F40.0 is a "category code," which means it's non-billable. Billable codes require more specificity. Use the list below to navigate to codes that are more specific:
10
F40.00
Agoraphobia, unspecified
Billable
10
F40.01
Agoraphobia with panic disorder
Billable
10
F40.02
Agoraphobia without panic disorder
Billable