Background/Objectives: Digital health interventions are increasingly used to support person-centered care (PCC) in chronic disease management, yet it remains unclear which PCC components are most consistently enabled by digital tools and how these relate to outcomes. This study synthesized evidence on digitally supported PCC for adults with chronic conditions, examining how interventions operationalize PCC and which clinical, patient-reported, and implementation outcomes are reported. Methods: A structured literature synthesis was conducted according to PRISMA guidelines across a heterogeneous evidence base, including randomized and pragmatic trials, observational studies, qualitative studies, and systematic reviews. The review protocol was pre-registered in the Open Science Framework (OSF) Registries. Results: Across 16 included studies, digital solutions most consistently supported PCC through enhanced situational awareness via self-monitoring, strengthened partnership through two-way communication and coaching, and reinforced shared documentation through co-created health plans. Benefits were reported most consistently for process and experience outcomes, such as perceived access to support, engagement, and empowerment. Evidence for sustained long-term clinical improvements, such as glycemic control, was mixed and frequently limited by short follow-up periods and variation in intervention integration. Conclusions: Digitalization can strengthen PCC when embedded within relational care models and organizational workflows that translate patient-generated data into meaningful action. Future work should utilize clearer PCC operationalization, longer follow-up, and routine reporting of equity outcomes, alongside targeted training for healthcare professionals delivering PCC in digital encounters.