Box 12 with code "J" would list the amount of your sick pay that was not included in boxes 1, 3 or 5. So, it may be that the W-2 is not listing your disability pay amount in box 12. However, that would not likely affect your tax since the correct taxable income should be listed in box 1. I suggest you enter the amount of the disability pay in box 12 and see if your tax changes. If not, then you can leave the box 12 entry off of your W-2 entry.
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