How to Do OON Billing as a Therapist (Without Contracting With Insurance)

Many therapists assume that accepting insurance means joining a panel. It does not. Out-of-network billing lets you work with clients who have insurance coverage without signing a contract with any payer, and without giving up control over your fees, your schedule, or how you run your practice.

This post walks through how OON billing actually works, what courtesy billing means in practice, and what you need to set it up correctly.

What OON Billing Actually Means for Therapists

Out-of-network billing means you have no contract with the insurance company. You set your own rates, collect payment directly from the client, and either submit a claim on their behalf or provide them with a superbill they can submit themselves.

The client is reimbursed by their insurance according to their plan's out-of-network benefits, typically a percentage of the allowed amount after their deductible is met.

You stay independent. The client uses the coverage they are already paying for. That is the core of how OON billing works.

Courtesy Billing vs. Superbills: What Is the Difference?

There are two main ways to handle OON billing as a therapist.

With a superbill, you provide the client with an itemized receipt that includes your NPI, license information, diagnosis codes, and CPT codes. The client submits it to their insurance directly and receives reimbursement in their own name.

With courtesy billing, your practice submits the claim to insurance on the client's behalf as a courtesy. The client still pays you directly, but you handle the submission. Reimbursement goes to the client.

Courtesy billing creates a more supported experience for clients and reduces the chance that claims are submitted incorrectly. It takes more administrative time on your end, but it is a meaningful service differentiator for practices that want to offer high-touch support.

How to Verify OON Benefits Before the First Session

Before you do any OON billing, you need to verify the client's out-of-network mental health benefits. Do not skip this step. Clients who do not understand their coverage become frustrated clients, and frustrated clients dispute payments.

When you call the number on the back of the client's insurance card, ask specifically for out-of-network mental health benefits. The questions that matter most are:

Does the plan include out-of-network mental health benefits? What is the out-of-network deductible and how much has been met? What is the reimbursement percentage after the deductible? Is there a separate out-of-pocket maximum for OON services? Are there session limits or authorization requirements?

Document what you are told, who you spoke with, and the reference number for the call. This protects you if there is a dispute later.

What a Clean Superbill Needs to Include

Whether you are doing full courtesy billing or providing superbills for clients to submit, the document needs to be formatted correctly or the claim will be rejected.

A compliant superbill includes your full name and credentials, your NPI number, your practice address, the client's name and date of birth, the date of service, the CPT code for the session, the diagnosis code (ICD-10), your full fee, and your signature.

The most common superbill errors that cause rejections are missing or incorrect NPI numbers, wrong CPT codes for the service provided, mismatched diagnosis codes, and incomplete provider information. Getting this right from the start saves everyone time.

What the No Surprises Act Requires for OON Providers

If you are billing out-of-network, the No Surprises Act requires you to provide clients with a Good Faith Estimate before treatment begins. This is a written estimate of the expected cost of services for the year.

For a therapy practice, this typically means documenting your session rate, your anticipated frequency, and an estimated annual total. It does not need to be exact, but it does need to be provided and documented.

This is not optional. It applies to self-pay and OON clients. Building it into your intake process is the cleanest way to stay compliant.

When OON Billing Makes Sense for Your Practice

OON billing works well for therapists who want to avoid insurance contracts while still serving clients with coverage. It tends to be a good fit when your clients have PPO plans with meaningful OON benefits, when you want to maintain fee autonomy, or when you are transitioning out of a platform like Alma or Headway and building a direct billing infrastructure.

It is not the right model for every practice. If most of your clients are on HMO or Medicaid plans, OON benefits may not apply. The decision should be based on your client population and your practice goals, not on what sounds appealing in theory.

Want to Set This Up Correctly?

The OON Benefits Guide for Therapy Practices covers benefit verification scripts, superbill formatting requirements, No Surprises Act compliance, and a framework for deciding whether adding insurance panels makes financial sense for your practice.

Get the OON Benefits Guide ($37) →

If you want to work through your specific setup, a Strategy Session is the right next step.

Book a Strategy Session →