The ICD-10-CM code for anxiety with no type documented is F41.9, Anxiety disorder, unspecified. Generalized anxiety disorder is F41.1, panic disorder is F41.0, and phobias and agoraphobia are coded in category F40.
Anxiety codes are short, but the official titles often differ from the names clinicians use. DSM-5-TR social anxiety disorder is coded F40.10, whose ICD-10-CM title is Social phobia, unspecified. Agoraphobia splits by whether panic disorder is present. And anxiety caused by a medical condition or a substance is coded outside F41 altogether.
This guide covers the F40 and F41 codes, the anxiety codes that sit elsewhere in Chapter 5, how to code anxiety alongside depression, and what payers look for on therapy claims. For the full behavioral health code set, see our mental health ICD-10 codes guide.
Key Takeaways
- F41.9 is for anxiety with no type stated. Use F41.1 once the clinician diagnoses generalized anxiety disorder.
- Agoraphobia is F40.01 with panic disorder and F40.02 without it; F40.00 is agoraphobia, unspecified.
- Anxiety due to a medical condition is F06.4, with the condition coded first.
- Substance-induced anxiety uses a combination code in F10 to F19, such as F10.180.
- Code every anxiety disorder the clinician documents and treats; one patient can have more than one.
F41: Other Anxiety Disorders
| Code | ICD-10-CM title | Use when the clinician documents |
|---|---|---|
| F41.0 | Panic disorder [episodic paroxysmal anxiety] | Panic disorder without agoraphobia |
| F41.1 | Generalized anxiety disorder | GAD |
| F41.3 | Other mixed anxiety disorders | A mixed anxiety disorder that is specified |
| F41.8 | Other specified anxiety disorders | Other specified anxiety disorder, including mixed anxiety and depressive disorder as indexed |
| F41.9 | Anxiety disorder, unspecified | Anxiety or anxiety disorder with no type |
F40: Phobic Anxiety Disorders
| Code | ICD-10-CM title | DSM-5-TR term it usually maps to |
|---|---|---|
| F40.00 | Agoraphobia, unspecified | Agoraphobia, panic status not documented |
| F40.01 | Agoraphobia with panic disorder | Agoraphobia plus panic disorder |
| F40.02 | Agoraphobia without panic disorder | Agoraphobia alone |
| F40.10 | Social phobia, unspecified | Social anxiety disorder |
| F40.11 | Social phobia, generalized | Generalized social anxiety |
| F40.2- | Specific (isolated) phobias | Specific phobia: animal, natural environment, blood-injection-injury, situational and other types |
| F40.8 | Other phobic anxiety disorders | A specified phobic disorder not listed |
| F40.9 | Phobic anxiety disorder, unspecified | Phobia with no type |
Specific phobia needs the type. F40.2 is a subcategory. Blood-injection-injury phobias, for example, are F40.230 to F40.233 depending on whether the fear is of blood, needles, injury or other medical care.
Anxiety Codes Outside F40 and F41
| Situation | Code | Sequencing |
|---|---|---|
| Anxiety caused by a medical condition, such as hyperthyroidism | F06.4 | Code the medical condition first |
| Alcohol-induced anxiety with alcohol abuse | F10.180 | One combination code; use F10.280 with dependence |
| Anxiety as a reaction to a stressor | F43.22 | Adjustment disorder with anxiety |
| Separation anxiety in a child | F93.0 | Separation anxiety disorder of childhood |
| Screening with a tool such as the GAD-7 | Z13.39 | Screening encounter; add an F code only if a disorder is diagnosed |
When poor concentration is the main complaint and no anxiety disorder is diagnosed, a cognitive symptom code may fit better; see our brain fog ICD-10 code guide.
Coding Anxiety With Depression
- Two diagnoses documented. If the clinician diagnoses GAD and major depressive disorder, code both, such as F41.1 and F33.1, with the one chiefly treated first.
- Mixed anxiety and depressive disorder. When the clinician uses that diagnosis, follow the Alphabetic Index, which leads to F41.8. Do not split it into two codes.
- Reaction to a stressor. Anxious and depressed mood tied to a recent stressor is often adjustment disorder with mixed anxiety and depressed mood, F43.23.
Do not stop at F41.9 by habit. Many payers accept F41.9, but when the record supports GAD or panic disorder, the unspecified code understates the condition and can weaken medical necessity for ongoing therapy.
What Payers Look For on Anxiety Claims
- A diagnosis made by the treating clinician, not only a screening score
- Symptoms and how they affect work, school or relationships
- Duration where the diagnosis depends on it, such as GAD
- Any medical or substance cause the clinician identified
- A treatment plan that matches the diagnosis and the session codes billed
For session codes and claim steps, see our guide on how to bill for mental health therapy. Practices that want coding handled end to end can see our psychology billing services.
Worked Example
Scenario. A therapist sees an adult with recurrent panic attacks who now avoids crowded stores and public transport. The clinician diagnoses panic disorder with agoraphobia. Code: F40.01, Agoraphobia with panic disorder. F41.0 is not added, because F40.01 already captures the panic disorder.
Behavioral health claims getting denied for diagnosis issues? Request a free revenue cycle audit and we will review your anxiety and mood coding against the documentation.
Frequently Asked Questions
What is the ICD-10 code for anxiety?
F41.9, Anxiety disorder, unspecified, is used when no type is documented. Generalized anxiety disorder is F41.1 and panic disorder is F41.0.
What is the ICD-10 code for social anxiety disorder?
F40.10, whose ICD-10-CM title is Social phobia, unspecified. F40.11 is Social phobia, generalized.
How is agoraphobia coded?
F40.01 with panic disorder, F40.02 without panic disorder and F40.00 when panic status is not documented.
Can I code more than one anxiety disorder?
Yes. Code each anxiety disorder the clinician documents, unless one code already includes the other, as F40.01 includes panic disorder.
How do I code anxiety caused by a medical condition?
Code the medical condition first, then F06.4, Anxiety disorder due to known physiological condition.
