One of the key advances in digital healthcare is the implementation of digital triage, which, using online tools, web, and mobile apps, allows for efficient assessment of patient needs, prioritizing cases, and directing them to appropriate healthcare services. Many existing digital triage systems are questionnaire-based, guiding patients to appropriate care levels based on infor-mation (e.g., symptoms, medical history, and urgency) provided by the patients answering questionnaires. Such a system often uses a deterministic model with predefined rules to determine care levels. It faces challenges with incomplete triage interviews since it can only assist patients who finish the process. In this study, we explore the use of machine learning (ML) to predict outcomes of unfinished interviews, aiming to enhance patient care and service quality. Predicting triage outcomes from incomplete data is crucial for patient safety and healthcare efficiency. Our findings show that decision-tree models, particularly LGBMClassifier and CatBoostClassifier, achieve over 80% ac-curacy in predicting outcomes from complete interviews while having a linear correlation between the prediction accuracy and interview completeness degree. For example, LGBMClassifier achieves 88,2 % prediction accuracy for interviews with 100 % completeness, 79,6% accuracy for interviews with 80% complete-ness, 58,9 % accuracy for 60 % completeness, and 45,7% accuracy for 40% completeness. The Tab Transformer model demonstrated exceptional accuracy of over 80 % for all degrees of completeness but required extensive training time, indicating a need for more powerful computational resources. The study highlights the linear correlation between interview completeness and predictive power of the decision-tree models.