Mumbo you are correct about
the 100 employee rule, I should have explained that USS where I worked had you sign up for part a and I know the mining company where my brother-in-law worked also had him sign up for part a. At USS medical insurance was free so nothing really changed for the employee. After I retired there were different rules for under 65 and over 65
randyd, found a pretty good site talking about
medicare and employer insurance check it out maybe might help.
https://boomerbenefits.com/new-to-medicare/medicare-and-employer-coverageLarry