ICD-10 Code F40.22 – Natural environment type phobia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F40.22 – Natural environment type phobia
What it is
F40.22 identifies a specific phobia centered on natural environmental situations, such as storms, heights, water, or other nature-related triggers. You use it when the fear is marked, persistent, and out of proportion to the actual risk.
Clinical signs
Patients may show intense anxiety, panic, or avoidance when exposed to the feared natural setting. Clinical features vary; refer to documentation for the exact trigger and level of impairment.
When to use this code
Use F40.22 when the record clearly documents a natural environment type phobia as the primary anxiety diagnosis. It fits outpatient, emergency, or behavioral health notes that describe fear-driven avoidance of storms, heights, water, or similar triggers. Code based on the documented phobic stimulus, not a general anxiety complaint.
Do not use for
Do not use this code for ordinary dislike, situational nervousness, or fear explained by another mental disorder. If the documentation does not specify a natural environment phobia, check documentation before coding.
Coding tip
Verify the exact feared natural trigger in the note, because the diagnosis depends on documented phobic stimulus.