Hypertension-related edema: The patient has a history of hypertension, as evidenced by the prescription of Losartan Potassium and Amlodipine Besylate, and has not been taking his blood pressure medication as prescribed. Uncontrolled hypertension can lead to fluid retention and edema.

Venous insufficiency: The patient's recent fall and subsequent edema could be related to venous insufficiency, which is common in older adults and can be exacerbated by immobility or trauma.
Cellulitis or infection: The patient's edema, combined with a recent fall, could be indicative of a skin infection such as cellulitis, particularly if the skin is red, warm, or tender to the touch.
Deep vein thrombosis (DVT): Although less likely, DVT should be considered, especially given the patient's recent fall and immobility, which increase the risk of blood clots.

Pulmonary embolism (PE): While less likely, PE is a potentially life-threatening condition that can present with leg edema, especially if the patient has a history of DVT or recent immobility.
Cardiac failure: Uncontrolled hypertension can lead to cardiac failure, which can cause peripheral edema. It is essential to consider this diagnosis, especially if the patient has a history of cardiac disease.
Renal failure: The patient's edema could be related to renal failure, particularly if he has a history of kidney disease or if his blood work shows signs of renal impairment.

Lymphedema: This is a less common condition characterized by chronic swelling of the limb due to lymphatic system dysfunction. It is typically associated with a history of surgery, radiation, or infection.
Nephrotic syndrome: This rare condition is characterized by excessive protein loss in the urine, leading to hypoalbuminemia and edema. It would be unusual in this patient without other symptoms such as foamy urine or significant weight loss.