Just to make sure you see my response to your original post. Using medicaid will not be considered as public charges in regard to your green card application. Google is your friend. See the following links for details:
http://www.fns.usda.gov/fsp/rules/Memo/PRWORA/99/QandAs.htm
http://209.198.129.135/products/policypages/91-110/91-110html/PP91.html