Collaborative Care Billing Codes

Hearing that the CMS is establishing collaborative care billing codes got my hopes up that my therapists who specialize in children could begin billing for time they spend collaborating with teachers, PCA's, other providers etc.. But looking more closely at the specifics it appears these codes are only for primary providers. Does anyone know how to bill for time spent collaborating on behalf of a patient? Or is that time always considered part of the in-session billing code (i.e 90837)?