 ICD-11 also proposes identifying a distinct group with complex post-traumatic stress disorder (CPTSD), who have more often experienced multiple and sustained traumas and have greater functional impairment than those with PTSD.A diagnosis of PTSD requires that the person has been exposed to an extreme, life-threatening stressor.Any stressor can result in a diagnosis of adjustment disorder and it is an appropriate diagnosis for a stressor and a symptom pattern that does not meet the criteria for PTSD.