2026 ICD-10-CM Diagnosis Code F91.0Conduct disorder confined to family context

ICD-10-CM Codes›F01–F99›F90-F98›F91

ICD-10-CM F91.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F91.0 is a billable ICD-10-CM diagnosis code for conduct disorder confined to family context. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 886. Coders also document this condition as conduct disorder - in family context. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Disruptive, impulse-control and conduct disorders.

F91.0 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 2026.

Code Identity

ICD-10-CM Code
F91.0
Billable Status
Yes — Valid for Submission
Code Describes
Conduct disorder confined to family context
Short Description
Conduct disorder confined to family context
Same as the full description in the CMS dataset.
Parent Code
F91
Conduct disorders

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF90-F98Behavioral and emotional disorders with onset usually occurring in childhood and adolescence
CategoryF91Conduct disorders
This CodeF91.0Conduct disorder confined to family context

Medicare Risk Adjustment (HCC)Billing

F91.0 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.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 133 — Anxiety and Other Psychiatric Disorders
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2026 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.

  • Conduct disorder - in family context
  • Sibling jealousy

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD008
Disruptive, impulse-control and conduct disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

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 F91.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
312.89 Other conduct disorder
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F91.0Overview

What is the ICD-10 code for conduct disorder confined to family context?

The ICD-10-CM code for conduct disorder confined to family context is F91.0 (sometimes written as F910). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is F91.0 (Conduct disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report conduct disorder confined to family context on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does F91.0 group to?

When conduct disorder confined to family context is the principal diagnosis on an inpatient stay, it groups to MS-DRG 886 (behavioral and Developmental Disorders), which carries a relative weight of 2.0753. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of F91.0?

Under the General Equivalence Mappings, conduct disorder confined to family context converts to ICD-9-CM 312.89 (other conduct disorder). The mapping is approximate, so confirm the match fits the documentation.

Does F91.0 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: F91.0 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).