What is ICD-10 code F91.2?

F91.2 is the ICD-10-CM diagnosis code for Conduct disorder, adolescent-onset type. A behavioral disorder that begins in adolescence (typically age 10 or later) characterized by rule-breaking, aggression, and violation of others' rights. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F91.2 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F91.2 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. F91.2 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. F91.2 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does F91.2 map to under V28?

F91.2 does not map to a CMS-HCC V28 payment category. Check the current CMS-HCC V28 model file for payment year 2026 rather than an older V24 tip sheet.

What does F91.2 pay in RAF?

F91.2 has no separately stated V28 community RAF weight. If it is not a V28 payment HCC, it adds nothing to a community RAF score.

What is the V28 vs V24 difference for F91.2?

F91.2 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither community model rewards F91.2 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's V28/V24 community RAF score in either version. It does, however, map under the Part D RxHCC model (Personality Disorders, Anxiety, and Other Specified Mental Disorders), which affects the ESRD and/or Part D (RxHCC) risk scores. Coders should check whether provider documentation supports a more specific child code that does map to a community payment HCC.

What documentation supports F91.2?

Document onset at or after age 10 to differentiate from childhood-onset conduct disorder Note that adolescent-onset type typically has better prognosis than childhood-onset F91.2 is not a CMS-HCC payment code, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

2026 ICD-10-CM F91.2: Conduct disorder, adolescent-onset

F91.2 is not a CMS-HCC payment code. MEAT criteria · RAF calculator · free HCC coding tools

ICD-10-CM Code View

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Code lookupF91.2Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F90-F98)

F91.2

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Conduct disorder, adolescent-onset type

A behavioral disorder that begins in adolescence (typically age 10 or later) characterized by rule-breaking, aggression, and violation of others' rights.

Buddy Insight

Adolescent-onset conduct disorder is characterized by the absence of conduct disorder symptoms before age 10, with problematic behaviors emerging during adolescence.

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

Mapped

HCC 133

Personality Disorders, Anxiet...

RAF 0.035

Code Book Path

Official

F91Conduct disorders

F91.2Conduct disorder, adolescent-onset type

Inclusion Terms

Official

Socialized conduct disorder
Conduct disorder, group type

Excludes 2

Official

conduct problems associated with attention-deficit hyperactivity disorder (F90.-)
mood [affective] disorders (F30-F39)
pervasive developmental disorders (F84.-)
schizophrenia (F20.-)

Related Child Codes

Official

F91.0Conduct disorder confined to family context

F91.1Conduct disorder, childhood-onset type

F91.3Oppositional defiant disorder

F91.8Other conduct disorders

F91.9Conduct disorder, unspecified

Includes

Official

ICD-10-CM does not list Includes notes for F91.2 in this effective period.

Excludes 1

Official

antisocial behavior (Z72.81-)
antisocial personality disorder (F60.2)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F91.2 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F91.2 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F91.2 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Provider documentation of conduct disorder with no characteristic symptoms before age 10

Evidence of persistent pattern of behavior violating others' rights or societal norms beginning in adolescence

Documentation confirming absence of conduct symptoms in childhood (before age 10)

Assessment of contributing factors (peer influence, substance use, family dynamics)

MEAT Support

HCC Buddy guidance

Provider documentation of conduct disorder with no characteristic symptoms before age 10

Evidence of persistent pattern of behavior violating others' rights or societal norms beginning in adolescence

Documentation confirming absence of conduct symptoms in childhood (before age 10)

Assessment of contributing factors (peer influence, substance use, family dynamics)

Audit Caution

HCC Buddy guidance

Coding adolescent-onset when early childhood behavioral history has not been assessed — verify no symptoms before age 10

Using F91.9 (unspecified) when the age of onset is clearly documented in adolescence

Confusing adolescent-onset conduct disorder with normal adolescent rebellion or peer-influenced behavior

Not reassessing the diagnosis when a detailed childhood history later reveals pre-age-10 symptoms

Common Mistakes

HCC Buddy guidance

F91.1 — Conduct disorder, childhood-onset type; childhood-onset has symptoms before age 10 with worse prognosis

F91.3 — Oppositional defiant disorder; ODD involves less severe defiant behavior without violations of others' rights

Z72.810 — Child and adolescent antisocial behavior; for isolated antisocial acts not meeting conduct disorder criteria

F91.9 — Conduct disorder, unspecified; use F91.2 when adolescent onset is documented

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is F91.2 an HCC code?

F91.2 is not in the CMS-HCC V28 or V24 community payment model, but it does map to Personality Disorders, Anxiety, and Other Specified Mental Disorders under the Part D RxHCC model.

Code: F91.2
Description: Conduct disorder, adolescent-onset type
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

RxHCCHCC 133, Personality Disorders, Anxiety, and Other Specified Mental Disorders

0.035

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work F91.2 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F91.2

For F91.2 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed F91.2 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F91.2 is the ICD-10-CM diagnosis code for conduct disorder, adolescent-onset type. A behavioral disorder that begins in adolescence (typically age 10 or later) characterized by rule-breaking, aggression, and violation of others' rights. F91.2 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering behavioral and emotional disorders with onset usually occurring in childhood and adolescence (f90-f98).

F91.2 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

This code does not map to a CMS-HCC V28 payment category. Capture depends on documentation that supports the diagnosis; verify the HCC assignment against the current CMS mapping for the applicable payment year. Coders reviewing F91.2 should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC, capturing the correct specificity is the highest-impact RAF improvement available within accurate coding.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F91.2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document onset at or after age 10 to differentiate from childhood-onset conduct disorder
•Note that adolescent-onset type typically has better prognosis than childhood-onset

Clinical Significance

Adolescent-onset conduct disorder is characterized by the absence of conduct disorder symptoms before age 10, with problematic behaviors emerging during adolescence. This subtype generally has a better prognosis than childhood-onset type, with lower rates of physical aggression and higher likelihood of resolution by adulthood. However, it still carries significant risks for academic failure, substance use, and legal problems during adolescence.

Documentation Requirements

✓Provider documentation of conduct disorder with no characteristic symptoms before age 10
✓Evidence of persistent pattern of behavior violating others' rights or societal norms beginning in adolescence
✓Documentation confirming absence of conduct symptoms in childhood (before age 10)
✓Assessment of contributing factors (peer influence, substance use, family dynamics)
✓Treatment plan appropriate for adolescent-onset presentation

Commonly Confused Codes

•F91.1: Conduct disorder, childhood-onset type; childhood-onset has symptoms before age 10 with worse prognosis
•F91.3: Oppositional defiant disorder; ODD involves less severe defiant behavior without violations of others' rights
•Z72.810: Child and adolescent antisocial behavior; for isolated antisocial acts not meeting conduct disorder criteria
•F91.9: Conduct disorder, unspecified; use F91.2 when adolescent onset is documented