Utah Jazz general manager Justin Zanik revealed he's been dealing with a serious health condition .... admitting he was in kidney failure after he was diagnosed with a disease that left only 14% of the organ's function.
The 49-year-old got into detail about the discovery on Monday ... explaining his wife, Gina, was concerned that he looked thinner and tired -- so she begged him to get a physical after missing the last eight annual exams.