My Father Is 80 Type 2 Diabetes , Atrial Arrhythmia,

My father is 80 type 2 diabetes , atrial arrhythmia, swollen legs and finding it increasingly difficulty to walk. Based in UK has poor Heath care through NHS, his doctor said his numbness in legs is due to diabetes, reality is his diabetes was recently diagnosed. What help can he get if fly to US for comprehensive health check