F43.9

✓ Billable

Reaction to severe stress, unspecified

Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

Also Known As

Trauma and stressor-related disorder, NOSUnspecified trauma and stressor-related disorder

✅ No additional coding notes for F43.9

🧪 Validate Combinations

Add F43.9 to the Excludes Checker to validate against your full code list.

Code Information

CodeF43.9

BillableYes

ParentF43

CategoryMental, Behavioral and Neurodevelopmental disorders (F01-F99)

Excludes10 rule(s)

Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)