The ability to:

1. Identify OCRDs (BDD, hoarding disorder, trichotillomania, excoriation [skin-picking] disorder), to distinguish them from OCD, and to diagnose them, either as primary diagnoses or as comorbid with OCD   Evidence: CR: Pertusa et al 2010 • TM: Phillips and Stein 2015 • EO: American Psychiatric Association 2013b

2. Identify when symptoms of OCRDs are the result of some other condition, such as: • stimulant drugs • basal ganglia lesions • Alzheimer’s disease (which may lead to clutter suggestive of hoarding disorder) • scabies or medical condition causing pruritus (which may mimic excoriation disorder) • seborrheic dermatitis or tinea capitis or medical condition causing skin inflammation (which may mimic trichotillomania)   Evidence: TM: Phillips and Stein 2015 • EO: American Psychiatric Association 2013b

3. Identify and diagnose patients with “other specified” OCRDs, such as: • BDD-like disorder in the presence of actual flaws in appearance • body-focused repetitive behavior disorder (e.g., nail biting, lip biting, cheek chewing) • obsessional jealousy • Koro (intense anxiety that the penis or vulva and nipples will recede into the body) • olfactory reference disorder • Olfactory reference disorder (preoccupation with the inaccurate belief that one emits a foul or unpleasant body odor, which is often accompanied by repetitive behaviors, such as checking)   Evidence: TM: Phillips and Stein 2015 • EO: American Psychiatric Association 2013b

4. Identify and diagnose major depressive disorder and bipolar disorder, either as a primary diagnosis or as comorbid with OCD   Evidence: OR: Stefanis et al 2002 • EO: American Psychiatric Association (2013b)

5. Identify and diagnose anxiety disorders – generalized anxiety disorder, social anxiety disorder, specific phobias, panic disorder (with or without agoraphobia), illness anxiety disorder – either as primary diagnoses or as comorbid with OCD   Evidence: EO: American Psychiatric Association 2013b

6. Identify psychosis and diagnose schizophrenia and other primary psychotic disorders, autism spectrum disorder, and post-traumatic stress disorder, either as primary diagnoses or as comorbid with OCD   Evidence: OR: van Os and Kapur 2009 • TM: Nutt et al 2000, Gallo et al 2010, Friedman et al 2014 • EO: American Psychiatric Association 2013b

7. Recognize and characterize the relationship between acute or chronic stress or trauma and the presentation of OCD   Evidence: OR: Adams et al 2018

8. Identify and diagnose substance use disorders, either as primary diagnoses or as comorbid with OCD, including substance abuse as self-medication   Evidence: CSS: Mancebo et al 2009 • EO: American Psychiatric Association 2013b

9. Recognize and diagnosis Tourette syndrome, other tic disorders, and attention deficit disorder, either as primary diagnoses or as comorbid with OCD   Evidence: TG: Koran et al 2007 • TM: Martino et al 2013 • EO: Tourette Syndrome Classification Study Group 1993, American Psychiatric Association 2013b

10. Recognize and diagnosis OCPD and other personality disorders, either as primary diagnoses or as comorbid with OCD   Evidence: TG: Koran et al 2007 • OR: Diedrich and Voderholzer 2015, Starcevick and Brakoulias 2017, Wheaton and Pinto 2017 • TM: Gabbard 2005 • EO: American Psychiatric Association 2013b