Select first field from column in group value

Hello,

I need to return the first row of data grouped by the first field (Visit ID) in multi-column table:

VisitID       AdmitDate            Unit       Room          OrderCode

001041      2014-08-01         2E          202            SWCC
001041      2014-08-01         2E          202            NULL
006811      2014-08-01         2E          204            SWCC
008815      2014-08-01         2E          206            NULL
004895      2014-08-01         2E          207            SWFA
004895      2014-08-01         2E          207            SWCC
004895      2014-08-01         2E          207            NULL

To return:
001041      2014-08-01         2E          202            SWCC
006811      2014-08-01         2E          204            SWCC
008815      2014-08-01         2E          206            NULL
004895      2014-08-01         2E          207            SWFA

I currently have a group by clause with all field names; and have tried max on the OrderCode in the select that doesn't work, and FIRST isn't recognized in SSL server.  Do I need a subquery (if so, how as I'm newer to writing SQL) or what is another solution?  Thank you.