Yes, those salaries will generally include by health insurance- the overwhelming majority of full time US workers do have access to health insurance through thier employer (https://www.bls.gov/news.release/pdf/ebs2.pdf). The number tends to go higher as you get out of low wage, low margin industries like food service.

Many employers (and probably most direct employers of software engineers) will also offer additional benefits like subsidized tax advantage retirement savings plans (401k's, very common), wellness/fitness programs (common, but varied in extent), or subsidized stock purchase programs (less common.) Those benefits can easily add up to an extra 5-10% of income.