Billing for Group Therapy (CPT 90853): Common Denial Reasons

Group therapy claim paperwork can quickly become a nightmare and cause revenue leakage if your claim management process is broken. 

The reason? 

Because one group session doesn’t mean one simple claim. You may see multiple patients at once, but you still have to handle their insurance, documentation, authorization, and medical-necessity requirements individually under CPT 90853.

The volume is significant too. Between 2018 and 2024, CPT 90853 was billed in 35.6 million Medicaid claims, representing $1.28 billion in payments. 

With so many claims in play, even small billing or documentation errors can lead to denials. So, what are the most common CPT 90853 billing denial reasons, and how can practices avoid them? Let’s take a look. 

Why Is Billing for Group Therapy Challenging?

From the therapist’s perspective, group therapy may look like one appointment. But billing it is more like managing several individual claims at once. That’s what makes CPT 90853 billing particularly challenging. 

Each Patient Has Individual Billing Requirements

One group session can involve several patients with different information, such as insurers, eligibility status, and authorization requirements. One patient’s claim can be paid while others are denied for completely different reasons. 

Documentation Should Support Each Patient’s Treatment

Documentation must be thorough and support each patient’s participation and treatment, even if the session is shared. A generic group note may not provide enough information to establish the medical necessity of the service for an individual patient.

Payer Requirements Can Vary

If you’re conducting a group therapy session with, say, 15 people, each patient will likely have different payer requirements. One may require prior authorization, another may have different coverage limits, while another may need additional documentation. The session is the same, but the billing requirements can vary from patient to patient. 

Common CPT 90853 Denial Reasons

CPT 90853 claims can be denied for several reasons, but many stem from preventable billing, documentation, or authorization issues. Here are some of the most common reasons to watch out for: 

1. Incorrect CPT or Diagnosis Coding

Incorrect CPT or ICD-10 coding can cause a claim to be denied or classified as an improper payment. Studies show that incorrect medical coding accounts for more than 2.6% of all claim denials. It’s a menial but high-consequence error. 

For example, using 90853 for a service that doesn’t meet the requirements for group psychotherapy or submitting an unsupported diagnosis can create a billing issue. The Centers for Medicare & Medicaid Services (CMS) confirms that 90853 represents group therapy and requires a covered diagnosis to establish medical necessity. 

2. Incomplete or Insufficient Documentation

The same CMS study also notes that insufficient documentation accounted for the most claim denials. In 2024, 78.3% of improper payments for outpatient psychiatry services were linked to insufficient documentation, while 17% were linked to no documentation. It’s clear that a simple generic note saying “patient participated in group” may not adequately support that individual’s treatment. 

3. Missing or Invalid Prior Authorization

Some insurers require prior authorization for behavioral health services. Failing to obtain or even maintain the required authorization can result in a denial. For example, a patient may be approved for only 10 group sessions, but you submit an additional one without checking the remaining authorized visits. 

4. Eligibility and Coverage Issues

Tracking eligibility can get tricky in group therapy. For each individual, you need to know when their insurance status changes, even if they continue attending therapy. An inactive policy, changed benefits, or lack of coverage for group psychotherapy can result in a denied claim. 

5. Medical Necessity Not Established

Similar to individual therapy, patients in group psychotherapy also need proper documentation as to why they need a treatment in the first place. CMS specifically requires a covered diagnosis to establish medical necessity for 90853. Payers can deny claims if the diagnosis, treatment plan, or clinical notes don’t establish medical necessity. 

6. Incorrect Patient or Provider Information

In group therapies, it is easy for practices to mix up patient information. An incorrect member ID, patient demographic, provider NPI, or credentialing detail can cause the payer to reject or deny the claim before reimbursement. 

7. Same-Day or Duplicate Billing Issues

You cannot bill for the same patient on the same day. CMS limits 90853 to one unit per day for the same beneficiary, with exceptions for distinct sessions. 

8. Payer-Specific Billing Requirements Not Met

Payer rules can differ for authorization, documentation, modifiers, and reimbursement. While one insurer can accept a particular claim, you cannot expect another insurer to accept it too. This makes it important to verify each payer’s current billing guidelines before submission. 

How to Prevent CPT 90853 Claim Denials

While billing for group therapy can seem like a lot of work and to-dos, you can take some preventive measures to avoid claim denials. 

• Verify eligibility and authorization before the session: For each patient, check whether their insurance is active and covers group psychotherapy. If it doesn’t, suggest alternative care options based on their insurance eligibility. Check authorization requirements, approved sessions, and expiration dates before onboarding the patient. Practices can also use eligibility and benefits verification services to confirm coverage and identify potential issues before providing the services. 
• Maintain individualized group therapy documentation: Your documentation needs to be top-notch. That means it must clearly reflect each patient’s participation, treatment, progress, and medical necessity. Avoid relying solely on a generic group note for every participant.
• Review coding and claim details before submission: Double-check the CPT 90853, its requirements, diagnosis codes, patient information, and provider details. A quick review before claim submission can save time by catching mistakes early. 
• Confirm payer-specific requirements: Since we saw that payer-specific requirements are one of the major reasons for claim denials, don’t assume that the same billing rules apply to every insurer. Check each payer’s requirements for authorization, documentation, coding, modifiers, and reimbursement. 
• Track denials and identify recurring issues: Monitor denied claims and look for patterns. Do they always occur with one specific payer or a type of therapy? If several patients in the same group are denied for the same issue, address the process rather than fixing each claim individually. 

When Should You Outsource Group Therapy Billing?

Group therapy billing can become increasingly difficult as your practice grows and the number of patients, payers, and claims increases. If your team spends too much time on eligibility checks, claim follow-ups, and documentation reviews, outsourcing your RCM can take some of that workload off your plate. 

Arule Health’s denial management services can help identify recurring denial patterns, manage claim corrections and appeals, and address the root causes of group therapy denials.

FAQs About CPT 90853 Billing

What Is CPT 90853 Used For?

CPT 90853 is used to bill for group psychotherapy other than multiple-family group psychotherapy. The service must be medically necessary and supported by appropriate documentation.

What Documentation Is Required for CPT 90853?

Documentation should support the patient’s participation, therapeutic interventions, treatment goals, progress, and medical necessity. CMS also recommends documenting the therapy time for 90853.

Why Are CPT 90853 Claims Denied?

Common reasons include incorrect coding, incomplete documentation, missing authorization, eligibility issues, unsupported medical necessity, incorrect patient or provider information, and payer-specific billing errors.

Can CPT 90853 Be Billed for Each Patient in a Group?

CPT 90853 represents group psychotherapy, but billing requirements can vary by payer. Practices should follow the applicable payer’s rules for reporting the service, documentation, and units. CMS guidance treats 90853 as a group psychotherapy service and specifies its unit-of-service rules.

How Can Practices Reduce CPT 90853 Claim Denials?

Verify eligibility and authorization before sessions, maintain individualized documentation, check coding and claim details before submission, and follow payer-specific requirements. Tracking denial patterns can also help identify recurring billing issues before they affect more claims.