— Journal

Why Insurance Keeps Denying Your CPT Code 90837 (And How to Fix It)

July 13, 2026

You spent years mastering the clinical side of healing. Empathy, presence, complex modalities- that is your domain. Nobody trained you to act as a detective chasing down insurance denials or deciphering cryptic codes from an Explanation of Benefits (EOB). Yet, if you are running an independent private practice, you have likely noticed a frustrating trend: your 60-minute individual sessions are getting rejected.

The primary culprit behind this administrative headache is CPT code 90837 denied. Payers are increasingly targeting this high-reimbursement code, leaving independent therapists with unbilled hours and depleted energy. Below is an honest, comprehensive look at why your 90837 claims are hitting a wall, how to fix them, and how to stop the cycle entirely.

What 90837 Means And Why It's Scrutinized More Than 90834

To resolve a billing issue, we have to review the specific parameters set by the American Medical Association (AMA). In mental health billing, the main difference between our two primary codes is face-to-face duration, but insurance companies look at them through an entirely different lens.

- 90834: Defined as individual psychotherapy lasting 38 to 52 minutes.

- 90837: Defined as individual psychotherapy lasting 53 minutes or longer (typically blocked as a 60-minute session).

90837 Vs 90834: The Financial And Audit Reality

Reimbursement varies by payer and contract, but 90837 generally reimburses more than 90834, making it subject to greater scrutiny.

Some insurers monitor unusually high utilization of 90837 compared with peer providers. While there is no universal percentage that automatically triggers an audit, consistently billing a high proportion of 90837 claims may increase the likelihood of documentation reviews depending on the payer. The system assumes a standard outpatient caseload should naturally reflect a balanced mix of both codes.

The 6 Most Common 90837 Denial Reasons

When a 90837 claim bounces back unpaid, it is rarely due to a single cataclysmic error. Usually, it is a quiet, systemic paperwork oversight. Here are the top therapy insurance denial reasons hitting independent providers today:

1. Missing Explicit Start And End Times

You cannot simply write "60-minute session" in your clinical note. If an insurance auditor pulls your records and does not see exact timestamps (e.g., Start: 10:05 AM, End: 11:02 AM), you risk getting your CPT code 90837 denied or auto-downgraded to 90834.

2. Vague Or Weak "medical Necessity" Documentation

An extended 53+ minute session requires clinical justification. Boilerplate phrases like "Patient required extended support" or "Continued processing" will trigger a denial. The documentation must clearly show why the patient's acuity, active crisis, complex trauma, or diagnostic severity required that extra time.

3. Missing Prior Authorization

Some commercial plans and certain behavioral health carve-outs may require a prior authorization therapy form or have utilization management requirements for 90837. Always verify benefits before treatment.

4. Incorrect Telehealth Billing Codes & Modifiers

With the rise of virtual care, mismatching your spatial data is a massive trigger for rejections. For virtual sessions, you must use the correct place of service code (usually 02 for a telehealth position outside the patient's home, or 10 if they are in their home) paired alongside the critical modifier 95 to signal a synchronous audio-video interaction.

5. Including Administrative Time In The Duration

Only psychotherapy time counts toward CPT time requirements. Administrative activities, scheduling, or payment discussions should not be included in billable psychotherapy time. Billing 90837 for a session where therapy only lasted 45 minutes technically constitutes upcoding.

6. Violating The Timely Filing Limit

Every payer has a strict window, ranging anywhere from 90 days to one year from the date of service, within which a claim must be received. If a claim sits in your draft folder or is sent to the wrong clearinghouse and passes this timely filing limit, it will be denied with zero chance of standard appeal.

How To Read Your Denial Code Before Resubmitting

Before you attempt to resubmit a rejected claim, you must look at your Electronic Remittance Advice (ERA reconciliation) data or paper EOB. Insurance companies use standardized mental health claim denial codes to tell you exactly what went wrong.

Look for these specific alphanumeric sequences on your dashboard or remittance slips:

- CO-50 (Not Medically Necessary): This means your documentation didn't justify a 60-minute session, or the client’s diagnosis code does not pair with extended treatment in the payer's policy manual.

- CO-197 (Pre-certification/Authorization Missing): You billed a 90837 to a plan that explicitly requires an active authorization number on the CMS-1500 form.

- CO-96 paired with M115 (Missing/Incorrect Modifier): Your telehealth claim is missing modifier 95, or the chosen telehealth billing codes do not match your place of service data.

- CO-29 (Timely Filing Limit Expired): The claim was submitted too late. To fight this, you will need tracking metadata proving it was originally sent before the deadline.

The Resubmission Window

Fixing a denial is a race against the clock. Once a claim is rejected, a secondary clock begins ticking, known as the claims appeal or corrected claim window.

Critical Note: Do not just mail or resubmit an identical claim. If the payer receives a duplicate claim for a session they already denied, their system will automatically throw it out as a duplicate.

You must mark the electronic claim form as a "Corrected Claim" (Frequency Code 7) and include the Original Reference Number provided on the denial EOB. Most major payers grant a 60-180-day window from the initial denial date to submit this correction. If you miss this window, the loss becomes permanent.

When To Bill The Client Instead Of Fighting The Denial

Independent clinicians often feel caught in an ethical dilemma when insurance refuses to pay. Can you pass the balance to the client?

The answer depends entirely on your contract:

- If You Are In-Network (Participating Provider): In-network providers are generally prohibited from billing patients for claims denied because of provider administrative errors, although contract terms vary by payer. The insurance company considers this an administrative provider error, and you must absorb the loss. You can only bill the client for the full rate if they signed an explicit, advance private-pay waiver stating they would pay out-of-pocket if their plan denied the specific code.

- If You Are Out-of-Network: You have far more flexibility. You can supply the client with an accurate superbill reflecting the exact session details, collect your private fee directly, and let them coordinate reimbursement directly with their insurance carrier.

How Outsourced Billing Prevents The Pattern

The reality for independent therapists is that late-night billing, unbilled hours, and tracking down insurance companies quietly bleeds thousands of dollars in revenue every single year. The gap between a therapy practice that is thriving and one that is deeply overwhelmed is almost always an operations gap.

Outsourcing your back office changes the entire pattern. Instead of spending your weekends deciphering EOBs and resubmitting corrected claims, a dedicated partner handles the entire lifecycle:

- Running eligibility and benefit checks before the first session to see if 90837 requires a prior authorization.

- Ensuring correct telehealth place-of-service tags and modifiers are locked in automatically.

- Reconciling ERAs and fighting denials immediately within the strict resubmission window so you get paid without lifting a finger.

That is exactly why The Bowerbirds handles the entire operational lifecycle. We manage your claims, track prior authorizations, and resolve denials within their strict windows without ever touching a percentage of your revenue. Contact us today to know more about how our dedicated insurance billing services can safeguard your practice's revenue for a flat $999 monthly fee.

Disclaimer: Billing rules and regulations vary significantly by individual insurance payers and state laws. The information provided in this article is for general educational guidance only and does not constitute payer-specific or legal advice.

Faqs

Q1: Is 90837 Audited More Than Other Codes?

Yes. Because it reimburses at the highest rate for standard outpatient individual psychotherapy, insurance algorithms actively track the percentage of 90837 claims your practice submits. If it significantly exceeds regional peer averages, it increases your risk for pre-payment reviews.

Q2: Can I Bill 90837 For Telehealth?

Yes, you can use 90837 for video sessions provided you use a secure, HIPAA-compliant platform. To ensure it is paid, you must use the proper telehealth place of service code (02 or 10) and attach modifier 95.

Q3: How Many Times Can I Resubmit A Denied Claim?

Many payers accept one corrected claim before requiring a formal appeal, although policies vary. If it is denied a second time, you must pivot to a formal, manual redetermination or appeals process, which involves mailing physical clinical notes to prove medical necessity.

Q4: Should I Switch Everyone To 90834 To Avoid Denials?

No, you shouldn't undercode out of fear. Consistently billing 90834 for sessions that legitimately qualify for 90837 can result in unnecessary revenue loss. If a psychotherapy session lasts 53 minutes or longer and the clinical circumstances support the extended service, 90837 may be appropriate. To reduce the risk of denials, ensure your documentation accurately reflects the time spent providing psychotherapy, clearly supports medical necessity, and meets your payer's documentation requirements.

— Talk to us

The Bowerbirds is a back-office team for solo therapists — billing, credentialing, intake, books — flat $999/month, no contract. Book a 20-minute call at the-bowerbirds.com, email hello@the-bowerbirds.com, or call (951) 223-5782.

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