F43.9

Billable

Reaction to severe stress, unspecified

F43.9 is the ICD-10-CM code for Reaction to severe stress, unspecified. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
F01-F99
Parent
F43
Edition
FY2026

F01-F99 Mental, Behavioral and Neurodevelopmental disorders

Includes

  • Trauma and stressor-related disorder, NOS
  • Unspecified trauma and stressor-related disorder

Frequently asked questions

What is ICD-10 code F43.9?
F43.9 is the ICD-10-CM code for "Reaction to severe stress, unspecified". It falls under F01-F99 Mental, Behavioral and Neurodevelopmental disorders.
Is F43.9 a billable code?
Yes — F43.9 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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