A Study of Efimosfermin Alfa in Adults With Hepatic Impairment

Inclusion Criteria: * Between 18 years and 70 years of age inclusive * Body Mass Index (BMI) within the range 23 - 40 kilogram per square meter (kg/m\^2) * Male or female participants * Participant has liver cirrhosis with a grade of hepatic impairment that can be classified as a discrete Child-Pugh class. Participants must: * Have a clinical diagnosis of liver cirrhosis in the participant's medical history corroborated by previous liver biopsy, medical imaging or compatible biochemical profile, and * Be classed during Screening as one of the following Child-Pugh classes: * Child-Pugh B: Score 7-9 or * Child-Pugh C: Score 10-15 * Chronic (greater than \[\>\] 6 months) HI which is currently stable (no acute episodes of illness within the previous 1 month prior to Screening (Visit 1) due to deterioration in hepatic function). Participants must also remain stable throughout the Screening period. Assessment of the stability of the participant's hepatic function will be determined by the investigator. Exclusion Criteria: * History of extrahepatic disorders possibly related to etiology of cirrhosis. * History of cryoglobulinemia. * Participants with Grade 3 ascites or refractory ascites. * Participants with refractory encephalopathy or significant central nervous system disease * History of gastric or esophageal variceal bleeding within the past 6 months and for which varices have not been adequately treated with medication and/or surgical procedures. * Other prima…