F06.4 vs F40
F06.4 (Anxiety disorder due to known physiological condition) compared with F40 (Phobic anxiety disorders), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. F06.4 carries an Excludes2 note covering F40: “anxiety disorders, not due to known physiological condition or unspecified (F40.-, F41.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| F06.4Anxiety disorder due to known physiological condition | F40Phobic anxiety disorders | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) |
| Definition | Anxiety disorder due to known physiological condition is a billable ICD-10-CM diagnosis code (F06.4). | Phobic anxiety disorders is a non-billable ICD-10-CM category code (F40). |
| Includes | mental disorders due to endocrine disorder mental disorders due to exogenous hormone mental disorders due to exogenous toxic substance mental disorders due to primary cerebral disease | — |
| Code first | the underlying physiological condition | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources