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    OpenPayerBilling CodesAnxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disordersICD-10-CM f43-reaction-to-severe-stress
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    ICD-10-CM Code For Reaction To Severe Stress And Adjustment Disorders: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group F43 includes diagnoses such as acute stress disorder, posttraumatic stress disorder, and adjustment disorders representing maladaptive psychological responses to identifiable stressors or traumatic events. These ICD-10-CM diagnosis codes are used to document the presence and clinical characteristics of stress-related mental disorders, capturing severity, symptom presentation, and any associated behavioral or functional impairment. Accurate coding within the ICD-10-CM F43 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM F43: Reaction to severe stress, and adjustment disorders Overview

    The ICD-10-CM F43 group covers reactions to severe stress and adjustment disorders affecting mental and behavioral functioning. These diagnoses describe psychological responses to identifiable stressors, including acute stress disorder, posttraumatic stress disorder, and various adjustment disorders. Accurate coding matters for reimbursement because it links clinical documentation to appropriate mental health services and supports correct claim processing.

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    When to Use

    Use a code from this group when a clinician documents a mental disorder directly attributable to an identifiable stressor or traumatic event with accompanying symptoms. Select the specific code that reflects the diagnosis (for example, acute stress disorder, posttraumatic stress disorder, or an adjustment disorder) and the documented severity or symptom features.

    ICD-10-CM Codes

    14 rows

    ICD-10-CM CodeDescription
    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
    F43.81Prolonged grief disorder
    F43.89Other reactions to severe stress
    F43.9Reaction to severe stress, unspecified

    DRG Codes

    3 rows

    DRG CodeDescription
    880Acute Adjustment Reaction and Psychosocial Dysfunction
    881Depressive Neuroses
    882Neuroses Except Depressive

    Typical Clinical Scenarios

    • A 28-year-old emergency department patient presents within 48 hours of a witnessed workplace explosion with intense fear, intrusive recollections, marked hypervigilance, and nightmares that impair sleep; symptoms are disproportionate to the event and cause significant distress but have lasted less than one month, prompting urgent evaluation and short-term crisis management. A stress-related trauma reaction code is assigned to capture the acute symptomatic response to a traumatic event. Typical codes: F43.0, F43.10
    • A 45-year-old primary care patient reports persistent sleep disturbance, avoidance of reminders of a past motor vehicle collision two years ago, diminished interest in activities, and intermittent dissociative episodes; symptoms have been present for many months and cause social and occupational impairment, leading the clinician to document a chronic post-traumatic stress disorder or chronic stress-related condition for ongoing management. Typical codes: F43.11, F43.12
    • A 16-year-old adolescent seen in outpatient psychiatry develops depressive mood, anxiety, and school refusal after parental divorce three months earlier; symptoms cause functional decline but do not meet criteria for PTSD, so an adjustment disorder with mixed anxiety and depressed mood or other specified stress-related disorder is used as the working diagnosis while psychosocial interventions are arranged. Typical codes: F43.21, F43.89

    Related Codes

    F40-PHOBIC-ANXIETY-DISORDERS

    ICD-10-CM Code For Phobic Anxiety Disorders: Group Overview

    F41-OTHER-ANXIETY-DISORDERS

    ICD-10-CM Code For Other Anxiety Disorders: Group Overview

    F42-OBSESSIVE-COMPULSIVE-DISORDER

    ICD-10-CM Code For Obsessive-Compulsive Disorder: Group Overview

    F44-DISSOCIATIVE-AND-CONVERSION-DISORDERS

    ICD-10-CM Code For Dissociative And Conversion Disorders: Group Overview

    F45-SOMATOFORM-DISORDERS

    ICD-10-CM Code For Somatoform Disorders: Group Overview

    F48-OTHER-NONPSYCHOTIC-MENTAL-DISORDERS

    ICD-10-CM Code For Other Nonpsychotic Mental Disorders: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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