Group Therapy Billing (CPT 90853): Rules, Group Size, Documentation and Denials

Bill 90853 once for each member who attends a group psychotherapy session, under that member’s own insurance and diagnosis, with a separate note for each member. CPT sets no time or group size for 90853, but many payers do, so check each payer’s rules for session length and maximum group size, and make sure the group is psychotherapy, not education or support.

Group therapy lets a practice treat more patients per clinician hour, but one group session creates several claims at once. A small setup error, such as the wrong group size, missing individual notes or the wrong co-facilitator billing, repeats across every member.

The basics of 90853

Rule	What it means
One claim per member	Each attending member is billed separately under their own insurance
Psychotherapy only	The group must provide psychotherapy; education or peer support groups do not qualify
No CPT time requirement	Payers often set a minimum session length; record start and stop times
No CPT group size limit	Many payers and Medicaid programs set a maximum, often 8 to 12
One billing clinician per member	Co-facilitators usually do not bill separately for the same member
Add-on available	Interactive complexity (90785) may be added when its conditions are met
Multiple-family groups	Use 90849, not 90853

Documentation for each member

Each member’s record needs its own note for every group session:

1. Date, start and stop times, and the group’s name and focus.
2. The member’s diagnosis and treatment plan goals the group addresses.
3. The member’s participation, such as what they discussed, practiced or responded to.
4. The interventions used in the group.
5. Progress, and any change to the plan.

Copying the same note into every member’s record is a common audit finding. A short group summary plus a few individual sentences per member is the safer pattern.

Group size and session length

CPT does not define either, so payer policy decides. Before you launch a group:

• Check the maximum group size for each payer your members use. Medicaid programs are often the strictest.
• Check the minimum session length; many payers expect 45 to 60 minutes.
• Plan for no-shows. Bill only the members who attended.

Telehealth groups

Many payers cover 90853 by telehealth with their own place-of-service and modifier rules; see our telehealth billing guide. Members must be in a state where the group’s clinician is licensed, which matters for online groups that draw from several states.

Group therapy in IOP and PHP programs

Intensive outpatient and partial hospitalization programs often bill group therapy as part of a program, sometimes with per diem codes instead of 90853, depending on the payer and the program’s licensing. See our IOP billing guide.

Common denials

Denial	Usual cause	Fix
Over the group size limit	More members than the payer allows	Check each payer’s maximum before scheduling
Not psychotherapy	Education, support or skills class billed as 90853	Bill 90853 only for group psychotherapy
Missing individual note	One shared note for all members	Write a note for each member
Duplicate billing	Two co-facilitators billed the same member	One clinician bills each member
Out of network or not covered	Member’s plan or behavioral health carve-out not verified	Verify each member’s benefits before the first session

For individual therapy codes, see 90837 vs 90834 vs 90832, and for family sessions see 90846 vs 90847.

This guide is general information, not legal or coding advice. Codes and payer rules change, so check current CPT guidance and each payer’s policy before billing.

How RevenueCTRL can help

We bill group therapy for group practices and behavioral health programs, with one claim per member, payer-specific group rules checked before submission, and denials worked within 5 business days. Starting a new group? A free 90-day claims audit is a good first step.

Frequently asked questions