ICD-10 Code F40.21 – Animal type phobia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F40.21 – Animal type phobia
What it is
F40.21 identifies a specific phobia centered on animals. Use it when a patient has a persistent, excessive fear of animals that leads to avoidance or marked distress.
Clinical signs
Typical features include immediate anxiety when exposed to animals, fear out of proportion to the actual danger, and avoidance of places where animals may be present. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly documents animal type phobia, animal phobia, or a specific fear of animals as the primary diagnosis. It may apply in outpatient, emergency, or behavioral health settings when the phobia is the reason for the visit. Check documentation if the fear is part of a broader anxiety disorder.
Do not use for
Do not use this code for normal dislike of animals, brief fear after a bite or attack, or general anxiety without a specific animal trigger. Do not assign it if the chart does not support a true phobia.
Coding tip
Confirm that the provider documents a specific animal-related phobia and not a nonspecific fear or situational anxiety.