Study on the Safety of BAY 63-2521, How it is Tolerated and the Way the Body Absorbs, Distributes and Gets Rid of the Study Drug Given as a Single Oral Dose of 1 mg Tablet in Participants With Renal Impairment and Healthy Participants Matched for Age-, Gender-, and Weight

Inclusion criteria for all subjects: * Male and female white subjects with 18 to ≤79 years of age, BMI between 18 and 34 kg/m\^2 * Women without childbearing potential or with childbearing potential but only if the pregnancy test is negative and are under highly effective contraception Inclusion criteria for subjects with renal failure: \- Stable renal disease, ie. a serum creatinine value determined at least 3 - 6 months before the pre-study visit was not allowed to vary by more than 20% from the serum creatinine value determined at the pre-study visit Inclusion criteria for healthy subjects: \- Mean age and body weight not allowed to vary by more than +/- 10 years and +/- 10 kg from the subjects with renal impairment, respectively Exclusion criteria for all subjects: * Febrile illness within 1 week before the start of the study * Hypersensitivity to riociguat and / or to inactive constituents * Smoking Exclusion criteria for subjects with renal failure: * Resting heart rate in the awake subject below 45 BPM or above 90 BPM * Acute renal failure or nephritis * Any organ transplant * Diastolic blood pressure (DBP) \>100 mmHg and / or systolic blood pressure (SBP) \>180 mmHg * Hemoglobin \<8 g/dL, Proteinuria \>8 g/24 hours, Serum albumin \<30 g/L, Platelet count \<100 x 109/L * History of bleeding within the past 3 months * Diabetes mellitus with a fasting blood glucose \>220 mg/dL or HbA1c \>10% * Concomitant use of any medication except medications necessary for the treatment of the kidney disease or related complications * Concomitant use of phosphodiesterase-5 inhibitors, endothelin receptor antagonists (ERAs, eg bosentan), intravenous or inhalative prostacyclins, or nitrates * Concomitant use of potent CYP3A4 inhibitors Exclusion criteria for healthy subjects: * Conspicuous findings in medical history or pre-study examination * History of relevant diseases of vital organs, central nervous system, or other organs * SBP below 100 mmHg or above 145 mmHg and / or DBP above 95 mmHg * Regular daily consumption of more than 1 liter of usual beer or the equivalent quantity of approximately 40 g of alcohol in another form