The Collaborative to Advance Social Health Integration (CASHI) is composed of a community of 21 innovative primary care teams and community partners committed to increasing the number of patients, families and community members who have access to the essential resources they need to be healthy. CASHI focused efforts to improve social health practices, spread them to additional sites, and work toward financial sustainability plans. This report discusses the key learnings and successes as a result of this 18-month collaboration to spread social health integration.