ICD-10-CM code F40.9 describes phobic anxiety disorder, unspecified. Phobia where the type is not specified. It is a billable, specific code valid for claim submission. It is grouped under the “Anxiety, Trauma & Stress-Related Disorders” section of the mental, behavioral, and neurodevelopmental disorders chapter.
When to use F40.9
Use this group for phobias, panic, generalized anxiety, OCD, PTSD, acute and adjustment disorders, and dissociative and somatic symptom disorders. Match the code to the specific syndrome and document the precipitating trigger where relevant. For F40.9 specifically, phobia where the type is not specified.
Documentation & billing
Document the specific syndrome, severity or frequency, and for trauma- or stress-related codes the precipitating event. For somatic symptom and pain disorders, note the psychological factors involved.
Common pitfalls
- Using unspecified anxiety (F41.9) when criteria for a specific disorder are met.
- Coding PTSD under a generic anxiety or stress code.
- Failing to specify the phobia type (animal, situational, or blood-injection-injury).
Common search terms for F40.9
Clinicians often look up F40.9 using plain-language terms. This code maps to:
Frequently asked questions
What is ICD-10-CM code F40.9?
Phobic anxiety disorder, unspecified. Phobia where the type is not specified.
Is F40.9 a billable ICD-10-CM code?
Yes. F40.9 (Phobic anxiety disorder, unspecified) is a billable, specific ICD-10-CM code that can be reported on a claim. Confirm the current official descriptor against the CDC code set and your payer’s policies before submitting.
What should I document to support F40.9?
Document the specific syndrome, severity or frequency, and for trauma- or stress-related codes the precipitating event. For somatic symptom and pain disorders, note the psychological factors involved.