The initial interview / John Barnhill -- A 12-step evaluation of co-occurring disorders / Christine Yuodelis-Flores and Richard Ries -- Mood disorders / Rocco A. Iannucci and Roger D. Weiss -- Anxiety disorders / Rebecca A. Nejat and Maria Andrea Baez -- Posttraumatic stress disorder / J. David Stiffler and Grace Hennessy -- Psychotic disorders / Bernadine H. Han and Jonathan Avery -- Personality disorders / John Barnhill and Jonathan Avery -- ADHD / Sean X. Luo and Frances R. Levin -- Eating disorders / Sean P. Kerrigan and Evelyn Attia -- Gambling disorder / Mayumi Okuda, Silvia Franco, Ariel Kor -- Twelve-step programs / Luke J. Archibald -- Motivational interviewing / Howard Steinberg, David Pilkey, Steve Martino -- Inpatient treatment of co-occurring disorders / Zain Khalid, Sonal Batra, Erin Zerbo -- Pharmacological interventions / Jonathan Avery -- Adolescence / Shannon G. Caspersen -- Geriatrics / Caitlin Snow -- LGBTQ population / Eric Yarbrough -- Incarceration / Lauren Stossel.