This example displays the numbers for all bookmarks in your document as a msgBox. Since it appears your numbers vary in size, I'm extending the range as long as their are numbers in it. In the code below, you can see the line where your bookmark value from the document is being stored as the var, bookmarkValue.
It was being stored in the previous example as "code", so as Italophile mentioned, you are already storing it as a variable.
Next question for you - What are you going to do with the variable once you have it?
Posting a sample Word document (not screen shots) with the actual bookmarks you're trying to work with, and details about your end goal would be helpful.
This is like a mystery that we're learning a little more with each iteration
Code:
Sub bookmarkValues()
Dim rng As Range
Dim bm As Bookmark
Dim rng_expanded As Range
Dim bookmarkValue As String
For Each bm In ActiveDocument.Bookmarks
Set rng = bm.Range
If rng.Start = rng.End Then
Set rng_expanded = rng
rng_expanded.MoveEndWhile cset:="0123456789"
' Store bookmark document text as a variable
bookmarkValue = rng_expanded.Text
Call MsgBox(prompt:=("Bookmark value: " & bookmarkValue), buttons:=vbOKOnly)
End If
Next bm
End Sub