My question involves collection proceedings in the State of: New York

I received a dept collection letter for my kids medical bills from 2005, it is now 2011, I had insurance at the time, but haven't worked for that company in 6+ years. I have no idea what this is for or why it wasn't paid etc does this apply?
N. Y. Civil Practice Law and Rules: Chapter Eight of the Consolidated Laws, Article 2 - Limitations of Time:

214. Actions to be commenced within three years: for non- payment of money collected on execution; for penalty created by statute; to recover chattel; for injury to property; for personal injury; for malpractice other than medical or dental malpractice; to annul a marriage on the ground of fraud.