How to Submit Out-of-Network Mental Health Claims: The Definitive Guide for Therapists and Psychiatrists

If you're a therapist, psychiatrist, LPC, LCSW, or LMFT operating outside of insurance panels — or if your clients have out-of-network (OON) benefits they want to use — you already know the process can feel like navigating a maze blindfolded. Forms get lost. Claims get denied. Clients get frustrated. And you end up spending more time on hold with payer representatives than you do on anything else.

This guide cuts through the confusion. Whether you're helping a client self-submit a superbill or filing CMS-1500 claims directly to payers as a non-participating provider, here's exactly what you need to know — step by step, with real numbers, real codes, and real payer-specific nuances.

What "Out-of-Network" Actually Means for Mental Health Providers

Out-of-network (OON) means you haven't signed a contract with a specific insurance carrier. You're not on their panel. That doesn't mean your clients can't use their insurance to pay for sessions — it means the reimbursement process is different.

Most commercial insurance plans — including those offered through Aetna, Cigna, UnitedHealthcare (UHC), Anthem Blue Cross Blue Shield, and Humana — offer some level of OON mental health benefits, especially since the Mental Health Parity and Addiction Equity Act (MHPAEA) requires that mental health and substance use disorder benefits be comparable to medical/surgical benefits.

Under a typical OON plan:

The client pays your full fee upfront (or at point of service)
They (or you, on their behalf) submit a claim to insurance
The insurer reimburses a percentage — typically 50%–80% of the "Allowable Amount" — after the OON deductible is met
The client keeps the reimbursement check, or it's sent directly to you if an Assignment of Benefits (AOB) form is in place

Step 1: Verify Your Client's Out-of-Network Benefits Before Session One

This is non-negotiable. Skipping benefits verification is the single biggest source of client billing surprises and provider revenue loss.

Call the member services number on the back of the insurance card (or use the carrier's provider portal) and ask specifically:

Does this plan have out-of-network mental health benefits?
What is the OON deductible? (Common range: $500–$5,000 for individuals)
What percentage does the plan reimburse after the deductible? (Typically 50%–80%)
What is the OON out-of-pocket maximum?
Does the plan reimburse based on Usual, Customary & Reasonable (UCR) rates or a percentage of Medicare?
Is a referral or prior authorization required for outpatient mental health?
What is the timely filing deadline? (Usually 90 days to 1 year from date of service)
Does the plan accept direct claims from non-par providers, or does the member have to self-submit?

Pro tip: Get the name of the representative, the call reference number, and the date. If a claim is later denied citing lack of coverage, you'll need that documentation.

Step 2: Collect the Right Information — Every Time

Before you can submit a claim — whether it's a superbill for the client or a direct CMS-1500 — you need clean, complete data. Missing or mismatched information is the #1 reason OON claims get rejected before they're even adjudicated.

From the client, you need:

Full legal name (as it appears on the insurance card)
Date of birth
Member ID number
Group number (if applicable)
Insurance company name and claims mailing address or EDI payer ID
Relationship to the policyholder (if they're a dependent)
Policyholder's name and DOB (if different from client)

From your practice, you need:

Your full legal name or practice name
Your NPI (Type 1 — individual)
Your Tax ID or SSN (for solo providers)
Your license type and number
Your practice address (must match what's on file with NPPES)
Your taxonomy code (most mental health providers use 193200000X for counselors or 101YM0800X for clinical psychologists, etc.)

Step 3: Generate a Superbill or Complete a CMS-1500 Form

This is where many providers get tripped up. Let's break down both options.

Option A: The Superbill (Client Self-Submission)

A superbill is an itemized receipt that contains all the clinical and billing data an insurance company needs to process a claim. You give it to the client, and they submit it themselves — typically by mail, fax, or through the carrier's member portal.

A compliant superbill must include:

Your name, credentials, NPI, and practice address
Your Tax ID or SSN
Client's name, DOB, and insurance member ID
Date(s) of service
Place of Service code (typically 11 for office or 02 for telehealth)
CPT/procedure code(s) — see table below
ICD-10 diagnosis code(s) — at least one, up to four
Your fee charged
Amount paid by the client
Your signature or attestation

Most major carriers — including Aetna, BCBS, and UHC — accept superbills submitted by members through their online portals, by mail, or by fax. Cigna members can upload superbills directly at mycigna.com. UHC members use myuhc.com. Aetna members submit via aetna.com/members.

Option B: Direct Claim Submission via CMS-1500

As a non-participating (non-par) provider, you can also submit claims directly to the insurance company on behalf of your client — but you'll need an Assignment of Benefits (AOB) form signed by the client authorizing the insurer to pay you directly.

The CMS-1500 is the universal paper claim form for professional services. You can submit it:

By mail to the carrier's claims address
Electronically via a clearinghouse (e.g., Office Ally, Availity, Change Healthcare) using the payer's EDI ID

Electronic submission is faster, traceable, and significantly reduces processing time from 30–45 days (paper) to 7–14 days (electronic).

Step 4: Use the Right CPT Codes for Mental Health Services

Using the wrong CPT code — or using a code that doesn't match your documented service — is a fast track to a denial (or worse, an audit). Here are the most commonly used behavioral health CPT codes:

| CPT Code | Service Description | Typical Session Length | Notes | |---|---|---|---| | 90791 | Psychiatric Diagnostic Evaluation (no medical services) | 45–60 min | Use for initial intake only | | 90792 | Psychiatric Diagnostic Eval with Medical Services | 45–60 min | Psychiatrists/NPs only | | 90832 | Psychotherapy, 30 minutes | 16–37 min | Lower reimbursement | | 90834 | Psychotherapy, 45 minutes | 38–52 min | Most common for 45-min sessions | | 90837 | Psychotherapy, 60 minutes | 53+ min | Highest reimbursement for therapy | | 90847 | Family Psychotherapy with Patient Present | 50+ min | Couples/family therapy | | 90853 | Group Psychotherapy | Variable | Per-patient billing | | 99213 + 90833 | E/M (established patient) + Add-on Psychotherapy | Variable | Common for med management + therapy | | 99214 + 90833 | E/M (moderate complexity) + Add-on Psychotherapy | Variable | Psychiatrist med visits |

Important: The CPT code must match your session notes. If you bill 90837 (60-minute therapy) but your note documents a 45-minute session, that's a billing discrepancy — and it puts you at audit risk.

Step 5: Pair Every CPT Code with a Valid ICD-10 Diagnosis

Every claim needs at least one ICD-10-CM diagnosis code that is medically necessary and supported by your clinical documentation.

Common behavioral health ICD-10 codes:

F32.1 — Major depressive disorder, single episode, moderate
F41.1 — Generalized anxiety disorder
F43.10 — Post-traumatic stress disorder, unspecified
F90.0 — ADHD, predominantly inattentive type
F33.0 — Major depressive disorder, recurrent, mild
F41.0 — Panic disorder
F60.3 — Borderline personality disorder
Z03.89 — Encounter for observation (use cautiously — payers may deny for lack of medical necessity)

The diagnosis on your claim must align with what's in your clinical notes. Inconsistencies between your superbill diagnosis and your progress notes are a primary audit trigger.

Step 6: Submit the Claim and Track It

Once the superbill is in the client's hands — or you've submitted the CMS-1500 directly — the work isn't over. You need a tracking system.

Note the date of submission (for timely filing purposes)
Record the claim number (assigned by the carrier or clearinghouse)
Follow up at 30 days if no payment or denial has been received
Document every phone call: date, rep name, reference number, outcome

Most carriers process OON claims within 30–45 days for paper and 7–21 days for electronic submissions. If you're past that window, call member services and ask for the claim status.

Payer-Specific OON Submission Tips

| Payer | Member Portal | Accepts Provider-Direct OON Claims? | Notes | |---|---|---|---| | UnitedHealthcare | myuhc.com | Yes (with AOB) | EDI Payer ID: 87726 | | Aetna | aetna.com/members | Yes (with AOB) | Submit CMS-1500 to regional address | | Cigna | mycigna.com | Yes (with AOB) | Members can upload superbills online | | Anthem BCBS | anthem.com | Yes (varies by state) | EDI Payer ID varies by region | | Humana | humana.com | Yes (with AOB) | Requires paper CMS-1500 for most OON | | Optum | optum.com | Yes | Often processes UHC behavioral health | | Magellan Health | magellanhealth.com | Yes | Behavioral health carve-out payer |

What to Do When an OON Claim Gets Denied

Denials happen. They're not the end of the road. Common OON denial reasons and what to do:

"No out-of-network benefits" → Verify the plan type. Some HMOs genuinely have no OON coverage. If you have benefits verification documentation that says otherwise, file a formal grievance.
"Timely filing exceeded" → This is largely preventable. Always submit within 90 days of the date of service. If denied, appeal with proof of original timely submission.
"Service not medically necessary" → Submit a letter of medical necessity with relevant clinical documentation. This is where solid progress notes matter enormously.
"Invalid diagnosis/procedure code" → Check for coding errors. Refile with corrections.
"Coordination of Benefits (COB) required" → Client may have dual coverage. Determine which is primary and which is secondary.

You have the right to appeal any denial. Most payers allow 180 days to file an internal appeal, and you can escalate to an external review if that fails.

The Role of Clinical Documentation in OON Claim Success

Here's what most billing guides won't tell you: your documentation is your first line of defense.

When an OON claim gets audited or a medical necessity review is triggered, the payer is going to ask for your clinical notes. If those notes are vague, templated, or don't reflect the CPT code billed, you're exposed — to recoupment demands, exclusion from future panels, and in serious cases, fraud allegations.

Every progress note should:

Reflect the actual time spent in session
Document the presenting problems, interventions used, and client response
Include a DSM-5 consistent diagnosis with supporting clinical rationale
Demonstrate ongoing medical necessity for continued treatment
Be completed and signed within 24–48 hours of the session

This is exactly why tools like Mozu Health exist. Mozu's AI-powered documentation platform helps behavioral health providers generate HIPAA-compliant, payer-ready clinical notes that align with the CPT codes billed — reducing audit risk, speeding up claim adjudication, and giving you defensible documentation if a payer ever comes knocking.

Frequently Asked Questions

1. Can I submit OON claims directly to insurance, or does the client have to do it?

You can submit directly as a non-participating provider if the client signs an Assignment of Benefits (AOB) form. Without an AOB, reimbursement goes to the client. Many practices submit on behalf of clients as a courtesy to improve retention and cash flow.

2. How long does it take to get reimbursed for an OON mental health claim?

Electronic claims typically process in 7–21 days. Paper claims take 30–45 days. Reimbursement timelines also depend on whether the client's OON deductible has been met for the year.

3. What if my client's insurance doesn't have OON mental health benefits?

Some plan types — particularly HMOs and some EPOs — don't include OON coverage. In those cases, you can still provide services, but the client will pay fully out of pocket. Consider offering a sliding scale or discussing a payment plan. You can also help the client explore whether their plan qualifies for an exception under MHPAEA.

4. Is a superbill the same as a CMS-1500?

No. A superbill is an itemized receipt you give to the client for self-submission. A CMS-1500 is the standardized claim form submitted by a provider (or biller) directly to the insurance company. Both contain similar data, but the CMS-1500 has specific formatting requirements and is used for direct billing.

5. What's the timely filing deadline for OON claims?

It varies by payer, but most commercial insurers require claims within 90 days to 12 months from the date of service. UnitedHealthcare, for example, typically requires submission within 12 months. Aetna and Cigna often use 180 days. Always verify the deadline during benefits verification — missing it is one of the few denials that can't be appealed.

6. Can telehealth sessions be submitted as OON claims?

Yes. Since the COVID-19 pandemic, most major commercial payers permanently expanded telehealth coverage for mental health services. Use Place of Service code 02 (telehealth provided in other than patient's home) or 10 (telehealth provided in patient's home) on your claim, and append modifier 95 if required by the payer.

7. What happens if I get audited on an OON claim?

The payer will request your clinical documentation for the dates billed. They'll compare your notes against the codes you submitted. If documentation doesn't support the service billed, you may face a recoupment demand requiring you to return overpayments. This is why accurate, detailed, code-consistent notes aren't optional — they're essential.

Final Thoughts: Get Paid Faster, Stay Compliant

Submitting OON mental health claims doesn't have to be a revenue-leaking headache. The providers who navigate it successfully share three things in common: they verify benefits religiously, they document with precision, and they have a reliable system to track submissions and follow up on denials.

The administrative burden is real — but it's also manageable when you have the right tools in your corner.

Ready to Make Your Documentation Work for Your Billing?

Mozu Health is the AI-powered clinical documentation platform built specifically for behavioral health providers — therapists, psychiatrists, LPCs, LCSWs, LMFTs, and group practices. Mozu generates HIPAA-compliant, payer-ready progress notes that align with your CPT codes, reduce audit risk, and support faster claim adjudication — whether you're in-network, out-of-network, or both.

Stop letting sloppy documentation cost you reimbursements.

👉 Try Mozu Health free at mozuhealth.com — and spend more time with clients, less time defending your notes.

How to Submit Out-of-Network Mental Health Claims (2026)