Understanding the economic and healthcare burden of metabolic dysfunction-associated steatohepatitis: a real-world claims data analysis from Germany.

Aim: Metabolic dysfunction-associated steatohepatitis (MASH) is a progressive form of metabolic dysfunction-associated steatotic liver disease, linked to hepatic and extra-hepatic complications and substantial healthcare costs. Despite its clinical and economic impact, real-world evidence on disease progression and costs in Germany is limited. Materials & methods: We conducted a retrospective cohort study using statutory health insurance claims from the InGef database (2016-2023), covering 4.7% of the German population. Patients with MASH were identified using ICD-10-GM code K75.8, in absence of the more specific code in the German coding system. Baseline characteristics and comorbidities were assessed over 2 years prior to index diagnosis. Progression was defined by transitions through end-stage liver disease (ESLD) stages: compensated cirrhosis, decompensated cirrhosis, hepatocellular carcinoma and liver transplantation. Healthcare costs were analyzed descriptively and via regression models. Results: Among 4710 patients with MASH (prevalence: 0.15%), 39.4% had documented ESLD during follow-up (mean follow-up in days 1530). Disease progression to ESLD occurred in 26.0% of patients without baseline ESLD (n = 922/3490), whereas 4.0% of patients with baseline ESLD (n = 48/1188) progressed to a more severe ESLD stage during follow-up, with a mean time to first progression of approximately 25.3 months. Patients with ESLD incurred annual costs of €12,737 versus €4928 for those without ESLD. Progression to hepatocellular carcinoma and liver transplantation resulted in predicted costs of €12,948 and €75,719 per patient-year, respectively. Mortality was significantly higher among patients with ESLD (incidence rate ratio: 4.65; 95% CI: 3.76-5.79). Discussion: Over a quarter of identified patients with MASH already had advanced liver disease at baseline, suggesting potential underdiagnosis or late recognition in routine clinical practice. Early detection, proactive management and targeted therapies are essential to reduce progression and economic burden.