ICD-10 Code F43.8 – Other reactions to severe stress (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F43.8 – Other reactions to severe stress
What it is
F43.8 is used for stress-related psychological reactions that do not fit a more specific ICD-10 diagnosis in the severe stress group. It covers other clearly documented reactions to major stressors.
Clinical signs
Clinical features vary; refer to documentation. You may see emotional distress, anxiety, low mood, irritability, sleep disturbance, or difficulty coping after a major stressor.
When to use this code
Use this code when the record describes a stress reaction related to a major life event or traumatic stressor, but the clinician does not document a more specific F43 diagnosis. It is appropriate when the presentation is real and clinically significant, yet not otherwise classified.
Do not use for
Do not use F43.8 when documentation supports a more specific adjustment disorder, acute stress disorder, or post-traumatic stress disorder. Check documentation if the diagnosis is vague or the stressor-response relationship is unclear.
Coding tip
Code the documented stress reaction only when the provider links symptoms to the stressor and no more specific diagnosis is stated.