What is ICD-10 code F98.4?

F98.4 is the ICD-10-CM diagnosis code for Stereotyped movement disorders. Repetitive, purposeless movements or postures that are not part of a medical condition, such as body rocking, head banging, or hand flapping. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F98.4 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F98.4 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. F98.4 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. F98.4 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 F98.4?

F98.4 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 F98.4 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 F98.4?

Differentiate from tics (which are involuntary) and from stereotyped movements associated with autism or intellectual disability Document the specific movements, frequency, and whether they cause self-injury or functional impairment

F98.4: Stereotyped movement disorders — ICD-10

ICD-10-CM Code View

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Code lookupF98.4Effective 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)

F98.4

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

Stereotyped movement disorders

Repetitive, purposeless movements or postures that are not part of a medical condition, such as body rocking, head banging, or hand flapping.

Buddy Insight

Stereotyped movement disorders represent repetitive, purposeless motor behaviors that may cause self-injury and require ongoing behavioral health management.

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

Code Trumping

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Code Book Path

Official

F98Other behavioral and emotional disorders with onset usually occurring in childhood and adolescence

F98.4Stereotyped movement disorders

Inclusion Terms

Official

Stereotype/habit disorder

Excludes 2

Official

compulsions in obsessive-compulsive disorder (F42.-)
hair plucking (F63.3)
movement disorders of organic origin (G20-G25)
nail-biting (F98.8)
nose-picking (F98.8)

Related Child Codes

Official

F98.0Enuresis not due to a substance or known physiological condition

F98.1Encopresis not due to a substance or known physiological condition

F98.2Other feeding disorders of infancy and childhood

F98.3Pica of infancy and childhood

F98.5Adult onset fluency disorder

Includes

Official

ICD-10-CM does not list Includes notes for F98.4 in this effective period.

Excludes 1

Official

abnormal involuntary movements (R25.-)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F98.4 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F98.4 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F98.4 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Description of specific stereotyped movements (body rocking, head banging, hand flapping)

Frequency, duration, and intensity of episodes

Whether movements cause self-injury or functional impairment

Distinction from tics or movements associated with other conditions

MEAT Support

HCC Buddy guidance

Description of specific stereotyped movements (body rocking, head banging, hand flapping)

Frequency, duration, and intensity of episodes

Whether movements cause self-injury or functional impairment

Distinction from tics or movements associated with other conditions

Audit Caution

HCC Buddy guidance

Confusing stereotyped movements with tics — tics are brief, involuntary, and sudden; stereotypies are rhythmic and prolonged

Coding F98.4 when the stereotyped movement is a manifestation of autism spectrum disorder without separate documentation

Failing to document whether the movements are self-injurious, which affects treatment planning

Not ruling out medication-induced movement disorders before assigning this code

Common Mistakes

HCC Buddy guidance

F95.9 — Tic disorder, unspecified: tics are involuntary and sudden, while stereotyped movements are rhythmic and voluntary

F84.0 — Autistic disorder: stereotyped movements may be a feature of autism but should be coded separately when documented as a distinct disorder

F98.4 vs G25.3 — Drug-induced stereotyped movements are coded under G25.3, not F98.4

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 F98.4 an HCC code?

No. F98.4 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.

Work F98.4 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F98.4

For F98.4to 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 F98.4 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F98.4 is the ICD-10-CM diagnosis code for stereotyped movement disorders. Repetitive, purposeless movements or postures that are not part of a medical condition, such as body rocking, head banging, or hand flapping. F98.4 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).

F98.4 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.

F98.4 maps only to RxHCC 133 (Chronic Kidney Disease, Stage 3) with a 0.0 RAF weight. It does not map to CMS-HCC V28 or V24 categories. This code carries no meaningful risk adjustment impact in standard Medicare Advantage payment models.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F98.4 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Differentiate from tics (which are involuntary) and from stereotyped movements associated with autism or intellectual disability
•Document the specific movements, frequency, and whether they cause self-injury or functional impairment

Clinical Significance

Stereotyped movement disorders represent repetitive, purposeless motor behaviors that may cause self-injury and require ongoing behavioral health management. Proper documentation is important because these movements often coexist with autism spectrum disorder or intellectual disabilities, and accurate coding ensures comprehensive care planning.

Documentation Requirements

✓Description of specific stereotyped movements (body rocking, head banging, hand flapping)
✓Frequency, duration, and intensity of episodes
✓Whether movements cause self-injury or functional impairment
✓Distinction from tics or movements associated with other conditions
✓Co-occurring diagnoses (autism spectrum disorder, intellectual disability)
✓Current treatment or behavioral interventions in place

Excludes 1, Do NOT code together

abnormal involuntary movements (R25.-)

Excludes 2, Not included here, may code separately

compulsions in obsessive-compulsive disorder (F42.-)
hair plucking (F63.3)
movement disorders of organic origin (G20-G25)
nail-biting (F98.8)
nose-picking (F98.8)
stereotypies that are part of a broader psychiatric condition (F01-F95)
thumb-sucking (F98.8)
tic disorders (F95.-)
trichotillomania (F63.3)

Commonly Confused Codes

•F95.9: Tic disorder, unspecified: tics are involuntary and sudden, while stereotyped movements are rhythmic and voluntary
•F84.0: Autistic disorder: stereotyped movements may be a feature of autism but should be coded separately when documented as a distinct disorder
•F98.4 vs G25.3: Drug-induced stereotyped movements are coded under G25.3, not F98.4