F43.9 Reaction to severe stress, unspecified
ICD-10-CM · CMS code reference
Use F43.9 when a reaction to severe stress is documented without a kind, including trauma and stressor-related disorder NOS (not otherwise specified). If a kind is documented, use its code, such as F43.0, F43.10, F43.20 or F43.81.
Coding notes
From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.
Also covers
- Trauma and stressor-related disorder, NOS
- Unspecified trauma and stressor-related disorder
Related codes
F43.21Adjustment disorder with depressed mood ICD-10-CMF43.22Adjustment disorder with anxiety ICD-10-CMF43.23Adjustment disorder with mixed anxiety and depressed mood ICD-10-CMF43.24Adjustment disorder with disturbance of conduct ICD-10-CMF43.25Adjustment disorder with mixed disturbance of emotions and conduct ICD-10-CMF43.29Adjustment disorder with other symptoms ICD-10-CMF43.81Prolonged grief disorder ICD-10-CMF43.89Other reactions to severe stress ICD-10-CM
Common questions
Is F43.9 a billable code?
Yes. F43.9 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.