Outpatient Follow-Up and 30-Day Readmissions: A Systematic Review and Meta-Analysis.

Abstract

Outpatient follow-up after discharge has been associated with reduced 30-day readmissions. Since universal follow-up is not feasible, identifying for whom and when outpatient follow-up is most beneficial is essential for optimizing resources and reducing readmissions. To quantify the association between outpatient follow-up within 30, 14, and 7 days postdischarge and 30-day all-cause readmissions and assess differences in outcomes by disease, age, and baseline readmission risk. MEDLINE (via PubMed), Embase, and CINAHL were searched for studies published between January 1, 2000, and August 4, 2025, using terms related to outpatient follow-up and readmissions. English-language studies assessing the association between outpatient follow-up within 30 days of hospital discharge and 30-day all-cause readmissions among adult inpatients were included. Following Preferred Reporting Items for Systematic Review and Meta-Analyses guidelines, 2 reviewers independently screened titles and abstracts. Data were extracted by 1 author and verified by another, and quality assessment was done independently by 2 authors. The primary outcome was all-cause 30-day readmission. Secondary outcomes included all-cause 30-day emergency department (ED) discharge and mortality. Pooled effect sizes (relative risk ratios [RRRs]) were estimated by disease and age group using multilevel random-effects models. Eighty-three studies were included in the review and 76 in the meta-analysis. Outpatient follow-up within 30 days vs no follow-up was associated with a reduction in risk of 30-day all-cause readmission (RRR, 0.68; 95% CI, 0.60-0.75), with less reduction (RRR, 0.78; 95% CI, 0.67-0.89) when restricted to studies with low to moderate risk of bias (ROB). Among patients with heart failure (HF) and acute myocardial infarction (AMI), the RRRs for 30-day follow-up in studies with low to moderate ROB were 0.65 (95% CI, 0.48-0.83) and 0.56 (95% CI, 0.32-0.80), respectively. Subgroup analysis using studies with low to moderate ROB showed benefits of 30-day follow-up only among patients aged 65 years or older with HF (RRR, 0.65; 95% CI, 0.48-0.83), AMI (RRR, 0.56; 95% CI, 0.32-0.80), and other diseases such as stroke and chronic obstructive pulmonary disease (RRR, 0.73; 95% CI, 0.59-0.87). Early follow-up vs no follow-up within 14 and 7 days was associated with a significant reduction in readmissions only among patients aged 65 years or older with HF (14 days: RRR, 0.63 [95% CI, 0.40-0.87]; 7 days: RRR, 0.68 [95% CI, 0.47-0.89]) and AMI (14 days: RRR, 0.57 [95% CI, 0.22-0.91]; 7 days: RRR, 0.63 [95% CI, 0.34-0.92]). In this systematic review and meta-analysis, outpatient follow-up within 30 days was associated with reduced 30-day readmissions, but the association varied by patient age and disease type, indicating a need for targeted rather than universal follow-up.