F91.9 Conduct disorder, unspecified

The ICD-10-CM code for Conduct disorder, unspecified is F91.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

F90-F98: Behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F90-F98)

Category F91

7 codes (6 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to F91.9:

• Disorder (of) › disruptive
• Disorder (of) › conduct (childhood)
• Disturbance (s) › conduct
• Disturbance (s) › conduct › disruptive

Inclusion Terms

• Behavioral disorder NOS
• Conduct disorder NOS
• Disruptive behavior disorder NOS
• Disruptive disorder NOS

U.S. Hospital Utilization

• An estimated 18,915 U.S. inpatient stays in 2023 included F91.9 among the documented diagnoses.
• 1,760 stays listed it as the principal diagnosis.

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)