Let's be honest: you became a therapist to help people, not to become a billing expert. But here's the reality: if you're not coding your sessions correctly, you're either leaving money on the table or setting yourself up for claim denials that'll make you want to scream into a pillow.
The good news? CPT codes for psychotherapy aren't rocket science once you understand the basics. Whether you're a solo practitioner just starting out or you've been in private practice for years, getting comfortable with codes like 90834 and 90837 can make the difference between a thriving practice and one that's constantly chasing payments.
Let's break down the most common mental health CPT codes in plain English: no medical billing jargon, no confusing tables. Just straightforward guidance to help you bill confidently and accurately.
The Big Three: Your Go-To Psychotherapy Codes
Think of psychotherapy CPT codes like Goldilocks and the Three Bears. You've got your short session, your standard session, and your long session. Here's the breakdown:
CPT Code 90832 covers your briefest individual therapy sessions: anything between 16 and 37 minutes of face-to-face time. These are less common in traditional therapy settings but can be useful for medication management check-ins combined with brief therapy or follow-up sessions.
CPT Code 90834 is your bread-and-butter code. This covers 38 to 52 minutes of individual psychotherapy, which typically translates to your standard "50-minute hour" that most therapists schedule. If you're seeing clients for the typical weekly session, this is probably the code you'll use 80% of the time.
CPT Code 90837 is for your longer sessions: 53 minutes or more. This is for those intensive sessions where you're really digging deep, doing EMDR, or working with a client in crisis who needs extra time. It reimburses at a higher rate because you're providing more extensive service.
Time Is Everything (Seriously, Track It)
Here's where therapists get tripped up: the time ranges matter. A lot.
If you conduct a 51-minute session and bill it as 90834, you're good. If that session runs 54 minutes and you still code it as 90834? You just short-changed yourself. That extra three minutes bumps you into 90837 territory, which typically reimburses $30-50 more depending on your payer.
On the flip side, if you only spend 35 minutes with a client but bill 90834, that's technically incorrect coding: and if you're audited, it could cause problems.
Pro tip: Set a timer or use practice management software that tracks session duration automatically. Document your actual start and stop times in your notes. Insurance companies can and do audit session times, and "approximately 45 minutes" isn't going to cut it.
Beyond the Individual Session: Other Codes You Should Know
Not every therapeutic intervention happens one-on-one. Here are the codes for different service types:
Family Therapy Without Patient (90846): Sometimes you need to meet with a patient's family members without the patient present: maybe you're coordinating care for a teen, or working with a spouse to better support their partner. This code covers sessions of 26 minutes or longer.
Family Therapy With Patient (90847): This is your standard family therapy session where the identified patient is in the room along with family members. Again, 26 minutes or longer.
Group Therapy (90853): Leading a group session for unrelated individuals? This is your code. Note that this is billed per patient, not per group, so if you have 8 people in your group, you submit 8 claims with code 90853.
Crisis Psychotherapy (90839): When a patient is in acute psychological distress: actively suicidal, experiencing a psychotic break, or in severe crisis requiring immediate stabilization: this code covers 30 to 74 minutes of crisis intervention. There's also 90840 for each additional 30 minutes beyond that.
When Sessions Run Long: Add-On Codes
Let's say you're in the middle of an intense EMDR session or processing trauma, and your client needs more than an hour. What then?
You can use add-on codes with 90837 to bill for extended time:
- 90837 + 99354: For sessions lasting 90-134 minutes
- 90837 + 99354 + 99355: For sessions lasting 135-164 minutes
These prolonged service codes used to be physician-only, but mental health providers can now use them. Just make sure your documentation clearly justifies why the extended session was medically necessary.
Documentation: Your Best Defense Against Denials
Here's the thing nobody tells you in grad school: your documentation needs to support your coding, every single time.
For every claim you submit, you need:
- Exact session duration (start and stop times)
- Appropriate ICD-10 diagnosis code that justifies the service
- Clinical notes documenting what you did during the session: assessment, interventions, progress toward treatment goals
If you're billing 90837 for a 60-minute session, your notes should reflect why that client needed the extended time. Is their condition complex? Are you addressing multiple diagnoses? Did a crisis emerge during the session?
The diagnosis code is particularly important. A brief anxiety check-in might not justify a 90837, but a client with complex PTSD, co-occurring substance use disorder, and active suicidal ideation? That's a different story.
Common Coding Traps (And How to Avoid Them)
Trap #1: Rounding Up
A 36-minute session is not a 90834. Don't round up to hit the next time threshold. You'll code 90832 instead and save yourself potential audit headaches.
Trap #2: Billing for No-Shows
You can't bill insurance for sessions that didn't happen. Period. Even if your practice has a cancellation policy where clients pay out-of-pocket for no-shows, those aren't billable to insurance.
Trap #3: Using Outdated Codes
CPT codes change. What was current in 2020 might not be valid in 2026. Make sure you're using current coding guidelines or working with a billing service that stays on top of updates.
Trap #4: Mixing Services Without Proper Modifiers
If you're providing medication management and psychotherapy in the same session, you need to use specific add-on codes and modifiers. This gets complicated fast: it's one area where professional billing support really pays off.
Trap #5: Inconsistent Documentation
If your session notes say "brief check-in" but you billed 90837, that's a red flag. Keep your documentation and coding consistent.
When Billing Gets Overwhelming: The ALS Billing Advantage
Look, you didn't open a therapy practice to spend your evenings fighting with insurance companies about whether 90834 or 90837 was the right code. You opened it to help people heal.
That's where a specialized billing service comes in: and not just any billing service. Mental health billing has its own unique quirks, from frequent authorization requirements to payers who seem to deny claims just for fun.
At ALS Billing, we're 100% USA-based and specialize in mental health billing. We know the difference between 90834 and 90837 in our sleep. We understand the documentation requirements for crisis codes. We know which payers consistently underpay group therapy and how to appeal it.
More importantly, we handle the hassle so you can focus on your clients. No more spending your lunch break on hold with insurance companies. No more wondering if you coded something correctly. Just clean claims, faster payments, and more time doing what you actually love.
The Bottom Line
CPT codes might seem like a necessary evil, but getting them right is crucial for your practice's financial health. The difference between 90834 and 90837 isn't just semantic: it's $40+ per session. Multiply that by hundreds of sessions per year, and you're looking at significant revenue.
Track your time accurately, document thoroughly, stay current with coding guidelines, and don't be afraid to get help when billing gets complicated. Your future self (and your bank account) will thank you.
Want to stop stressing about whether you're coding correctly? Reach out to our team and let's talk about how we can take medical billing off your plate entirely. Because you've got more important things to worry about: like actually helping your clients.