2027 ICD-10-CM Diagnosis Code F91.8Other conduct disorders
ICD-10-CM Codes›F01–F99›F90-F98›F91
- Billable — Valid for Submission
- Not Chronic
F91.8 is a billable ICD-10-CM diagnosis code for other conduct disorders. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 886. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Disruptive, impulse-control and conduct disorders.
F91.8 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
F91.8 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abnormal sexual behavior
- Abusive behavior towards animals
- Aggression caused by alcohol
- Aggressive behavior
- Aggressive outburst
- Aimless destructive behavior
- Banging own head against object
- Banging own head against own body parts
- Behavioral problems at school
- Bullying
- Butting
- Combativeness
- Conduct disorder - unsocialized
- Conduct disorder, undifferentiated type
- Cruel behavior
- Cruelty towards animals
- Cruelty towards people
- Defensive aggression
- Depressive conduct disorder
- Destructive behavior
- Destructive behavior toward property
- Displays of aggression
- Dominance aggression
- Fear-related aggression
- Graffiti writing
- Head-banging
- Head-butting other person
- Intermittent explosive outburst
- Isolated explosive outburst
- Neurotic delinquency
- Offensive aggression
- Play aggression
- Primitive rage
- Running away
- Running away from home
- Running away from school
- Sexual offending behavior
- Shoplifting
- Stealing at school
- Stealing from classmates
- Stealing from home
- Stealing from parents
- Stealing from siblings
- Stealing from work
- Temper problem
- Temper tantrum
- Territorial aggression
- Theft
- Vandalism
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to F91.8: its own notes plus those printed at F91, block F90-F98, and Chapter 5. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- disorders of psychological development
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Other specified conduct disorder
- Other specified disruptive disorder
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Notes
General instructions on how these codes are used.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name F91.8, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming F91.8: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 1
These codes carry an Excludes2 note naming F91.8: its condition is not part of those codes, and both may be reported when the patient has both.
Notes 1
These notes mention F91.8.
- Block F90-F98 Behavioral and emotional disorders with onset usually occurring in childhood and adolescence
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disorder (of) See Also: Disease;
depressive F91.8
specified NEC F91.8
specified NEC F91.8
Disturbance (s) See Also: Disease;
conduct See Also: Disorder, conduct; F91.9
specified NEC F91.8
child problem F91.8
Tantrum, child problem F91.8
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Conduct Disorder
a repetitive and persistent pattern of behavior in which the basic rights of others or major age-appropriate societal norms or rules are violated. these behaviors include aggressive conduct that causes or threatens physical harm to other people or animals, nonaggressive conduct that causes property loss or damage, deceitfulness or theft, and serious violations of rules. the onset is before age 18. (from dsm-iv, 1994)
Patient EducationClinical
Child Behavior Disorders
All kids misbehave some times. And some may have temporary behavior problems due to stress. For example, the birth of a sibling, a divorce, or a death in the family may cause a child to act out. Behavior disorders are more serious. They involve a pattern of hostile, aggressive, or disruptive behaviors for more than 6 months.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert F91.8 to ICD-9-CMHistory
Code HistoryHistory
Questions About F91.8Overview
What is the ICD-10 code for other conduct disorders?
The ICD-10-CM code for other conduct disorders is F91.8 (sometimes written as F918). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is F91.8 (Conduct disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other conduct disorders on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does F91.8 group to?
When other conduct disorders is the principal diagnosis on an inpatient stay, it groups to MS-DRG 886 (behavioral and Developmental Disorders), which carries a relative weight of 1.6455. Higher weights mean higher Medicare reimbursement.
Can F91.8 be reported with a code from Z72.81?
Not as a rule. The Excludes1 note at F91, which applies to F91.8, lists "antisocial behavior (Z72.81-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of F91.8?
Under the General Equivalence Mappings, other conduct disorders converts to ICD-9-CM 312.10 (unsocial unaggress-unsp) and 312.89 (other conduct disorder). The mapping is approximate, so confirm the match fits the documentation.
Does F91.8 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: F91.8 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 (Anxiety and Other Psychiatric Disorders).
