ICD-10-CM Code for Agoraphobia: A Clinical Guide for Mental Health Professionals

Agoraphobia occupies a unique position in the ICD-10 classification system. Unlike in the DSM-5, where agoraphobia is a standalone diagnosis distinct from panic disorder, the ICD-10-CM framework treats agoraphobia as a specific subset of phobic anxiety disorders. The distinction between "with panic disorder" and "without panic disorder" is not a footnote—it is the central coding decision that determines accuracy in billing, treatment planning, and clinical communication.

This article examines the ICD-10-CM coding structure for agoraphobia, the clinical distinctions that drive code selection, the documentation requirements that protect against audit risk, and the differential diagnosis considerations that prevent misclassification.

The Code Structure – F40.0 and Its Subcategories

The ICD-10-CM parent code F40.0 (Agoraphobia) is non-billable, meaning it should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail. The 2026 edition of ICD-10-CM F40.0 became effective on October 1, 2025.

The Three Billable Subcodes

F40.01 includes "panic disorder with agoraphobia" and is a billable code. F40.02 is the code for agoraphobia when panic disorder has been explicitly ruled out.

The ICD-9 to ICD-10 Crosswalk

In ICD-9, 300.2 (Phobic disorders) crosswalked to F40 (Phobic anxiety disorders) in ICD-10. The ICD-9 codes 300.21 (Agoraphobia with panic disorder) and 300.22 (Agoraphobia without panic attacks) were split in ICD-10, with 300.22 now mapping to either F40.00 or F40.02 depending on whether the clinician has documented the presence or absence of panic disorder. As one coding expert notes, F40.02 means you know that agoraphobia does not include panic disorder, whereas F40.00 means you do not know whether it includes panic disorder or not.

The ICD-11 Equivalent

In ICD-11, agoraphobia has its own code: 6B02 - Agoraphobia. While the transition to ICD-11 is not yet complete in the U.S., clinicians should be aware that the classification is evolving and that the standalone nature of agoraphobia in ICD-11 aligns more closely with the DSM-5 approach.

The Clinical Definition – What Agoraphobia Actually Is

ICD-10 defines agoraphobia as "an anxiety disorder characterized by an intense, irrational fear of venturing out into open places or situations in which help (or escape) might not be available should excessive anxiety or panic symptoms develop".

The definition is more specific in the ICD-10 tabular list: "A fairly well-defined group of phobias embracing fears of leaving home, entering shops, crowds and public places, or travelling alone in trains, buses or planes".

Core Clinical Features

The ICD-10 framework for agoraphobia includes several key features:

• Excessive fear of being alone, or being in public places or situations (e.g., in crowds or elevators) from which there is no easy escape or where help cannot be obtained in the event of an incapacitating reaction or panic

• Intense, irrational fear of open spaces, characterized by marked fear of being alone or of being in public places where escape would be difficult or help might not be available

• Avoidance behaviour that may, in severe cases, render the individual unable to leave their home or "safe havens"

The DSM-5 Distinction

Unlike ICD-10, the DSM-5 classifies agoraphobia as separate from panic disorder. In ICD-10, agoraphobia and panic disorder remain separate categories (F40.0 and F41.0), but the codes allow for the specification of whether panic attacks co-occur. This distinction is important for clinicians who work across diagnostic systems and need to reconcile documentation from different sources.

The Documentation Decision – F40.00 vs. F40.01 vs. F40.02

The choice between F40.00, F40.01, and F40.02 hinges on a single clinical determination: is panic disorder present, absent, or unknown?

F40.01 – Agoraphobia with Panic Disorder

Use F40.01 when the clinical record documents both:

• Agoraphobia (fear of situations from which escape might be difficult or help unavailable)

• Panic disorder (recurrent, unexpected panic attacks with persistent concern about additional attacks)

The presence of panic attacks is the key to accurate reporting. If the clinician notes panic attacks as part of the agoraphobic presentation, F40.01 is the appropriate code.

F40.02 – Agoraphobia without Panic Disorder

Use F40.02 when the clinician has explicitly documented that agoraphobia is present but panic disorder is absent. This requires clear documentation that the patient's avoidance behaviour is not driven by panic attacks.

F40.00 – Agoraphobia, Unspecified

Use F40.00 when the clinical record documents agoraphobia but does not specify whether panic disorder is present or absent. This code serves as a "bail out" when the clinician has not documented the presence or absence of panic attacks. However, prior to opting for F40.00, it is best to check with the clinician about the occurrence of panic attacks.

Documentation Requirements for Each Code

Part 4: Differential Diagnosis – What Agoraphobia Is Not

Agoraphobia is frequently confused with other anxiety disorders, particularly social phobia and specific phobias. Understanding the boundaries is essential for accurate coding.

Agoraphobia vs. Social Phobia (F40.1)

Agoraphobia is not considered a social phobia in ICD-10. Social phobias (F40.1) involve fear of social situations and scrutiny by others—conditions such as anthropophobia, social anxiety disorder, and social anxiety disorder of childhood. Agoraphobia, by contrast, involves fear of being in situations from which escape might be difficult or help unavailable, regardless of social scrutiny.

Agoraphobia vs. Specific Phobias (F40.2)

Specific phobias are fears of particular objects or situations—animals, heights, blood, injections, etc. Agoraphobia is broader, involving a cluster of situations (crowds, public transport, open spaces) that share the common feature of perceived inescapability.

Agoraphobia vs. Panic Disorder without Agoraphobia (F41.0)

When panic disorder is present without any symptoms of agoraphobia, the correct code is F41.0, not F40.01. If the patient experiences panic attacks but does not avoid situations where escape might be difficult, the diagnosis is panic disorder without agoraphobia.

Agoraphobia vs. Generalized Anxiety Disorder (F41.1)

GAD involves pervasive worry across multiple domains that is not limited to situations of potential inescapability. The fear in agoraphobia is situation-specific; the worry in GAD is generalized.

Part 5: Clinical Presentation and Symptom Documentation

To support accurate coding and medical necessity, documentation should include specific descriptions of the feared situations and the patient's response.

Feared Situations to Document

According to ICD-10 criteria, clinicians should document fear or avoidance of at least two of the following situations:

• Using public transportation (buses, trains, planes, subways)

• Being in open spaces (parking lots, marketplaces, bridges)

• Being in enclosed spaces (shops, theatres, cinemas, elevators)

• Standing in line or being in a crowd

• Being outside of the home alone

Symptoms to Document

The following symptoms support the diagnosis and justify treatment:

• Cognitive: Fear of losing control, fear of dying, fear of going crazy, catastrophic thinking about being unable to escape or get help

• Physical: Palpitations, sweating, trembling, shortness of breath, choking sensation, chest pain, nausea, dizziness, derealization or depersonalization

• Behavioural: Avoidance of feared situations, requiring a companion to leave home, progressive restriction of activities

• Functional impairment: Inability to work, social isolation, dependence on others for transportation or errands

Sample Documentation

“Patient presents with a 14-month history of fear of public places and situations from which escape might be difficult. She reports that she can no longer use public transportation without experiencing intense anxiety (palpitations, sweating, shortness of breath) and has stopped entering shopping centres. She now requires her husband to accompany her on all outings and has reduced her social engagements. She reports that she does not experience panic attacks—her anxiety is anticipatory and situational. She is able to leave the house alone for short walks but avoids crowds. Diagnosis: F40.02 Agoraphobia without panic disorder.”

Part 6: Common Coding Pitfalls and Audit Protection

Pitfall 1: Using F40.0 Instead of a Subcode

F40.0 is non-billable and should never be used for reimbursement. The correct code is always F40.00, F40.01, or F40.02.

Pitfall 2: Using F40.00 When Panic Status Is Known

If the clinician has documented the presence or absence of panic disorder, F40.00 is not appropriate. Use F40.01 or F40.02 instead.

Pitfall 3: Confusing Panic Attacks with Anticipatory Anxiety

Not all anxiety in agoraphobia is a panic attack. Anticipatory anxiety—the fear of having a panic attack—is different from the panic attack itself. The documentation must be clear about which is present.

Pitfall 4: Failing to Document the Specific Feared Situations

Auditors expect specificity. “Agoraphobia” without a description of feared situations may trigger additional scrutiny. Document the specific situations the patient avoids.

Pitfall 5: Using F40.01 When Panic Disorder Is Not Documented

If the documentation does not mention panic attacks or panic disorder, F40.01 is not supported. In such cases, F40.00 (unspecified) is the appropriate code.

Audit Checklist for Agoraphobia Documentation

• Diagnosis of agoraphobia clearly stated

• Specific feared situations documented (e.g., public transport, crowds, open spaces)

• Presence or absence of panic disorder clearly documented

• Symptoms described (cognitive, physical, behavioural)

• Functional impairment documented

• Duration of symptoms (≥6 months) stated

• Rule-out of other conditions (social phobia, specific phobias, GAD) noted

FAQ

What is the ICD-10 code for agoraphobia with panic disorder?

F40.01 is the correct code for agoraphobia with panic disorder. It is a billable code that includes “panic disorder with agoraphobia”.

What is the difference between F40.00 and F40.02?

F40.02 (Agoraphobia without panic disorder) is used when the clinician has explicitly documented that panic disorder is absent. F40.00 (Agoraphobia, unspecified) is used when the documentation does not specify whether panic disorder is present or absent. F40.00 is a “bail out” code when the panic status is unknown.

Can I use F40.01 if the patient has panic attacks but no panic disorder diagnosis?

Yes, provided the documentation supports the presence of panic attacks. F40.01 does not require a separate panic disorder diagnosis—it requires documented panic attacks as part of the agoraphobic presentation.

Is agoraphobia considered a social phobia in ICD-10?

No. Agoraphobia is part of the F40.- (Phobic anxiety disorders) code set but is not considered a social phobia. Social phobias are coded under F40.1 and include conditions such as social anxiety disorder.

What documentation is required to support a diagnosis of agoraphobia?

Documentation should include: (1) specific feared situations (e.g., public transport, crowds, open spaces), (2) symptoms (cognitive, physical, behavioural), (3) duration of symptoms (≥6 months), (4) functional impairment, (5) presence or absence of panic disorder, and (6) rule-out of other conditions.

References

1. ICD-10 Data. (2026). 2026 ICD-10-CM Diagnosis Code F40.0 – Agoraphobia.

2. ICD-10 Data. (2026). 2026 ICD-10-CM Diagnosis Code F40.02 – Agoraphobia without panic disorder.

3. Emedcodes. (2026). ICD-10-CM Code F40.0 – Agoraphobia.

4. AAPC. (2023). Look to Code Trio for Agoraphobia Dx: Reader Questions.

5. AAPC. (2013). F40 Takes the Anxiety Out of Your Agoraphobia Reporting: ICD-10 Update.

6. Unbound Medicine. (2026). F40.01 – Agoraphobia with panic disorder.