Praise be to Allaah.
If it really happened as you say, that this man had lost
consciousness during that period – including the month of Ramadaan – when he
was not aware of anything as a result of the accident, then he does not have
to make up the fasts and prayers that he missed during the days when he was
unconscious. This is according to the more correct of the two scholarly
opinions, and is because he was not accountable or required to do those acts
of worship during that period.
And Allaah is the Source of strength. May Allaah send
blessings and peave upon our Prophet Muhammad and his family and
companions.