F43 – Reaction to severe stress, and adjustment disorders
ICD-10-CM 2027 diagnosis code · Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders
ICD-10-CM code
F43
- Code
F43(claims format:F43)- Description
- Reaction to severe stress, and adjustment disorders
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 5. Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
- Block
- F40-F48 Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders
Billable codes under F43
F43 is a header code and cannot be used on claims. Choose the most specific code:
- F43.0 – Acute stress reactionBillable
- F43.1 – Post-traumatic stress disorder (PTSD)Header (more codes below)
- F43.2 – Adjustment disordersHeader (more codes below)
- F43.8 – Other reactions to severe stressHeader (more codes below)
- F43.9 – Reaction to severe stress, unspecifiedBillable
Frequently asked questions
What is ICD-10 code F43?
F43 is the ICD-10-CM code for reaction to severe stress, and adjustment disorders, in the block F40-F48 (Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders).
Is F43 a billable code?
No. F43 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.