TY - JOUR AU - R. L. Weir AU - L. Pak AU - C. M. McCullough AU - G. M. Hindmarch AU - S. J. Mendon-Plasek AU - B. A. Griffin AU - K. E. Watkins AU - A. R. Dopp A1 - AB - OBJECTIVE: Considerable time spent on delivering the collaborative care model (CoCM) for patients with co-occurring opioid use and mental health conditions is not billable under relevant billing codes for Medicare or Medicaid behavioral health integration. In this follow-up study, the authors explored associations between patients' characteristics and the likelihood of receiving unbillable services. METHODS: Billable time was estimated by applying billing code rules to documentation of CoCM delivery from a clinical trial (N=381 patients). Multivariate logistic regressions revealed patient characteristics associated with receiving >15 minutes in ≥1 months of unbillable outreach before CoCM engagement or care time that exceeded code maxima. RESULTS: Overall, 43% of the patients received unbillable outreach, and 59% exceeded billable time. Health system, age, stimulant use, and worry about housing were significantly or marginally associated with exceeding billable time; health system also predicted unbillable outreach. CONCLUSIONS: Policymakers should consider modifying CoCM billing codes to adequately reimburse efforts to engage and serve this complex patient population. AD - RAND, Santa Monica, CA.; Department of Health Policy and Management, Fielding School of Public Health, University of California, Los Angeles, Los Angeles. AN - 42014956 BT - Psychiatr Serv C5 - Financing & Sustainability; Opioids & Substance Use CP - 8 DA - 08/2026 DO - 10.1176/appi.ps.20250715 DP - NLM ET - 20260422 IS - 8 JF - Psychiatr Serv LA - eng N2 - OBJECTIVE: Considerable time spent on delivering the collaborative care model (CoCM) for patients with co-occurring opioid use and mental health conditions is not billable under relevant billing codes for Medicare or Medicaid behavioral health integration. In this follow-up study, the authors explored associations between patients' characteristics and the likelihood of receiving unbillable services. METHODS: Billable time was estimated by applying billing code rules to documentation of CoCM delivery from a clinical trial (N=381 patients). Multivariate logistic regressions revealed patient characteristics associated with receiving >15 minutes in ≥1 months of unbillable outreach before CoCM engagement or care time that exceeded code maxima. RESULTS: Overall, 43% of the patients received unbillable outreach, and 59% exceeded billable time. Health system, age, stimulant use, and worry about housing were significantly or marginally associated with exceeding billable time; health system also predicted unbillable outreach. CONCLUSIONS: Policymakers should consider modifying CoCM billing codes to adequately reimburse efforts to engage and serve this complex patient population. PY - 2026 SN - 1075-2730 SP - 767 EP - 771+ ST - When Billing Codes Fall Short: Unbillable Time in Collaborative Care for Co-occurring Opioid Use and Mental Health Conditions T1 - When Billing Codes Fall Short: Unbillable Time in Collaborative Care for Co-occurring Opioid Use and Mental Health Conditions T2 - Psychiatr Serv TI - When Billing Codes Fall Short: Unbillable Time in Collaborative Care for Co-occurring Opioid Use and Mental Health Conditions U1 - Financing & Sustainability; Opioids & Substance Use U3 - 10.1176/appi.ps.20250715 VL - 77 VO - 1075-2730 Y1 - 2026 ER -