If you can post sample data that would help a lot... but you can do this with a vlookup by the sounds of it.
I assumed the following for the below. Doctors name is in Cell A2, on Sheet 1. Doctors insurance info is in Sheet2, and the first thing we want if the data in column B from Sheet 2....
=VLOOKUP($A$2,Sheet2!$A:$D,2,FALSE)
See below.
This was sheet 1...
<table border = "1" cellspacing = "0" bordercolor="#999999">
<tr><td bgcolor="#C0C0C0"> </td>
<td align="center" bgcolor="#C0C0C0"><b>A</b></td><td align="center" bgcolor="#C0C0C0"><b>B</b></td><td align="center" bgcolor="#C0C0C0"><b>C</b></td></tr>
<tr><td align = "center" bgcolor="#C0C0C0"><b>1</b></td><td rowspan="1" colspan="1" width="237" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#333333">Name </font></td><td rowspan="1" colspan="1" width="351" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#000000">Insuance Number </font></td><td rowspan="1" colspan="1" width="192" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#000000">Office </font></td></tr>
<tr><td align = "center" bgcolor="#C0C0C0"><b>2</b></td><td rowspan="1" colspan="1" width="237" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#333333">A doctor </font></td><td rowspan="1" colspan="1" width="351" height="30" align = "right" valign = "bottom" bgcolor ="#FFFFFF"><font color="#000000">=VLOOKUP($A$2,Sheet2!$A:$C,2,FALSE) </font></td><td rowspan="1" colspan="1" width="192" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#000000">=VLOOKUP($A$2,Sheet2!$A:$C,3,FALSE) </font></td></tr>
</table>
This was sheet2
<table border = "1" cellspacing = "0" bordercolor="#999999">
<tr><td bgcolor="#C0C0C0"> </td>
<td align="center" bgcolor="#C0C0C0"><b>A</b></td><td align="center" bgcolor="#C0C0C0"><b>B</b></td><td align="center" bgcolor="#C0C0C0"><b>C</b></td></tr>
<tr><td align = "center" bgcolor="#C0C0C0"><b>1</b></td><td rowspan="1" colspan="1" width="192" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#333333">Name </font></td><td rowspan="1" colspan="1" width="351" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#000000">Insuance Number </font></td><td rowspan="1" colspan="1" width="192" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#000000">Address </font></td></tr>
<tr><td align = "center" bgcolor="#C0C0C0"><b>2</b></td><td rowspan="1" colspan="1" width="192" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#000000">A doctor </font></td><td rowspan="1" colspan="1" width="351" height="30" align = "right" valign = "bottom" bgcolor ="#FFFFFF"><font color="#000000">123 </font></td><td rowspan="1" colspan="1" width="192" height="30" align = "left" valign = "bottom" bgcolor ="#FFFFFF"><font color="#000000">a place </font></td></tr>
</table>
But if you give us an example of the data, it will be much easier to help.