ICD-10-CM 2027
ICD-10 code for conduct disturbance
From the official ICD-10-CM alphabetic index entry “Disturbance (s) › conduct”. Page updated September 29, 2026.
About coding conduct disturbance
The ICD-10-CM code for conduct disturbance is F91.9 (Conduct disorder, unspecified). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on F91.9.
Within F91, choose F91.9 (Conduct disorder, unspecified) only when documentation doesn't support a more specific option: conduct disorder confined to family context (F91.0), conduct disorder, childhood-onset type (F91.1), conduct disorder, adolescent-onset type (F91.2), Oppositional defiant disorder (F91.3) and other conduct disorders (F91.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 886 (Behavioral and Developmental Disorders, relative weight 1.8678), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific conduct disturbance codes (official index)
Common questions about conduct disturbance ICD-10 codes
What is the ICD-10 code for conduct disturbance?
- F91.9 — Conduct disorder, unspecified. More specific codes apply when the documentation supports them: F63.9, F91.9, F91.2, F91.8 and others below.
What is the ICD-10 code for compulsive conduct disturbance?
- F63.9 — Impulse disorder, unspecified.
What is the ICD-10 code for disruptive conduct disturbance?
- F91.9 — Conduct disorder, unspecified.
What is the ICD-10 code for socialized conduct disturbance?
- F91.2 — Conduct disorder, adolescent-onset type.
What is the ICD-10 code for unsocialized conduct disturbance?
- F91.1 — Conduct disorder, childhood-onset type.
Is F91.9 billable?
- Yes. F91.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F91.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F91.9 as a principal diagnosis.
Is F91.9 a CC or MCC?
- No. F91.9 is neither a CC nor an MCC under MS-DRG v44.0.