F91.9Billable

Conduct disorder, unspecified

Chapter
5. Mental, Behavioral and Neurodevelopmental disorders
Category
F91
Effective date
October 1, 2026

Related codes in category F91

F91Conduct disordersF91.0Conduct disorder confined to family contextYesF91.1Conduct disorder, childhood-onset typeYesF91.2Conduct disorder, adolescent-onset typeYesF91.3Oppositional defiant disorderYesF91.8Other conduct disordersYes

Frequently asked questions

What is ICD-10 code F91.9?

F91.9 is an ICD-10-CM diagnosis code for Conduct disorder, unspecified.

Is F91.9 a billable code?

Yes. F91.9 is billable and specific enough to be used on a claim.

What ICD-10-CM chapter is F91.9 in?

F91.9 falls under Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

When did F91.9 become effective?

F91.9 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to F91.9?

F91.9 belongs to category F91, which includes 6 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.