F41.9: Anxiety disorder, unspecified
Billable ICD-10-CM code, FY2027
What ICD-10-CM says
Includes
- Anxiety NOS
Notes at F41, Other anxiety disorders (they apply to every code under it)
Excludes2 (not part of F41.9; both may be coded)
- anxiety in:
- acute stress reaction (F43.0)
- transient adjustment reaction (F43.2)
- neurasthenia (F48.8)
- psychophysiologic disorders (F45.-)
- separation anxiety (F93.0)
What F41.9 covers
F41.9 is for an anxiety disorder that the record does not name more specifically. The tabular includes anxiety NOS here. It often appears at a first visit, before the clinician has settled on a specific diagnosis.
Primary care uses it heavily, as do behavioral health practices early in care. The more specific siblings are F41.1 (generalized anxiety disorder), F41.0 (panic disorder), F41.3 (other mixed anxiety disorders) and F41.8 (other specified anxiety disorders). Phobic anxiety disorders sit in a different category, F40.-.
Billing and coding notes
F41.9 is billable, but it is an unspecified code. The guidelines accept unspecified codes when the documentation does not support more detail. Once the clinician records a specific diagnosis, later claims should use that code instead.
The F41 excludes2 list applies here too: acute stress reaction (F43.0), adjustment reaction (F43.2) and separation anxiety (F93.0) may be coded alongside when documented as separate conditions. Anxiety as a reaction to a stressor is usually an adjustment disorder (F43.22), not F41.9.
Related codes under F41
Questions about F41.9
Is F41.9 billable?
Yes. F41.9 is a complete code. It is unspecified, so use a more specific F41 code when the documentation names the type of anxiety disorder.
What is the difference between F41.9 and F41.1?
F41.9 is anxiety without a named type. F41.1 is generalized anxiety disorder, a specific diagnosis. If the clinician writes GAD, code F41.1.
ICD-10-CM in CloudMedico
In CloudMedico, a visit's diagnoses come from the current ICD-10-CM list. For US practices, the visit flags a code that isn't billable on its date, and a superbill made from an invoice carries the visit's diagnoses.
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