ICD-10-CM 2027
ICD-10 code for defiant oppositional disorder
From the official ICD-10-CM alphabetic index entry “Disorder (of) › defiant oppositional”. Page updated September 29, 2026.
About coding defiant oppositional disorder
The ICD-10-CM code for defiant oppositional disorder is F91.3 (Oppositional defiant disorder).
Within F91 (conduct disorders), F91.3 is specifically for Oppositional defiant disorder. Related codes cover conduct disorder confined to family context (F91.0), conduct disorder, childhood-onset type (F91.1), conduct disorder, adolescent-onset type (F91.2), other conduct disorders (F91.8) and conduct disorder, unspecified (F91.9).
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.
Common questions about defiant oppositional disorder ICD-10 codes
What is the ICD-10 code for defiant oppositional disorder?
- F91.3 — Oppositional defiant disorder.
Is F91.3 billable?
- Yes. F91.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F91.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F91.3 as a principal diagnosis.
Is F91.3 a CC or MCC?
- No. F91.3 is neither a CC nor an MCC under MS-DRG v44.0.