Is ICD-10-CM code F40 billable?

No, F40 (Phobic anxiety disorders) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code F40 belong to?

F40 belongs to Chapter 5 of the ICD-10-CM tabular list: F01–F99 (Mental, Behavioral and Neurodevelopmental Disorders).

F40Non-billable

Phobic anxiety disorders

Mental, Behavioral and Neurodevelopmental Disorders·Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders (F40-F48)·category·FY 2026

Use a more specific code (2 billable, 3 non-billable)

F40.0Agoraphobiahas subcodes F40.1Social phobiashas subcodes F40.2Specific (isolated) phobiashas subcodes F40.8Other phobic anxiety disorders F40.9Phobic anxiety disorder, unspecified

CH5 Parent Instructions

Includes

disorders of psychological development

Excludes2(Not included here. Code separately if applicable.)

symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Clinical Hierarchy

BillableHas subcodes

CH5Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

F40-F48Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders (F40-F48)

F40Phobic anxiety disordersNot billable

F40.0AgoraphobiaSubcodes

F40.1Social phobiasSubcodes

F40.2Specific (isolated) phobiasSubcodes

F40.8Other phobic anxiety disordersBillable

F40.9Phobic anxiety disorder, unspecifiedBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.