Group psychotherapy
CPT code 90853 is used when a therapist provides psychotherapy to multiple patients at the same time in a group setting. This is different from individual therapy and involves interaction between group members as part of the therapeutic process.
RVU breakdown
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
Billing tips
Document the number of participants present and individual participation for each group member to justify medical necessity
Impact: Reduces audit risk and denial rate by 40-60%; payers frequently audit group therapy for appropriate group size and individual benefit
Bill 90853 once per group session regardless of number of participants; never multiply units by number of attendees
Impact: Billing multiple units for one session is considered fraudulent and can trigger immediate recoupment of overpayments plus penalties
Verify minimum and maximum group size requirements with each payer; Medicare typically expects 2-10 members, while some commercial plans require 4+ members
Impact: Sessions with only 1-2 participants may be denied; using 90832-90834 for small groups can increase reimbursement by $45-$85 per session
Keep group composition documentation showing members share similar diagnoses or therapeutic goals to support medical necessity
Impact: Prevents denials based on inappropriate grouping; maintain group rosters and treatment plan alignment documentation
Check state Medicaid and commercial payer policies for time minimums; most require at least 30-40 minutes to qualify for 90853
Impact: Sessions under minimum time threshold may be denied entirely or require modifier 52 with 50% reduction from $28.14 to approximately $14.07
For partial hospitalization or intensive outpatient programs, ensure 90853 is not bundled into per diem rates before billing separately
Impact: Unbundling violations can result in 100% denial and potential false claims liability; verify carve-out provisions in contracts
Common denials
Insufficient documentation of individual patient participation and therapeutic benefit within the group setting
How to appeal: Submit detailed session notes showing specific interventions for the patient, their participation level, therapeutic themes addressed, and individual clinical progress. Include treatment plan showing group therapy as appropriate modality for diagnosis.
Group size outside payer parameters (too few or too many participants documented)
How to appeal: Provide attendance log showing actual participants present. If below minimum, consider correcting claim to individual therapy code (90832-90834) for higher reimbursement. Include payer policy citation showing size requirements were met.
Medical necessity not established for group versus individual therapy modality
How to appeal: Submit treatment plan explicitly stating clinical rationale for group therapy (e.g., social skills deficits, peer support needs, cost-effective treatment for stable patients). Include literature supporting group therapy efficacy for the specific diagnosis.
Session duration not documented or falls below payer minimum time requirements
How to appeal: Provide corrected documentation with clear start and end times showing session met minimum duration (typically 40+ minutes). If session was genuinely shorter, resubmit with modifier 52 and request reduced payment rather than full denial.
Frequently asked questions
What is the Medicare reimbursement rate for CPT 90853 in 2025?
The 2025 Medicare national average reimbursement for CPT 90853 is $28.14 in non-facility settings and $24.26 in facility settings. These rates are based on the total RVU of 0.87 multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary by geographic locality based on the Medicare Physician Fee Schedule locality adjustments.
How many patients can be in a group therapy session for billing code 90853?
While CPT guidelines do not specify exact numbers, Medicare and most payers expect 2-10 patients for group psychotherapy. Many commercial payers require a minimum of 4 participants, and some specify a maximum of 8-10. Always verify specific payer policies, as groups with fewer than the minimum may require billing individual therapy codes instead.
Can I bill 90853 for each patient in the group?
Yes, you bill 90853 separately for each individual patient who participates in the group session. However, you only bill one unit per patient per session, regardless of session length. Never multiply units by the number of participants - each patient gets their own claim with one unit of 90853.
What is the difference between CPT 90853 and 90849?
CPT 90849 (multiple-family group psychotherapy) involves treating multiple families together where family dynamics are the focus, while 90853 treats multiple individual patients in a group format. Code 90849 was deleted from CPT in 2013, so current family group therapy is typically billed using 90853 or family therapy codes (90846-90847) depending on the clinical structure and payer policy.
How long does a group therapy session need to be to bill 90853?
CPT does not specify a minimum time for 90853, but most payers require 40-50 minutes minimum, with typical sessions lasting 60-75 minutes. Medicare does not have an explicit time requirement but expects typical professional standards. Always check individual payer policies, as sessions under the minimum threshold may require modifier 52 for reduced services or may be denied entirely.
Can CPT 90853 be billed via telehealth?
Yes, 90853 has been widely covered via telehealth since the COVID-19 public health emergency. Use modifier 95 or GT (depending on payer preference) for synchronous audio-video sessions. As of 2025, Medicare continues to cover group psychotherapy via telehealth. Verify state Medicaid and commercial payer policies, as some have ended pandemic-era telehealth flexibilities while others have made them permanent.
What diagnosis codes are typically used with CPT 90853?
Common ICD-10 codes billed with 90853 include F32.x-F33.x (depression), F41.x (anxiety disorders), F10.x-F19.x (substance use disorders), F50.x (eating disorders), F43.1x (PTSD), and F60.x (personality disorders). The diagnosis must support medical necessity for ongoing psychotherapy and explain why group modality is clinically appropriate for the patient's condition and treatment goals.