"Mild cognitive impairment" is a euphemism. I carry the diagnosis, and it means only that my cognition is somewhere between where it should be for my age, 73, and where it would be if I had full-blown dementia: there are no other intermediate classifications like moderate and severe cognitive impairment.

If you're tempted to ask exactly where you fit on the scale from normal cognition for you (and your age, if you're older, and dementia, don't waste your time. Neurology has lumped lots of levels of impaired cognition under "mild cognitive impairment" for 2 reasons: 1) it's impossible to make finer determinations of impairment and 2) even if more accurate determinations were possible, neurology doesn't have sufficient tools to remediate impairment based on its degree--other than normal (for age), dementia, and everything in between!

Good luck.