Therapy invoice template: Required fields and how to fill it out

Key takeaways

A therapy invoice is a formal request for payment from a client or insurer, covering session details, fees, and payment terms.

Every invoice needs your name and credentials, the client’s details, the date of service, the session fee, and payment instructions.

Insurance billing adds three fields: your NPI number, a CPT code for the session, and an ICD-10 diagnosis code.

An invoice requests payment. A superbill is a coded receipt the client files with an out-of-network insurer.

Practice management software like Pabau builds the invoice from the completed appointment, so nobody retypes fees or codes.

Most therapists start out copying an invoice off the internet or writing one by hand. Both cost time, invite errors, and leave no record to fall back on when a client disputes a charge. A structured invoice reads as professional to clients and payers alike. It also makes sure you collect what you are owed.

This guide covers what belongs on a therapy invoice, how it differs from a superbill, and how to fill one out. It also walks through modality-specific billing for physical therapy and massage, plus what changes between insurance and self-pay clients.

What is a therapy invoice?

A therapy invoice is a formal billing document you send to a client, or to their insurer, requesting payment for sessions delivered. It records the dates, the session type and length, the fee per session, and the total due.

A receipt confirms a payment already made, while an invoice asks for one. A superbill goes further, carrying the diagnosis and procedure codes an insurer needs. A plain invoice stays simpler, focused on the amount owed and how to pay it.

• Used by solo therapists and group practices alike
• Sent to self-pay clients for sessions they pay out of pocket
• Sent to an insurer when you bill on the client’s behalf
• Creates a formal record for accounting and tax purposes
• Required by most state licensing boards as part of your billing records

What to include on the invoice

An effective invoice carries mandatory fields plus a few optional ones. The mandatory fields keep it professional and defensible. The optional fields exist for insurance billing and more complicated payment arrangements.

Invoice or superbill: How they differ

Therapists most often go wrong by treating an invoice and a superbill as one document. The two have different purposes and different readers.

In practice, a therapist sends a self-pay client an invoice for $75. An out-of-network client gets a superbill carrying CPT code 90834 and ICD-10 code F41.1, then files it with their insurer for partial reimbursement.

How to fill it out, step by step

Use the download above as your reference. Five steps complete a therapy invoice accurately.

1. Add your practice information. Print your full name, credentials, NPI number if you bill insurance, practice address, phone, and email. Pre-fill this block on your template so you type it once.
2. Insert client details. Record the client’s name, date of birth, address, phone, and email. For insurance billing, add their member ID and group number.
3. Fill in the service line. Enter the date of service, the session length, the session type, and the CPT code where one applies.
4. Enter the fee and total it up. Write the per-session rate and multiply it by the number of sessions billed. Subtract any deposit or insurance payment already received.
5. Add payment instructions. Give the due date, usually 15 to 30 days, the methods you accept, and where to send payment. If you invoice from your practice software, include the payment link.

How invoicing differs by modality

The core structure holds across modalities. The billing conventions underneath it do not, and the difference shows up as soon as you bill a payer.

Physical therapy: Billing by treatment unit

Physical therapy is often billed in 15-minute treatment units rather than a flat session rate. Use the CPT codes for the treatments delivered, such as 97110 for therapeutic procedures. Modifiers such as 59 for a distinct procedural service may apply when several treatments are billed in one session.

Massage therapy: Type, duration, and add-ons

A massage invoice shows the massage type, the duration, and the session fee. For insurance, use the appropriate CPT code, such as 97124 for massage therapy. Some practices add a line for gratuity. Others note add-ons such as aromatherapy or hot stones.

Invoicing insurance vs self-pay clients

Which fields you need depends on who pays. Sound revenue cycle management starts with that distinction, so it is worth settling before the first invoice goes out. The matrix below shows what each of the three routes asks for.

Insurance eligibility verification before each session prevents billing surprises. Confirm the client’s coverage and copay before the invoice goes out.

Common invoicing mistakes, and how to avoid them

Billing errors cluster around rushed invoices and missing fields. Medical billing compliance habits catch them before they delay payment or trigger a denial.

• Missing NPI number. Insurers reject claims without it, so confirm yours on the NPPES NPI Registry before you bill.
• Wrong CPT code. Psychotherapy codes track session length: 90832 for 30 minutes, 90834 for 45, and 90837 for 60. The wrong code slows reimbursement and can invite a post-payment audit.
• Vague session description. Skip “therapy session” and “treatment.” Write “individual psychotherapy, 45 minutes” or “deep tissue massage, 60 minutes” instead.
• No diagnosis code on an insurance invoice. The ICD-10 code ties the clinical necessity of the session to the fee. Without it, a payer can deny the claim as not medically necessary.
• Late submission. Invoice within two or three days of the session, while your notes are fresh. Delayed invoices invite questions and slow the payment down.

Storing invoice data under HIPAA

Therapy invoices carry protected health information, known as PHI: client names, dates of birth, diagnosis codes, and insurance details. HIPAA requires that PHI sit behind limited access, encryption, and regular backups.

Practice software built for HIPAA encrypts PHI at rest and in transit. It restricts records by role, so reception staff cannot open clinical notes. It also logs who opened which record, and when. A Word or PDF invoice saved on your laptop has none of those safeguards.

Invoices held in a system with access controls, encryption, and an audit log meet HIPAA’s technical safeguards. Invoices sitting in an unencrypted folder or an email thread leave you exposed to breach liability.

How Pabau automates therapy invoicing

A static template works while you have a handful of clients. As the practice grows, manual invoicing turns into a bottleneck. Entry errors climb, payments slip, and admin time goes with them.

Pabau builds the invoice from the completed appointment instead. Mark a session complete in the calendar, and the client name, date, duration, therapist, and fee arrive pre-filled. You check it and send.

For insurance work, Pabau keeps your NPI, your CPT codes, and each client’s plan details in the client record. That record feeds claims software for therapists, which pre-populates the invoice with the correct codes. Superbills come off the same data, so nobody transcribes diagnosis codes by hand.

See how Pabau generates invoices automatically.

Reduce billing errors and accelerate payment with automated invoice generation from your therapy appointment calendar.

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Conclusion

The invoice is where a session turns into money, so the fields on it decide how fast you get paid. Get the payer-specific ones right and most claims clear on the first pass.

Download the template and set up one master copy with your practice details and NPI already in place. That will carry a solo caseload comfortably. Once two or three therapists are billing, retyping the same details is the part that starts costing you.

That is the point to move invoicing into the system that already holds the appointment. Book a demo to see how Pabau turns completed therapy sessions into invoices your clients can pay.

Continue your research

Need a coded receipt for an out-of-network client? The complete superbill guide for healthcare providers walks through the codes and documentation an insurer expects.

Billing a client’s plan directly? The assignment of benefits form template lets you collect from the insurer instead of chasing the client.

Billing a 45-minute session? CPT code 90834 sets out what payers expect to see documented for individual psychotherapy.

Frequently asked questions