Among 167,176 patients with chronic total occlusions—complete blockages in coronary arteries—those participating in cardiac rehabilitation showed a 32% reduction in death risk over five years (HR 0.68). The protective effect persisted even when excluding patients with other cardiac procedures, suggesting rehabilitation benefits extend beyond post-surgical recovery. This finding addresses a critical gap in coronary care. While successful surgical reopening of chronic total occlusions improves symptoms, randomized trials have failed to demonstrate consistent survival benefits from the procedures themselves. The current analysis suggests structured exercise and lifestyle interventions may provide the mortality benefit that revascularization alone cannot deliver. However, significant limitations warrant caution. This observational study from electronic health records cannot establish causation—patients choosing rehabilitation may have unmeasured health advantages. The propensity matching, while sophisticated, cannot account for motivation, socioeconomic factors, or physician bias in rehabilitation referrals. As a preprint awaiting peer review, these results require independent validation. The findings nonetheless suggest cardiac rehabilitation deserves greater emphasis in chronic total occlusion management, potentially offering a non-invasive pathway to improved survival where invasive interventions have fallen short.