How to Appeal a Denied Mental Health Insurance Claim

To appeal a denied mental health claim, file a written internal appeal with your plan before the deadline on the denial letter, usually 180 days for job-based and Marketplace plans, and include a letter from your clinician explaining why the care is medically necessary. If the plan upholds the denial, you can usually ask for an external review by an independent reviewer within 4 months, and the plan must accept that reviewer's decision. For urgent care you can request a fast-track decision, and you can file the internal appeal and external review at the same time.

Which rules and which external reviewer apply depends on whether your plan is a New York insured plan or a self-funded employer plan. This article explains both, gives a letter outline, and shows how to match your evidence to the reason for denial. It is general information, not tax or legal advice.

Step 1: read the denial and identify the type

Under federal claims rules, a denial notice must state the specific reason, the plan provisions it relies on, and the plan's review procedures and time limits. For group health plans, the notice must also give any internal rule, guideline or criterion the plan relied on, or say that one was relied on and that you can get a copy free on request; for a medical necessity denial, it must explain the clinical judgment or say that explanation is available free on request. For mental health claims, the reason for a denial must be made available to you.

Denials fall into a few types, and each calls for different evidence.

Paperwork denials are the most fixable. Before appealing a denial of an out-of-network claim, check the claim against the superbill and out-of-network claim checklist; a corrected resubmission may solve it faster than an appeal.

Step 2: know your deadlines

One New York rule is worth knowing: if a utilization review agent misses its deadline to decide an appeal, the adverse determination is deemed reversed. Write down the date your appeal was received so you can tell whether the clock has run.

Step 3: gather the file

• Request your claim file. After a denial you are entitled, on request and free of charge, to reasonable access to and copies of all documents and records relevant to your claim.
• Request the plan's medical necessity criteria for the service. For mental health benefits, the criteria must be made available on request to participants, beneficiaries and contracting providers.
• Collect your records: diagnosis, symptom measures your clinician tracked, prior treatments tried and how they went, hospitalizations, and any safety concerns documented.
• Get a letter from your treating clinician (see below).
• Keep copies of everything, including the denial notice, your appeal and notes from phone calls.

You do not have to do this alone. Federal rules allow an authorized representative to act for you in a claim or appeal, and in urgent cases a health care professional who knows your condition may act as your representative. New York uses a standard designee form for health insurance matters.

Step 4: the medical necessity letter

For most mental health denials, the clinician's letter decides the outcome. A strong letter is specific and answers the plan's own criteria rather than arguing in general terms. It usually covers:

1. The diagnosis and current severity, with dates and any standardized measures used.
2. Treatment history: what has been tried, for how long, and the result.
3. Why the requested service, frequency or level of care is needed now, and what is expected to happen without it.
4. Risks the clinician is monitoring, stated factually.
5. How the request meets each element of the plan's medical necessity criteria, quoted from the criteria.
6. For an out-of-network denial, why in-network options are not suitable or not available in time.

Appeal reviewers must consult a health care professional with appropriate training and experience in the relevant field when the denial rests on medical judgment. You may ask the plan who reviewed your case and in what specialty; New York requires appeals of utilization review decisions to be handled by a clinical peer reviewer other than the one who made the first decision.

Step 5: write and send the appeal

Use the plan's appeal form if it has one; otherwise a letter works. A clear outline:

1. Heading: "Request for internal appeal", your name, member ID, claim or reference number, dates of service and the clinician's name.
2. One sentence stating what you are appealing and what you want: for example, that the plan reverse its denial and process the claim under your out-of-network mental health benefits.
3. The plan's stated reason, quoted from the denial.
4. Your response, point by point, referring to the enclosed clinician letter and the plan's own criteria.
5. If relevant, a parity point: that the limit appears more restrictive than the plan applies to comparable medical care, with a request for the comparative analysis.
6. A request for copies of all documents relevant to the claim and the name and specialty of the reviewer.
7. A list of enclosures, your signature and contact details.

Send it in a way you can prove: the plan's portal with a saved confirmation, fax with a confirmation sheet, or tracked mail. Note the date received and the decision due date.

Step 6: external review

If the plan upholds its denial, external review sends the case to an independent reviewer whose decision the plan must accept. The route depends on your plan.

• New York insured plans, Marketplace plans and state-regulated HMOs: file with the Department of Financial Services. DFS covers denials as not medically necessary, experimental or investigational, or out of network, and has a separate form for out-of-network referral denials. A plan may charge a small fee per appeal, waived for Medicaid and Child Health Plus enrollees and in cases of hardship. The DFS external appeal page has the application.
• Self-funded employer plans: New York protections do not apply to self-funded coverage. A self-insured plan that is not subject to a state external review process follows the federal process, in which an independent review organization decides the case, and the plan's notices must describe the available external review process and how to start it. The federal overview is on HealthCare.gov.

Urgent situations do not have to wait for the internal appeal to finish: you can file the internal appeal and an external review request at the same time. If you or someone you care for is in danger now, call 911 or go to the nearest emergency room; insurance can be sorted out afterward.

Out-of-network claims: when the dispute is the amount, not the denial

Many people who see an out-of-network psychiatrist are not denied outright. The claim is paid, but for much less than they expected. That is usually a dispute about the allowed amount, the figure the plan uses as the basis for paying an out-of-network claim, rather than about medical necessity.

• First, compare the explanation of benefits with your plan's out-of-network terms: the deductible, the coinsurance percentage and the stated method for setting allowed amounts. If the plan applied its terms correctly, an appeal has little to work with.
• If the plan used the wrong code, the wrong provider type or the wrong benefit (for example, processing a psychiatrist's visit under a lower-paying category), ask for reprocessing and, if refused, appeal with the corrected information.
• If the method itself looks less generous for mental health care than for comparable medical specialists, ask for the method and the plan's parity comparative analysis. Federal regulations treat methods for setting out-of-network rates as a nonquantitative treatment limit subject to parity.

How allowed amounts are set, and why they so often differ from the charge, is explained in allowed amount, UCR and balance billing.

After the decision

If the plan or external reviewer reverses the denial, ask in writing when the claim will be reprocessed and check the new explanation of benefits when it arrives. Reversals sometimes cover the specific dates appealed but not later visits, so ask whether an authorization now covers ongoing care and for how long.

If the denial is upheld at external review, the decision is binding on the plan, but ask the plan or a free helper whether a new request is possible if your clinical situation changes, for example after a different treatment is tried or symptoms worsen. A fresh request with new evidence is a new claim, not a repeat of the old appeal.

Common mistakes that sink appeals

• Missing the deadline while waiting for records. File on time with what you have, and say more documents will follow.
• Sending a general letter. A letter that does not address the plan's criteria gives the reviewer nothing to reverse.
• Treating a coding denial as a medical necessity dispute, or the reverse.
• Assuming New York external appeal applies to a self-funded plan.
• Not asking for the file. The plan's reviewer notes often show exactly which criterion it thought was missing.

Free help in New York

The Community Health Access to Addiction & Mental Healthcare Project (CHAMP) helps New Yorkers with behavioral health insurance complaints and denial appeals (1-888-614-5400). The Attorney General's Health Care Bureau helpline (1-800-428-9071) and the DFS Consumer Hotline (1-800-342-3736) also take questions, and the U.S. Department of Labor's benefits advisors (1-866-444-3272) help with employer plans. If the denial looks like mental health care is being limited more strictly than medical care, read your mental health parity rights before you write. If the dispute is that you could not find a timely in-network clinician, see New York's out-of-network referral at in-network cost; for medication denials, prior authorization for psychiatric medications covers the separate drug process.

How Dr. Lewis's practice fits in

Dr. Lewis and all of the practice's clinicians are out of network with all insurance plans, including Medicare and Medicaid, and payment is due at the time of service, so appeals for this practice's care usually concern out-of-network reimbursement to you. The practice provides superbills in its patient portal after each session, and for BCBS, Aetna or Cigna plans it can facilitate submitting the out-of-network claim. Payment and insurance details are on the insurance and payment page, and common questions are answered in the practice FAQ. More cost guides are in the Choosing Psychiatric Care guide.

Frequently asked questions

Can my psychiatrist file the appeal for me?

Federal rules let an authorized representative act for you, and in urgent cases a health care professional who knows your condition can act as your representative. In New York, providers also have their own external appeal rights for some denials. Ask your clinician's office whether it handles appeals or provides a supporting letter.

What if I miss the internal appeal deadline?

Contact the plan in writing right away and ask whether it will accept a late appeal for good cause, and ask a free helper such as CHAMP. Missing the deadline can end your right to external review, so it is worth asking before you give up.

Do I need a lawyer?

Most people file internal appeals and external reviews without one. If a large amount is at stake, or the plan is a self-funded employer plan and the denial is upheld after review, a lawyer who handles ERISA benefit claims can advise on further options.

The plan approved some sessions but not as many as my therapist recommended. Can I appeal that?

Yes. A partial approval or reduction is an adverse determination you can appeal. The clinician's letter should explain why the requested frequency is needed under the plan's criteria.

Is an appeal different from a complaint to the state?

Yes. An appeal asks the plan, and then an independent reviewer, to reverse a specific decision. A complaint asks a regulator to look at the plan's conduct. You can do both.

How long should I keep appeal paperwork?

Keep the denial, your appeal, the plan's decisions, explanations of benefits and call notes until the claim is fully resolved and paid. If you deduct medical expenses on your taxes, keep payment records as the IRS advises for your return.

Sources

1. Internal appeals. HealthCare.gov (U.S. Centers for Medicare & Medicaid Services), 2026. healthcare.gov
2. External review. HealthCare.gov (U.S. Centers for Medicare & Medicaid Services), 2026. healthcare.gov
3. 29 CFR 2560.503-1: Claims procedure. Electronic Code of Federal Regulations, 2026. ecfr.gov
4. 29 CFR 2590.715-2719: Internal claims and appeals and external review processes. Electronic Code of Federal Regulations, 2026. ecfr.gov
5. New York Insurance Law Section 4904: Appeal of adverse determinations by utilization review agents. New York State Senate (Consolidated Laws), 2026. nysenate.gov
6. File an External Appeal. New York State Department of Financial Services, 2026. dfs.ny.gov
7. 29 CFR 2590.712: Parity in mental health and substance use disorder benefits. Electronic Code of Federal Regulations, 2026. ecfr.gov
8. Health Insurance for Transgender New Yorkers. New York State Department of Financial Services, 2025. dfs.ny.gov
9. Consumer Complaints. New York State Department of Financial Services, 2026. dfs.ny.gov
10. Governor Hochul Launches Public Awareness Campaign to Educate New Yorkers on Access to Behavioral Health Treatment. New York State Department of Financial Services, 2026. dfs.ny.gov
11. Behavioral health parity laws. New York State Office of the Attorney General, 2025. ag.ny.gov

Educational information, not medical, tax or legal advice. Decisions about diagnosis, medication and treatment belong with a clinician who knows your history.