What Is a Superbill? A Therapist’s Guide to Out-of-Network Billing

UPDATED ON: Feb 27,2026

A client finishes their session and asks: “Can you send me a superbill?” You know it has something to do with insurance, but you’re not sure exactly what needs to go on it. Or maybe you’ve been creating them for a while but your clients keep coming back with rejected claims.

Either way, getting superbills right matters. Errors don’t just delay reimbursement; they erode client trust. Here’s a plain-language breakdown of what a superbill is, what it requires, and where things typically go sideways.

What Is a Superbill?

A superbill is a detailed itemized receipt that you give to clients who pay out of pocket. It’s not a regular payment receipt. It contains specific clinical codes and provider credentials that insurance companies require before they’ll consider reimbursing your client.

Here’s the basic flow: your client pays you in full at the time of service. You generate a superbill with all the required information. Your client submits it to their insurer and, if their plan has out-of-network benefits, receives a partial reimbursement directly.

You never file the claim yourself in this scenario. The client does. That’s what makes a superbill different from standard in-network billing, and it’s why so many practitioners confuse it with other insurance forms.

Not every client needs one. Superbills are most relevant for clients with PPO plans that include out-of-network benefits, or clients who pay entirely out of pocket and want to seek reimbursement on their own.

Superbill vs. CMS-1500: What’s the Difference?

If you take insurance at all, you’ve probably encountered the CMS-1500. Understanding the distinction between these two documents saves a lot of confusion.

The CMS-1500 is filed directly by you (or your biller) to the insurance company. The insurer pays you, not the client. This is how in-network billing works: your client pays a copay, and insurance handles the rest of the payment back to your practice.

The superbill goes to your client, not to insurance. Your client pays you the full session fee, then submits the superbill to their insurer themselves. The reimbursement check comes back to them, not to you.

Both documents contain similar information: CPT codes, ICD-10 diagnosis codes, provider NPI, and session details. But the submission path and the payment direction are completely different. An LMFT in Nashville who just went out of network still using CMS-1500 logic for superbill situations will create unnecessary billing headaches for themselves and their clients.

What Goes on a Superbill for Therapy?

This is where the details matter. A single missing field can cause a client’s claim to be rejected outright. A solid superbill template for mental health includes all of the following.

Provider information:

Full name and credentials (LCSW, LMFT, PhD, etc.)
National Provider Identifier (NPI) number
Tax ID (EIN)
Practice name, address, and phone number

Client information:

Full legal name (must match exactly what’s on their insurance card)
Date of birth

Session details:

Date of service
Place of service code (11 for office, 02 or 10 for telehealth)
CPT code for the service rendered. Common therapy codes include:
90837: Individual therapy, 53+ minutes
90834: Individual therapy, 38-52 minutes
90853: Group therapy
Add modifier -95 for telehealth sessions¹
ICD-10 diagnosis code (e.g., F33.1 for major depressive disorder, moderate)
Fee charged and amount paid by the client

Some insurers also require a provider signature. A counselor in Nashville seeing 30 clients per week, 12 of whom request monthly superbills, can’t afford to manually check all of these fields every time. That’s where errors creep in.

How Clients Use a Superbill to Get Reimbursed

Your client receives the superbill and submits it to their insurer, typically through their member portal online. Some plans accept superbills by mail or email. Processing usually takes two to four weeks.²

Reimbursement isn’t guaranteed. What your client actually gets back depends on their specific plan, their out-of-network deductible, and the accuracy of the superbill itself. Most out-of-network plans reimburse somewhere between 50% and 80% of the insurer’s “allowed amount” after the deductible is met.³

One detail that therapists sometimes overlook: insurers have timely filing limits. Most commercial plans require claims to be submitted within 90 to 180 days of the date of service.⁴ If you deliver a superbill two months late, your client may not have enough time to submit before the window closes. They’ll come back to you frustrated, even though the delay started on your end.

A client in Portland with a PPO plan who pays $200 per session and gets reimbursed $120 per session is effectively paying $80 out of pocket. That math only works if the superbill is accurate and delivered on time.

Where Superbills Go Wrong

Most superbill rejections trace back to a small set of preventable errors.

Missing or incorrect NPI. The NPI is how insurers verify the provider. A typo, an old NPI, or a missing NPI stops the claim cold.

Wrong or missing diagnosis code. Every superbill needs an ICD-10 code tied to the session. Submitting without one, or with a code that doesn’t match the client’s clinical presentation, will trigger a rejection.

No telehealth modifier. Since 2020, most therapists have a significant volume of telehealth sessions. If you deliver a session via video and don’t include the -95 or -GT modifier on the CPT code, insurers may reject the claim or reimburse at a lower rate.¹

Client name mismatch. “Mike” and “Michael” are not the same thing to an insurance database. The client name on the superbill must match the name on the insurance policy exactly.

Late delivery. An LCSW in Bangor with 15 out-of-network clients who manually builds superbills in a Word document isn’t just inefficient. She’s creating real risk of errors and delays for clients who are counting on that reimbursement.

HIPAA handling. Superbills contain protected health information (PHI) and must be transmitted securely. Sending them via standard email or text violates HIPAA. Use encrypted email or a secure client portal.

How PIMSY Generates Superbills Automatically

Manual superbill creation is one of those tasks that feels manageable until it isn’t. At five out-of-network clients, a Word template is fine. At fifteen, you’re spending 30-45 minutes per billing cycle re-entering codes, cross-referencing session notes, and hoping you didn’t miss anything.

PIMSY generates superbills directly from session records. The CPT code, ICD-10 diagnosis code, provider NPI, and tax ID are all pulled automatically from the session and your provider profile. You don’t re-enter anything. PIMSY pulls it from what you already documented.

That means the most common error sources: wrong code, missing NPI, forgotten telehealth modifier, are addressed before the superbill is ever generated. Your clients get accurate superbills. Their claims go through. They don’t call you asking why insurance rejected the submission.

Delivery happens through PIMSY’s HIPAA-compliant platform, not through your personal email. The mental health billing software handles the compliance side automatically.

PIMSY’s superbill generation works for solo practitioners on the Prime plan and scales up to multi-clinician group practices. Whether you have three out-of-network clients or three hundred, the workflow is the same: you see the client, document the session, and PIMSY takes care of the superbill.

The Bottom Line

Superbills are straightforward in concept and detailed in execution. Your clients need them to get reimbursed. Errors cost your clients money and cost you their trust.

Getting the codes right, delivering on time, and handling PHI securely are the three things that matter most. PIMSY handles all of them automatically, so you’re not checking a ten-field checklist every time a client asks for a superbill.

Want to see how PIMSY handles behavioral health billing? Request a demo and we’ll walk you through the billing workflow.