Background: The Model for End-stage Liver Disease excluding the international normalised ratio (INR, MELD-XI) and modified MELD, which uses albumin in place of the INR (MELD-Albumin) scores reflect liver and renal function and are predictors of mortality. However, their prognostic value in acute pulmonary embolism (APE) has not been studied.Methods: We assessed the predictive value of the MELD scores in patients diagnosed with high-risk APE admitted to the intensive care unit (ICU). The primary outcome was 30-day mortality.Results: Of the 273 patients included in the study, 231 were survivors and 42 were non-survivors. The mortality rate was 15.3%. The mean Meld-XI and MELD-Albumin scores were significantly higher in the non-survivors than in the survivors (MELD XI, 11.8 ± 1.8 and 10.6 ± 1.43, respectively; p = 0.002; MELD-Albumin, 10.5 ± 1.6 and 8.7 ± 1.1, respectively; p = 0.001). The multiple logistic regression analysis identified the MELD-XI (hazard ratio [HR]: 3.029, confidence interval [CI]: 1.06–1.21, p = 0.007) and MELD-Albumin (HR: 1.13, CI: 1.06–1.21, p = 0.002) scores as independent predictors of mortality. Receiver operating characteristic analysis revealed that the predictive power of the MELD-Albumin score (0.871 ± 0.014; p < 0.001) was higher than those of the MELD-XI (0.726 ± 0.022, p < 0.001), APACHE III (0.682 ± 0.024, p < 0.001), and PESI (0.624 ± 0.023, p < 0.001) scores.Conclusions: The MELD-Albumin score is an easily calculable, reliable, and practical risk assessment tool and independent predictor of 30-day mortality in patients with high-risk APE.