Final answer:
The appropriate action is hospice care with the diagnosis of end stage HIV/AIDS disease because the patient's severe immunodeficiency, opportunistic infections, and refusal of treatment indicate a terminal stage of the illness.
Step-by-step explanation:
The most suitable action in this case is to provide hospice care with the diagnosis of end stage HIV/AIDS disease.
Given the patient's CD4+ count of 50 cells/mcL and the clinical history of opportunistic infections (such as Kaposi's sarcoma and recurrent pneumonia), as well as chronic persistent diarrhea, the patient meets the criteria for a diagnosis of AIDS.
His declining functional status, decrease in activities of daily living (ADLs), and decision to forego antiretroviral medication and other therapies indicate that his disease has progressed to a terminal stage where palliative care is the appropriate response to improve his quality of life during end-stage illness.
The patient's high viral load also reflects the advanced state of the disease and the ineffectiveness or absence of treatment.
While he presents with congestive heart failure and renal insufficiency, these are likely complications from his advanced HIV/AIDS rather than primary diagnoses justifying hospice care.