Our primary objective was to determine to what extent a collaborative intervention improves chronic pain-related outcomes (pain-related function, pain severity and depression severity) in a VA primary care setting over six and 12 months. We also investigated to what extent the intervention affected 1) treatment of comorbid depression, 2) adherence of providers to guidelines for chronic pain, 3) patient and provider satisfaction and attitudes related to chronic pain treatment, and 4) incremental benefit (pain disability-free days) and incremental health services costs.