A Study to Evaluate Blood Levels of Bepirovirsen in Adult Participants With Severe or Moderate Kidney Disease

Inclusion Criteria: * Age 18 to 80 years, inclusive * Body weight greater than or equal to 50 kilograms (kg) and body mass index (BMI) within the range 19 to 40 kilograms per square meter (kg/m\^2). * Males and females may participate. Female participants must not be pregnant or breastfeeding, and must be of non-childbearing potential, or agree to use a highly effective method of contraception. * Capable of giving signed informed consent Additional inclusion criteria for renal impairment groups (Group 1 and Group 2) * Severe renal impairment \[estimated glomerular filtration rate (eGFR) adjusted for actual body surface area (BSA) less than 30 milliliters per minute (ml/min); Group 1\] or moderate renal impairment \[eGFR adjusted for actual BSA between 30 and 59 ml/min; Group 2\], from any cause other than vasculitis or glomerulonephritis Additional inclusion criteria for healthy control participants with normal renal function (Group 3) * Healthy, based on medical evaluation including medical history, physical examination, laboratory tests, and electrocardiogram (ECG). * Normal renal function (eGFR adjusted for actual BSA greater than or equal to 90 ml/min) Exclusion Criteria: * Any medical condition that could affect the absorption, metabolism, or elimination of drugs, increase the risk of taking part in the study, or interfere with interpretation of the study data. * History of vasculitis or any type of glomerulonephritis * Use of creatine-containing supplements within 30 days of screening or intended use during the study. * Current enrolment in another interventional study, or past participation in a study where an investigational medicine, vaccine or device was administered if, at the time of consent, it is within 5 half-lives or twice the duration of the biological effect (whichever is longer) of the product given in the previous study. * Received any oligonucleotide or small interfering ribonucleic acid (siRNA) within the past 12 months. * Exposure to more than 4 investigational products within the past 12 months. * A positive blood test for hepatitis B, hepatitis C, or human immunodeficiency virus (HIV). * Average weekly alcohol intake of greater than 14 drinks for males or greater than 7 drinks for females. * Current substance misuse or dependence, or a previous history of substance misuse or dependence that could interfere with ability to participate in the study. Additional exclusion criteria for renal impairment groups (Group 1 and Group 2) * History of renal transplantation or anticipated renal transplant during the study. * On dialysis or likely to require dialysis during the study. * Positive drug or alcohol screen (unless because of prescribed medication). Additional exclusion criterion for healthy control group (Group 3) * Positive drug or alcohol screen. * Urine albumin-to-creatinine ratio (uACR) \> 0.3 mg/mg (300 mg/g).