2026 ICD-10-CM Diagnosis Code F43.8
Other reactions to severe stress
About F43.8
Code
F43.8
Description
Other reactions to severe stress
Billable
Yes — billable on its own
Parent code
F43 (Reaction to severe stress, and adjustment disorders)
Category
F40-F49 — Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders
Set
ICD-10-CM 2026
Clinical context
Inherited from F43 (Reaction to severe stress, and adjustment disorders)
F43 covers conditions that arise as a direct response to an identifiable stressor — including acute stress reaction (F43.0), post-traumatic stress disorder (F43.10/F43.11/F43.12), and adjustment disorders (F43.20–F43.29). PTSD is one of the most billed F-codes in trauma-focused practice.
Code details
Code attributes
- Non-billable/Non-specific code
Coding rules
- Document the stressor — F43 codes require an identifiable precipitating stressor. Document the event, its proximity to symptom onset, and the patient's appraisal.
- PTSD subtype matters — F43.10 (unspecified), F43.11 (acute), F43.12 (chronic) — chronicity changes the code.
- Adjustment disorder is specific — F43.21 (depressed mood), F43.22 (anxiety), F43.23 (mixed) — match the predominant clinical feature.
Codes
15 codes in F43- F43.0Acute stress reaction
- F43.10Post-traumatic stress disorder, unspecified
- F43.11Post-traumatic stress disorder, acute
- F43.12Post-traumatic stress disorder, chronic
- F43.20Adjustment disorder, unspecified
- F43.21Adjustment disorder with depressed mood
- F43.22Adjustment disorder with anxiety
- F43.23Adjustment disorder with mixed anxiety and depressed mood
- F43.24Adjustment disorder with disturbance of conduct
- F43.25Adjustment disorder with mixed disturbance of emotions and conduct
- F43.29Adjustment disorder with other symptoms
- F43.8Other reactions to severe stressYou're here
- F43.81Prolonged grief disorder
- F43.89Other reactions to severe stress
- F43.9Reaction to severe stress, unspecified
Sources
- Centers for Medicare & Medicaid Services — 2026 ICD-10-CM
- AAPC — ICD-10-CM Code Lookup
- CDC — ICD-10-CM Official Guidelines for Coding and Reporting
This reference is provided for billing and documentation guidance only. It is not medical advice. For clinical decision-making, consult the current CMS ICD-10-CM Official Guidelines for Coding and Reporting, and verify code applicability against the patient's documented clinical findings.
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