SIMRS support service quality and interdepartmental coordination are recognized as critical determinants of operational efficiency in hospital outpatient services, yet their joint associations with staff-perceived workflow efficiency have received limited empirical examination in Indonesian regional public hospitals. This cross-sectional survey examined these associations among 200 SIMRS users at RSUD Banyumas, Kabupaten Banyumas, West Java, Indonesia. Participants were drawn from six outpatient-related work units. Instruments comprised 17 Likert-scale items assessing SIMRS service quality (five items, α = 0.883), interdepartmental coordination (seven items, α = 0.889), and perceived outpatient workflow efficiency (five items, α = 0.893). Exploratory factor analysis confirmed a three-factor structure (KMO = 0.907). Multiple linear regression revealed that both predictors were positively and significantly associated with perceived outpatient workflow efficiency. In the main model, SIMRS service quality (B = 0.313, β = 0.306, 95% CI [0.187, 0.440], p < .001) and interdepartmental coordination (B = 0.407, β = 0.344, 95% CI [0.261, 0.554], p < .001) each independently predicted efficiency perceptions, together accounting for 24.8% of the variance (adjusted R² = .248, F(2, 197) = 33.85, p < .001). Both associations remained stable after adjusting for tenure, daily SIMRS use, and work unit. These findings suggest that investments in SIMRS technical support responsiveness and cross-unit communication quality are associated with more favorable staff perceptions of outpatient workflow efficiency. Hospital managers are encouraged to prioritize both SIMRS support infrastructure and structured coordination mechanisms.
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