I was in a webinar yesterday with Derrin Watson and Stephen Forbes - during the Q&A this came up. It was recommended to use a Code "1" if the taxpayer is under 59 1/2 and then the taxpayer would address this when the individual's taxes are filed. I believe there was a form mentioned that allows the taxpayer, when filing, r to advise the IRS that there was an exception.
That being said, I agree that when the time arrives next January, there will be a "special" code that will be used however in this case Susan was needing a code right away.
My two cents...