CPT 90853 is billed per patient. Not per group.
If you've been submitting one claim per group session, you've been underbilling by a factor equal to your group size minus one. For an eight-person group, that's seven missed claims every time you run a session.
This is the single most common billing error in group therapy, and it compounds fast.
The Math
The 2026 Medicare national average for CPT 90853 — group psychotherapy — is $30.39 per patient per session. An eight-person group at 60 minutes generates $243.12 billed correctly. That's more than a single 90837 individual session at the same Medicare rate.
If you've been submitting one claim at $30.39 per session instead of eight, you've been collecting about 12 cents on the dollar. Over a year with weekly groups, that gap compounds into thousands of dollars in unbilled services.
The billing fix is straightforward: each patient in the group gets a separate claim for the same date of service. The CPT code is the same for each — 90853. But the claims are filed individually, per patient.
What the Documentation Has to Show
For each group session, you need two things: a global group note and an individual paragraph for each patient.
The global note documents what happened in the group: date, start and stop time, number of participants, the session focus, therapeutic modality used, and the group's overall functioning.
The individual paragraph — written separately for each patient — documents that patient's specific participation: what they said or did, their emotional presentation, how they interacted with the group, and progress toward their individual treatment goals as written in their treatment plan.
If your group notes read "Patient participated in group. Appropriate affect. No concerns," you cannot bill 90853. That documentation doesn't support individual claims and won't survive an audit.
No-Shows: Don't Bill Them
If a patient doesn't attend the session, you don't bill 90853 for them. No-show fees are handled separately outside of insurance billing and should never be submitted on a claim.
Common Denials and How to Fix Them
Duplicate claim denial. Make sure your billing software is set up to handle multiple same-date claims for group patients. Some EHRs require a specific workflow for this.
Missing GT or 95 modifier. For telehealth group sessions, the appropriate modifier is required. Check your payer's current telehealth policy — not all payers cover 90853 via telehealth.
Group size documentation missing. Some payers require the number of participants documented on the claim or in the notes. "Group of 6 patients" in the first line of your note takes two seconds.
Treatment plan not tied to group. For Medicare and many commercial payers, group therapy needs to be listed as a treatment modality in the patient's active treatment plan. If your treatment plans only mention individual therapy, add a line for group.
Start Billing It Correctly
If you've been running groups and submitting one claim per session, change your billing process going forward, update your documentation template to include the global note and per-patient paragraphs, and confirm your EHR is set up for per-patient group billing.
One workflow change. Hundreds of dollars recaptured per month.
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