Study to Assess Drug Levels and Safety of BMS-986278 in Healthy Participants and Participants With Different Degrees of Hepatic Impairment

Inclusion Criteria: All Participants: * Must have a body mass index (BMI) between 18 and 40 kg/m\^2 (inclusive), and body weight ≥ 50 kg. Mild, Moderate, or Severe Hepatic Impairment Participants: * Mild, moderate, or severe hepatic impairment (HI) or cirrhosis due to chronic hepatic disease and/or prior alcohol use. * Mild, moderate, and severe HI participants will be enrolled according to the Child-Pugh classification score. Matched Healthy Participants: * Free of any clinically significant disease that would interfere with the study evaluations. * Normal hepatic function participants will be enrolled and matched individually with HI participants with respect to age (± 10 years), weight (± 20%), sex, and race/ethnicity (Japanese and Chinese participants vs non-Japanese and non-Chinese participants). Exclusion Criteria: All Participants: * History of alcohol abuse within 1 year prior to screening or regular use of alcohol within 6 months prior to screening that exceeds 7 units for women, or 14 units for men of alcohol per week (1 unit = 340 mL of beer 5%, 140 mL of wine 12%, or 45 mL of distilled alcohol 40%). * Must not have had any prior exposure to BMS-986278. Mild, Moderate, or Severe Hepatic Impairment Participants: * Acute liver disease (eg, caused by an acute infection or drug toxicity). * History of initial stage/planned liver transplantation within 6 months of screening or has received a liver transplant. Matched Healthy Participants: * Any significant medical condition, or psychiatric illness that would prevent participant from participating in the study. * Other protocol-defined inclusion/exclusion criteria apply.