What is ICD-10 code F63.9?

F63.9 is the ICD-10-CM diagnosis code for Impulse disorder, unspecified. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F63.9 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F63.9 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. F63.9 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. F63.9 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.

What is the V28 vs V24 difference for F63.9?

F63.9 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 model rewards F63.9 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

What should coders know when reporting F63.9?

Use this code only when the specific impulse disorder (such as pyromania, kleptomania, or trichotillomania) cannot be determined from the medical record; always attempt to document the specific type of impulse disorder if possible Review the clinical documentation carefully to see if the impulse disorder can be more specifically classified, as using the unspecified code may result in lower reimbursement and less precise medical records

F63.9: Impulse disorder, unspecified — ICD-10

ICD-10-CM Code View

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Code lookupF63.9Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Disorders of adult personality and behavior (F60-F69)

F63.9

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

Impulse disorder, unspecified

This code describes a condition where a person has difficulty controlling sudden urges or impulses to do something, but the specific type of impulse disorder has not been identified or documented. It's used when a patient struggles with impulsive behavior that causes problems in their life, but the exact nature of the impulse problem isn't specified.

Buddy Insight

Unspecified impulse disorder is used when the provider documents an impulse control disorder but does not specify the type.

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Not risk-adjusted for this model/period.

RAF 0

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Not risk-adjusted for this model/period.

RAF 0

RXHCC

Mapped

HCC 133

Personality Disorders, Anxiet...

RAF 0.0

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Code Book Path

Official

F63Impulse disorders

F63.9Impulse disorder, unspecified

Inclusion Terms

Official

Impulse control disorder NOS

Excludes 2

Official

habitual excessive use of alcohol or psychoactive substances (F10-F19)
impulse disorders involving sexual behavior (F65.-)

Related Child Codes

Official

F63.0Pathological gambling

F63.1Pyromania

F63.2Kleptomania

F63.3Trichotillomania

F63.8Other impulse disorders

Includes

Official

ICD-10-CM does not list Includes notes for F63.9 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F63.9 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F63.9 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F63.9 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F63.9 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Provider documentation of an impulse control disorder diagnosis

Evidence of recurrent failure to resist impulses leading to harmful acts

Functional impairment documented in social, occupational, or personal domains

Query opportunity — attempt to obtain specificity from the provider to use a more precise code

MEAT Support

HCC Buddy guidance

Provider documentation of an impulse control disorder diagnosis

Evidence of recurrent failure to resist impulses leading to harmful acts

Functional impairment documented in social, occupational, or personal domains

Query opportunity — attempt to obtain specificity from the provider to use a more precise code

Audit Caution

HCC Buddy guidance

Defaulting to F63.9 when the provider documentation supports a specific impulse disorder type — always query for specificity

Coding an impulse disorder when the impulsive behavior is a symptom of another condition (mania, ADHD, substance intoxication)

Using F63.9 for behavioral problems that do not meet the clinical threshold for an impulse control disorder diagnosis

Failing to query the provider when documentation hints at a specific disorder type

Common Mistakes

HCC Buddy guidance

F63.89 — Other impulse disorders; use F63.89 when the provider names a specific impulse disorder that lacks its own code; F63.9 is for truly unspecified cases

F63.81 — Intermittent explosive disorder; if explosive outbursts are described, query for IED diagnosis

R46.81 — Obsessive-compulsive behavior; behavioral observations are not the same as a diagnosed impulse disorder

F42.8 — Other obsessive-compulsive disorder; compulsive behaviors may be OCD-related rather than impulse control disorders

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is F63.9 an HCC code?

No. F63.9 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.

HCC Category Mapping

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

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. 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.

MEAT Criteria for F63.9

For F63.9to 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 F63.9 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F63.9 is the ICD-10-CM diagnosis code for impulse disorder, unspecified. This code describes a condition where a person has difficulty controlling sudden urges or impulses to do something, but the specific type of impulse disorder has not been identified or documented. It's used when a patient struggles with impulsive behavior that causes problems in their life, but the exact nature of the impulse problem isn't specified. F63.9 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering disorders of adult personality and behavior (f60-f69).

F63.9 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.

F63.9 does not map to any HCC in V28 or V24 and has no RAF weight. RxHCC maps to 133 (0.000). No risk adjustment impact. Always pursue specificity when possible for better clinical documentation. Coders reviewing F63.9 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 F63.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code only when the specific impulse disorder (such as pyromania, kleptomania, or trichotillomania) cannot be determined from the medical record; always attempt to document the specific type of impulse disorder if possible
•Review the clinical documentation carefully to see if the impulse disorder can be more specifically classified, as using the unspecified code may result in lower reimbursement and less precise medical records

Clinical Significance

Unspecified impulse disorder is used when the provider documents an impulse control disorder but does not specify the type. While this code is clinically acceptable, it provides less information for care management. Impulse control disorders as a group are associated with significant psychosocial dysfunction and comorbid psychiatric conditions requiring ongoing treatment.

Documentation Requirements

✓Provider documentation of an impulse control disorder diagnosis
✓Evidence of recurrent failure to resist impulses leading to harmful acts
✓Functional impairment documented in social, occupational, or personal domains
✓Query opportunity — attempt to obtain specificity from the provider to use a more precise code
✓Treatment plan addressing the impulse control condition

Commonly Confused Codes

•F63.89: Other impulse disorders; use F63.89 when the provider names a specific impulse disorder that lacks its own code; F63.9 is for truly unspecified cases
•F63.81: Intermittent explosive disorder; if explosive outbursts are described, query for IED diagnosis
•R46.81: Obsessive-compulsive behavior; behavioral observations are not the same as a diagnosed impulse disorder
•F42.8: Other obsessive-compulsive disorder; compulsive behaviors may be OCD-related rather than impulse control disorders