Coding Instructions

for X0500, Social Security Number
•
Fill in the boxes with the Social Security number exactly as submitted for item A0600
“Social Security and Medicare numbers" on the prior erroneous record to be
modified/inactivated. If the Social Security number was unknown or unavailable and left
blank on the prior record, leave X0500 blank.
•
Note that the Social Security number in X0500 does not have to match the current value
of A0600 on a modification request. The entries may be different if the modification is
correcting the Social Security number.
0
1
0
2
1
9
1
8