ICD-10 Code F40.220 – Fear of thunderstorms (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F40.220 – Fear of thunderstorms
What it is
F40.220 identifies a specific phobia involving fear of thunderstorms. Use it when the documented concern is a persistent, excessive fear triggered by storms or thunder.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include marked anxiety, avoidance of storms, and distress that is out of proportion to the actual danger.
When to use this code
Use this code when the record clearly states fear of thunderstorms, thunderstorm phobia, or a specific phobic reaction limited to storms. It is appropriate when the clinician documents functional impact or avoidance behavior related to thunderstorms.
If the note only mentions general anxiety or weather-related discomfort without a specific phobia, check documentation before coding. Code the condition as documented, and confirm that thunderstorms are the identified trigger.
Do not use for
Do not use this code for generalized anxiety, panic disorder, or fear of other weather events unless thunderstorms are specifically documented. Check documentation if the record is vague or uses non-clinical wording.
Coding tip
Look for the exact phobic trigger in the assessment or diagnosis list; if thunderstorms are named, F40.220 is the correct choice.