An 89-year-old woman with known hypertensive cardiovascular disease is brought to the emergency room. A chest x-ray shows systolic congestive heart failure. She is placed on diuretics and admitted for further workup for her acute systolic failure. How is the patient's diagnosis coded?
A. I10, I50.21
B. I11.0
C. I11.0, I50.9
D. I11.0, I50.21