If I understand this question, this might be a diffuse perception of the skhandas, as these are the groupings that might better translate as the identity constructs (in the modern sense).
In that case, i'm not sure there is a word or discussion of identity disorders (if that is what you're referring to) -- i've never seeing this being discussed in any text.
I have seen (modern) people talk about supposed risks of mindfulness meditation for people with specific mental disorders who already have difficulties with making sense and perceiving or associating (or too inclined to disassociate) certain things. But wether these are real risks of what specific practice and to whom exactly i'm not sure (e.g. some researchers do advocate mindfulness meditation to people with specific identity disorders). This is the closest link to buddhism and this lack of self identity i've heard of.