How to Bill for Therapy Sessions: A Step-by-Step Guide

A practical resource for therapists navigating insurance billing, CPT codes and claim submission in 2026.

Therapy billing is the process of charging for mental health services. It may involve billing a client directly, submitting a claim to insurance or giving the client a superbill for out-of-network reimbursement.

Every claim you submit needs to speak the language that insurers understand. That means using CPT codes (which describe what service you provided) and ICD-10 diagnosis codes (which explain why the client needed that service). Get those right and the claim moves forward. Get them wrong and you are chasing a denial for the next three weeks.

In most U.S. practices, therapy billing includes:

For private practices, accurate mental health billing is not just admin work. It protects cash flow and keeps your practice compliant.

Correct billing helps therapists get paid faster and avoid unnecessary claim denials. It also improves the client experience – people do not enjoy surprise bills and transparent financial communication builds trust from the very first appointment.

A streamlined billing system can help practices get paid faster, reduce claim denials, keep track of patient balances more accurately and improve overall financial communication. The CAQH Index reports that administrative inefficiencies still cost the U.S. healthcare industry billions every year. That is why efficient billing workflows and automation are so important – they help cut down unnecessary costs and keep operations running smoothly.

Before a single session happens, you need the right information in hand. This step feels basic, but missing details at intake is the number one cause of billing delays down the road.

Quick tip: Take a photo of both sides of the insurance card at intake. It takes thirty seconds and will save you more headaches than you expect – especially when a plan type turns out to be different than what the client described.

This is the step that separates therapists who get paid consistently from those who don’t. Verifying benefits before the first appointment is not being overly cautious – it is being smart.

Call the member services number on the back of the insurance card or log into the insurer’s provider portal. You want to confirm:

Important: When you call, write down the date, the time and the name of the representative you spoke with. If coverage information changes later and the insurer claims they told you something different, your notes are your protection.

A note on behavioral health carve-outs: Many major insurers – including UnitedHealthcare, Aetna, Cigna and BCBS plans – administer mental health benefits through separate carve-out vendors. Common ones include Optum/UBH (United Behavioral Health), Carelon (formerly Beacon), Magellan and Evernorth. Being in-network with the medical plan does not automatically mean the behavioral vendor covers your claims. Always confirm which entity handles mental health benefits and verify your participation with them specifically.

CPT codes – short for Current Procedural Terminology are five-digit codes assigned by the American Medical Association that describe the exact service you provided. Picking the wrong one is one of the most common (and easily avoidable) billing mistakes.

A few add-on codes frequently come up in behavioral health practice but often get overlooked:

Audit risk for 90837: Many commercial payers audit 90837 claims more aggressively than 90834 because it is a higher-paying code. To bill 90837, your documentation must reflect a session of at least 53 minutes. Therapists who consistently bill 90837 without clear documentation of session duration face real audit exposure. When in doubt about session length, bill the lower code.

Every claim you submit needs at least one ICD-10-CM diagnosis code. Think of this as the “why” behind your service – it tells the insurance company what condition you are treating and why the treatment is medically necessary.

A few of the most common codes therapists use:

One thing that trips up a lot of clinicians: the DSM-5 guides your clinical thinking, but it is the ICD-10 codes that go on the claim. They do not always map perfectly to each other, so double-check your crosswalk before submitting. And whatever code you list, it needs to match what is actually written in your clinical notes – a mismatch is a compliance issue, not just a billing inconvenience.

Insurance companies can request your records at any time. If your notes do not support the service you billed for, that claim will get denied – and in some cases, you will be required to repay the revenue.

Good clinical notes are not just a billing formality. They protect your license, support continuity of care and justify every dollar you are reimbursed. Make sure your notes consistently include:

If you ever face an audit, your documentation is your best defense. Keep it consistent, keep it clinical and keep it current.

Now you are ready to put it all together into an actual claim or invoice.

You will use a CMS-1500 claim form – the industry-standard form for outpatient healthcare billing. Most EHR platforms and billing software generate this automatically once you enter the session details. The key fields that need to be accurate:

In this case, you will create either a simple invoice or a superbill. A superbill is more detailed and includes everything a client would need to submit their own out-of-network claim to their insurance company:

Some clients specifically ask for superbills to seek out-of-network reimbursement themselves. Having a clean template ready saves everyone time.

Nearly all insurers now require electronic claim submission through an EDI (Electronic Data Interchange) system. You can submit through a clearinghouse like Availity or Change Healthcare, directly through the payer’s provider portal, or through your EHR’s built-in billing module.

One thing you cannot afford to overlook: timely filing deadlines. These vary significantly by payer, and getting them wrong means losing the claim with virtually no path to appeal:

For most commercial payers, the realistic window falls somewhere between 90 and 180 days – but always verify your specific contract terms. Missing a timely filing deadline means that claim is gone. Build a reminder system and track your submission dates.

After the payer processes the claim, review the Explanation of Benefits (EOB) or Electronic Remittance Advice (ERA). This document shows what was paid, adjusted, denied or assigned to the client.

Track the allowed amount, insurance payment, client responsibility, contractual adjustment, denial codes and any unpaid balances. Disciplined payment posting helps you spot payer issues before they quietly become revenue leaks.

Once insurance pays, collect whatever the client owes – their deductible, copay or coinsurance. Send a transparent statement that shows exactly what insurance is covered and what remains.

A denied or rejected claim does not mean you do not get paid. It means you need to take action – quickly and correctly.

A Note on MHPAEA: Your Clients’ Rights Under Mental Health Parity.

The Mental Health Parity and Addiction Equity Act (MHPAEA) is a key law in behavioral health billing, but it is often misunderstood or overlooked. It requires insurance companies to treat mental health and substance use treatment the same way they treat medical and surgical care… In other words, insurers cannot impose stricter session limits, tougher prior authorization rules or additional coverage restrictions for behavioral health services.

If a client is suddenly being cut off after a certain number of sessions, denied prior authorization for treatment or facing coverage restrictions that would not apply to physical health care, the MHPAEA may come into play. Understanding how this law works can help you better advocate for your clients and recognize when an insurance denial should be challenged.

Telehealth billing for mental health services has evolved considerably in recent years, and 2026 brings meaningful stability. Under the Consolidated Appropriations Act of 2026, Medicare telehealth flexibilities have been extended through December 31, 2027. The in-person visit requirement for behavioral telehealth – which would have required patients to visit a clinician before receiving remote therapy – has been deferred until January 1, 2028. Additionally, behavioral health telehealth now holds permanent status under Medicare with no geographic restrictions, which is a significant long-term win for both therapists and their clients.

Most major commercial insurers continue to reimburse video-based therapy sessions at the same rate as in-person visits, though you should always verify with each payer.

Audio-only coverage under Medicare: This is a meaningful 2026 update. Medicare now permanently covers audio-only behavioral health sessions when audio-video technology is not available or accessible for the patient. This is no longer a COVID-era flexibility – it is permanent. Bill audio-only sessions with modifier 93, or modifier FQ for FQHC/RHC settings.

Medicaid telehealth rules continue to vary significantly by state. What is allowed in California may not apply in Texas or New York. Always verify your state’s specific requirements and if you are practicing across state lines, look into the PSYPACT compact (for psychologists) and the Counseling Compact (for licensed counselors) to understand your telehealth authorization in each state.

Many experienced therapists land somewhere in the middle – accepting a select few insurance panels while keeping part of their caseload as private pay. It helps you stay financially stable by not depending on a single revenue source.

Both can work – it depends on your practice size, bandwidth and where your time is best spent.

Practice management and billing software like SimplePractice, TherapyNotes, or TheraNest works well if you want full visibility into your claims and have the capacity to manage the process yourself. You stay in control, but that also means you own the problem when something goes wrong.

Outsourcing to a billing service makes sense when you find yourself spending more time chasing claims than seeing clients. A good billing service handles everything – submission, follow-up, appeals, payment posting – typically for around 5% to 10% of collections for behavioral health practices. For many practices, that cost more than pays for itself in recovered revenue and reclaimed time.

Revix MD provides specialized mental health billing expertise for therapists and private practices. Unlike general medical billing platforms, Revix MD is built specifically for behavioral health providers – which means fewer errors, faster turnaround, and a team that understands the nuances of mental health claims.

Most billing problems are not mysterious. They come from the same handful of mistakes, repeated over and over:

Billing for therapy sessions is never going to be anyone’s favorite part of running a practice. But it does not have to be the part that drains you, either. When you build a reliable process and stick to it, billing becomes a background function instead of a constant source of stress.

Verify benefits before the first session. Use the right codes. Write documentation that actually supports what you billed. Submit on time. Follow up on denials before they expire. That covers the essentials.

Whether you manage billing in-house or work with a trusted partner like Revix MD, what matters most is having a system that works consistently – so you can put your attention where it belongs: with your clients.