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Some people have made an association between body dysmorphic disorder and gender dysphoria. There is a subtype of BDD where this loss of insight that was previously seen as delusional (but is no longer conceptualized as such - it's just an obsessive compulsive spectrum disorder). However patients with BDD who have surgery are not satisfied, their distress is not abated (albeit possibly temporarily) in fact they may become worse. Conversely, those with identify as transgender who seek gender affirming surgery tend to do much better (and when they don't it is because they have other issues and may have thought everything would be miraculously better afterwards when there is no panacea).
I think the other illness that can be conflated is anorexia nervosa (which may fall into the Karl Jasper's definition of delusion). No argument will shake the conviction of someone with anorexia that they are not inhabiting a fat person's body, or even that there's something so inherently bad about being fat in the first place that its worth ruining your life.
I don't know how valid it is to use the response to surgery as a diagnostic tool -- people with body integrity identity disorder may "benefit" from surgery (http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0034702) -- the famous example is the woman who always identified as a blind person until someone finally did it, and now she's supposedly living a happy life (although that may be correlated with getting media coverage). There are a lot of drawbacks studying this -- its hard to design a study that would create a control where a person received the aid and support of a gender reassignment group (who often have excellent clinicians, social work support, support groups, etc), then somehow randomized and blinded to treatment. Maybe some would have been happy with "just" hormone therapy, or other strategies for feminization.
To answer the OP, psychiatrists will often see these patients simply because they have higher rate of psychiatric co-morbidity, but primarily as consultants to the endocrinologists and surgeons who do the work, or on the inpatient unit when they are severely disabled. For me, that led to some very skewed viewpoints, and I need to remind myself that I've only seen the worst case scenarios, disqualifying me from having any meaningful opinion (but hey, its the internet, so I can pretend).