“…Some challenges of this model 122 include the limited number of MH clinicians interested and trained in working in the primary care setting; high demand resulting in rapid filling of patient caseloads and subsequent inability to accept new patients; use of "warm handoffs" and other strategies to increase referral completion that may be non-reimbursable and may interfere with MH specialist historic workways (uninterrupted lengthy visits); limited opportunities for true teambased care, thereby perpetuating interprofessional "silos"; limited ability to provide non-reimbursable care coordination and preventive services; and uneven insurance coverage and, to some degree, the same patient/family cost, inconvenience, and stigma as experienced in the external referral model. Moreover, the benefits of co-located models appear to be modest in both adult 103,123 and pediatric [104][105][106]124 populations.…”