F43.9

Reaction to severe stress, unspecified

Billable / specific

F43.9 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

Applicable to

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

Includes (from F43)

  • disorders of psychological development

Excludes2

Not included here — may be reported together when both conditions exist.

  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99) (from F43)

Also known as

  • Trauma and stressor-related disorder, NOS
  • Unspecified trauma and stressor-related disorder
  • Disorder, stress
  • Disorder, trauma and stressor-related NOS
  • Disorder, trauma and stressor-related NOS, unspecified
  • Reaction, stress
  • Stress
  • Stress, reaction

Parent code

  • F43Reaction to severe stress, and adjustment disordersHeader

Related codes

  • F43.0Acute stress reactionBillable
  • F43.1Post-traumatic stress disorder (PTSD)Header
  • F43.2Adjustment disordersHeader
  • F43.8Other reactions to severe stressHeader

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