Reaction to severe stress, and adjustment disorders (F43) ICD-10-CM
The F43 code range covers reaction to severe stress, and adjustment disorders with 18 ICD-10-CM diagnosis codes. 14 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the F43 Range 18 codes · 14 billable
- F43 Reaction to severe stress, and adjustment disordersNon-billable
- F43.0 Acute stress reaction
- F43.1 Post-traumatic stress disorder (PTSD)Non-billable
- F43.10 Post-traumatic stress disorder, unspecified
- F43.11 Post-traumatic stress disorder, acute
- F43.12 Post-traumatic stress disorder, chronic
- F43.2 Adjustment disordersNon-billable
- F43.20 Adjustment disorder, unspecified
- F43.21 Adjustment disorder with depressed mood
- F43.22 Adjustment disorder with anxiety
- F43.23 Adjustment disorder with mixed anxiety and depressed mood
- F43.24 Adjustment disorder with disturbance of conduct
- F43.25 Adjustment disorder with mixed disturbance of emotions and conduct
- F43.29 Adjustment disorder with other symptoms
- F43.8 Other reactions to severe stressNon-billable
- F43.81 Prolonged grief disorder
- F43.89 Other reactions to severe stress
- F43.9 Reaction to severe stress, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the F43 range.
Adjustment Disorders
Maladaptive reactions to identifiable psychosocial stressors occurring within a short time after onset of the stressor. They are manifested by either impairment in social or occupational functioning or by symptoms (depression, anxiety, etc.) that are in excess of a normal and expected reaction to the stressor.
Prolonged Grief Disorder
Severe and disabling grief reactions that do not remit in the 12 months after the death of a significant other. The core of the diagnosis includes persistent yearning or missing the deceased, and preoccupation with the circumstance of the death. (Carmassi, Clinical Handbook of Bereavement and Grief Reactions, 2018)
Stress Disorders, Post-Traumatic
A class of traumatic stress disorders with symptoms that last more than one month.
About the F43 Code Range
Severe stress reactions, post-traumatic stress disorder (PTSD), prolonged grief, and adjustment disorders appear together in F43.
The subdivisions separate acute stress reaction (F43.0) from PTSD (F43.1), which splits into unspecified, acute, and chronic forms. Adjustment disorders (F43.2) split by symptoms involving mood, anxiety, conduct, or combinations of these. Other reactions to severe stress (F43.8) include prolonged grief disorder. F43.9 identifies an unspecified reaction to severe stress.
Questions About This Page
How many billable codes are in the F43 range?
Of the 18 codes in this range, 14 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the F43 range classify?
The range classifies reaction to severe stress, and adjustment disorders. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
