ICD-10 Code F43.20 – Adjustment disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F43.20 – Adjustment disorder, unspecified
What it is
F43.20 identifies an adjustment disorder when the specific subtype is not documented. It is used for a stress-related emotional or behavioral response that is out of proportion to the stressor and not better specified.
Clinical signs
Typical features include emotional distress, anxiety, depressed mood, or conduct changes after an identifiable stressor. Clinical features vary; refer to documentation.
When to use this code
Use F43.20 when the record documents adjustment disorder but does not specify whether the presentation is with anxiety, depressed mood, mixed disturbance, or another subtype. It may also fit when the clinician notes a stress reaction without further detail. You should code the documented diagnosis, not infer a more specific form.
Do not use for
Do not use this code for a normal stress response, grief without a diagnosed disorder, or a more specific adjustment disorder subtype that is documented elsewhere. Check documentation.
Coding tip
If the note names a specific adjustment disorder presentation, code that subtype instead of F43.20.