The Specific Aims of this Project are to: (1) evaluate the effectiveness of a telephone-delivered "blended" collaborative care intervention for treating HF and depression that could be adopted into routine clinical practice if proven effective; and (2) advance our understanding of the moderators and mediators of depression treatment on clinical outcomes. We will screen hospitalized patients with systolic HF for depression, and then randomize 625 who screen positive and have at least a moderately elevated level of depressive symptoms at two-weeks following hospital discharge to either: (1) collaborative care for treating both HF and depression ("blended"); (2) collaborative care for treating HF alone (enhanced usual care (eUC)); or (3) their doctors' "usual care" (UC). Additionally, we will enroll 125 non-depressed HF patients to better evaluate the benefits derived from treating depression (total N=750). Our co-primary hypotheses will test whether "blended" collaborative care can produce at 12-months follow-up a: (A) 0.50 effect size (ES) or greater improvement in health-related quality of life (HRQoL) vs. UC; and (B) 0.30 ES or greater improvement in HRQoL vs. eUC. Secondary hypotheses will evaluate the effects of our "blended" intervention on mood, functional status, adherence with guideline-consistent care, incidence of cardiovascular events, health care utilization, and costs.