AutoCAD Visual LISP / AutoLISP :: Add Sequential Number As Suffix To Specific Attribute?

I currently have a LISP routine that will replace the value of a specific attribute name with sequential numbers in the order that the blocks are selected. Like TCOUNT for attributes - and it only looks for a specific attribute Tag Name called "ID".

However, what I want it to do now, instead of just putting the number into the attribute value, I want the number to be a suffix to the existing default tag value of the tag named "ID" which is "ADDRESS:" for some blocks and "ELEVATION:" for other blocks but the tag name that the routine always has to filter for is "ID". That way the user can pick anywhere on the block - not being forced to pick the tag we want to add numbers to.

What I need the new LISP to do is append a space and then a number to the existing tag value in the block, so that the result would look like "ADDRESS: 1", "ADDRESS: 2", "ADDRESS 3" or "ELEVATION: 1", ELEVATION: 2", etc. depending on whatever the default value for the tag "ID" is.

there are several hundred different block names - but they all have a Tag Name of "ID" - whose default value is sometimes "ADDRESS:" and sometimes "ELEVATION:".