Patient presents with symptoms suggestive of Posttraumatic Stress Disorder Unspecified (PTSD Unspecified, ICD-10: F43.9, DSM-5: 309.89).  The patient reports experiencing clinically significant distress following exposure to a traumatic event, though the specific details of the trauma are currently unclear or do not fully meet criteria for PTSD as specified in the DSM-5.  Symptoms include intrusive thoughts, flashbacks, or nightmares related to a distressing experience.  The patient also exhibits avoidance behaviors, actively trying to avoid reminders of the trauma.  Negative alterations in cognitions and mood are evident, including difficulty recalling key aspects of the event, persistent negative emotional state, feelings of detachment, and diminished interest in activities.  Furthermore, marked alterations in arousal and reactivity are observed, characterized by hypervigilance, exaggerated startle response, difficulty concentrating, and sleep disturbances.  The onset and duration of these symptoms warrant further investigation to determine if they meet the full criteria for a specific PTSD diagnosis.  Differential diagnoses considered include adjustment disorder, acute stress disorder, anxiety disorder, and depression.  The treatment plan includes initiating trauma-informed therapy, specifically focusing on symptom management and exploring the nature of the traumatic experience.  Referral to a mental health specialist for a comprehensive PTSD assessment and potential evidence-based treatments, such as Cognitive Processing Therapy (CPT) or Prolonged Exposure (PE), will be considered following further evaluation.  Patient education regarding PTSD symptoms, coping mechanisms, and available resources will be provided.  Follow-up appointment scheduled to monitor symptom progression and treatment response.