[pcl]

Indeed. The GP's question was about "American employees", which I interpreted as "full-time employees at a company in the USA".

Contractors are subject to the health care plans of the company they work for (or whatever they buy on the individual market, if they are self-employed). Part-time employees (less than 30 hours per week, IIRC, although that's probably state-by-state) also receive different treatment. Some companies have started to manage hours to have more part-time workers instead of fewer full-time workers as a means to game the heath care laws: http://www.washingtonpost.com/blogs/wonkblog/wp/2013/05/06/w...