ICD-10 Code F43.89 – Other reactions to severe stress (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F43.89 – Other reactions to severe stress
What it is
F43.89 identifies stress-related reactions that do not fit a more specific ICD-10 diagnosis. Use it when the record clearly links symptoms to severe stress, but the exact disorder is not otherwise specified.
Clinical signs
Clinical features vary; refer to documentation. Records may note emotional distress, anxiety, behavioral change, or impaired functioning after a major stressor, without enough detail for a more specific adjustment or trauma-related code.
When to use this code
Use this code when the clinician documents an other specified reaction to severe stress and does not name a more precise condition. It may apply when the presentation is stress-related but atypical or incompletely described. Check documentation for the triggering event and the provider’s final diagnosis.
Do not use for
Do not use F43.89 when the chart supports a more specific stress-related diagnosis, such as adjustment disorder or post-traumatic stress disorder. Do not assign it for general anxiety, depression, or nonspecific stress without provider linkage.
Coding tip
Code F43.89 only after confirming the provider’s wording and excluding a more specific F43 diagnosis.