There are several risk scores for mortality in patients with acute decompensated heart failure (ADHF) such as the European Collaboration on Acute Decompensated Heart Failure Score (ELAN-HF Score), the ADHF/NT-proBNP-Score or A2B-Score (age, anemia, BNP). The aim of this study was to evaluate the predictive value of such risk scores with and without addition of novel cardiorenal biomarkers. Single-center, exploratory prospective cohort study at the University Hospital Heart Centre Brandenburg. Forty-four adult patients hospitalized for ADHF. Measurement of established and novel biomarkers at hospital admission including N-terminal-pro brain natriuretic peptide (NT-pro-BNP), troponin T, creatinine, cystatin C, soluble suppression of tumorigenicity 2 (sST2), Neprilysin, Dickkopf-3 (DKK3), interleukin-6 (IL-6), growth differentiation factor-15 (GDF-15), Galectin-3, Progranulin and urine neutrophil gelatinase-associated lipocalin (uNGAL). Analysis of predictive indices of ELAN-HF, ADHF/NT-proBNP and A2B-Scores for 90-day mortality with and without adding biomarkers. AUC 0.9 as excellent predictive value. Median age was 78.0 (25th-75th percentiles 69.3-83.8) years, 50 % (22/44) were female. Twelve patients (27.3 %) died within 90 days after discharge. All three risk scores were higher in non-survivors and showed fair AUC for 90-day mortality (ELAN-HF: 0.792 [0.639-0.901], p = 0.003; ADHF-NT-proBNP score: 0.749 [0.559-0.938], p = 0.012; A2B score: 0.734 [0.541-0.927], p = 0.017). Adding troponin T, cystatin C-based estimated glomerular filtration rate (eGFR) or uNGAL to risk scores was associated with an area under the curve (AUC) >0.80 for all models. Combination of troponin T, cystatin C-based eGFR and uNGAL increased risk scores to AUC >0.91. These findings imply that further evaluation of the addition of a panel of cardiorenal biomarkers to ADHF risk scores is warranted.