Group Therapy Billing 90853 + T1015 — 2026 Complete Guide

90853 — Group Psychotherapy

• Per-participant billing (each patient generates a claim)
• Minimum 2 unrelated patients per session
• Maximum group size varies by payer (typically 8-12)
• Requires per-participant progress note
• Reimbursement typically $30-$60 per participant

T1015 — HCPCS Encounter Code

• State Medicaid encounter bundling code
• Per-visit billing (all services during visit)
• Not typically for individual therapy
• State-specific rules apply

Common Denials

1. Missing individual progress note per participant
2. Group size too small (under minimum) or too large (over max)
3. Duplicate patient enrollment
4. Wrong POS or modifier

Group Therapy Billing

– KD, Revenant Care