Is F40 a billable ICD-10-CM code?

No. F40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does F40 sit in the tabular list?

Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders (F40-F48).

F40

F40 — Phobic anxiety disorders

Non-billable headerICD-10-CM

F40 is a non-billable header ICD-10-CM code for phobic anxiety disorders. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with F40

These codes carry an Excludes1 note pointing at F40. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading F40 alone.

F41.0Panic disorder [episodic paroxysmal anxiety]

Risk adjustment

F40 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead F40

5 child codes. Green means billable.

Questions about F40

Is F40 a billable ICD-10-CM code?: No. F40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does F40 sit in the tabular list?: Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders (F40-F48).