The reports of your father states that creatinine
levels and potassium levels are high.
You should get these values repeated.If you still find them high,then it gives a strong suspicion of diabetic nephropathy
and then you must consult a nephrologist
for further treatment.
However a level of potassium as 6.3 is moderately high and seems to be a pseudohyperkalemia because otherwise your father would have had severe problems.
But still you should get these values repeated because if these values are really high then entirely different treatment would have to be instituted in your father.