F40.9 Phobic anxiety disorder, unspecified

The ICD-10-CM code for Phobic anxiety disorder, unspecified is F40.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

5: Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

Section

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

Category F40

32 codes (23 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to F40.9:

• Fear complex or reaction
• Phobia, phobic
• Phobia, phobic › state
• Reaction › phobic
• Neurosis, neurotic › phobic
• State (of) › phobic
• Reaction › fear
• Phobia, phobic › reaction

Inclusion Terms

• Phobia NOS
• Phobic state NOS

U.S. Hospital Utilization

• An estimated 230 U.S. inpatient stays in 2023 included F40.9 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Pain disorders related to psychological factors (TOC entry)

a. Pain disorders related to psychological factors ..................................................................... 43

Psychoactive substance use disorders (TOC entry)

b. Mental and behavioral disorders due to psychoactive substance use ................................... 43

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference F40.9 with the canonical source and edition:

F40.9 — Phobic anxiety disorder, unspecified. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/F40.9

Canonical URL: https://icd10codingpro.com/codes/F40.9