clinical standards for my condition. Attached are the relevant guidelines from [APA, ASAM, or other authoritative source] showing that [level of care] is the appropriate standard for presentations like mine.

3. [If applicable: parity language from the MHPAEA section above.]

4. [If applicable: procedural defects in the denial letter, missing disclosures, vague reason codes, etc.]

I am requesting that this denial be reversed and the claim be paid in full. I am also requesting a copy of all documents, records, and other information relevant to the claim, including the medical necessity criteria used to make the denial decision, as required under 29 CFR 2560.503-1.

Please confirm receipt of this appeal in writing and provide an expected decision date. I can be reached at [phone] and [email].

Sincerely,
[Your name]

Enclosures:
- Letter of medical necessity from treating clinician
- Relevant clinical documentation
- Published clinical guidelines
- Denial letter
- [Any other supporting evidence]

That is the bones. Add or subtract based on your situation. The key is specificity, evidence, and a clear ask.

Lawyering up, and the honest part

When to get a lawyer involved

Most appeals don’t need a lawyer. The internal appeal, the external review, the regulator complaint, all of these are designed to be navigable by ordinary people, and most denials that get reversed get reversed without anyone hiring counsel.

The situations where a lawyer makes sense. The dollar amount at stake is large, meaning thousands or tens of thousands, like a long inpatient or residential stay. The denial pattern looks systemic, meaning your insurer is denying parity-protected services across the board, and there may be a class action angle. You are on an ERISA plan, you have exhausted internal appeals and external review, and you’re considering federal court litigation. The denial involves bad-faith conduct, like the insurer ignoring deadlines, refusing to provide the documents they’re required to provide, or making clinical determinations using guidelines that aren’t the ones disclosed to you.

Look for attorneys who specialize in ERISA and health insurance bad faith. Many work on contingency for the right cases, meaning they only get paid if you win. Both Oregon and Washington have a handful of firms that do this work seriously, and the state bar referral services can point you to them.

Why keep going at all

They deny stuff on purpose because most people fold. Insurers profit when claims get paid less often, and a significant percentage of valid claims get denied on the first pass specifically because most people won’t push back. The numbers aren’t subtle.

Stick with the appeal long enough and it can actually work. The numbers vary by state and by category, but somewhere between thirty and sixty percent of mental health denials that get appealed all the way through external review end up reversed. That isn’t a small number. That is the kind of number that makes the paperwork worth it.

If you’re sitting on a denial right now, pick a day this week to start. Read the letter. Calendar the deadline. Email your provider. The whole thing is built to feel impossible and it’s mostly just tedious. Tedious you can handle.