Shulchan Aruch rules that if a person must rewash his hands in the middle of a meal for any reason , he must recite a brocha. Other Achronim disagree and maintain that a brocha is not necessary. Mishnah Berurah offers a compromise ruling: If a person uses the bathroom for gedolim, touches excrement or leaves the meal for an extended break, he must rewash with a brocha. If he only touches a covered area, urinates, or changes a diaper without coming directly in contact with excrement, he should rewash without a brocha. Others reject this compromise and say that a person should follow one of the two views—either to always recite a brocha or to never recite one.
סי' קס"ד ס"ק יא-יד ביה"ל ד"ה לחזר ביאורים ומוספים דרשו 19