we have no overview in relation to what is and isnt when it comes to the stats and im sire that IRCC wont share it with is ,most of it if not all are reviewed 0n a case by case ( my personal opinion and only based on the privacy laws in relation to these matters )No list but that tends to be one of the biggest reason. Kidney failure usually progressive, dialysis and transplant are expensive, immigrant population to Canada has high volume of diabetes and CKD (South East Asian communities), etc. so CKD comes up frequently in applications.