What is ICD-10 code F84.5?

F84.5 is the ICD-10-CM diagnosis code for Asperger's syndrome. A developmental condition characterized by difficulties in social interaction and communication, along with restricted or repetitive interests and behaviors, but with normal language and cognitive development. F84.5 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F84.5 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. F84.5 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. F84.5 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 F84.5?

F84.5 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 F84.5 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 F84.5?

Verify that language development and cognitive abilities are within normal range to distinguish from other autism spectrum presentations Document the specific social and behavioral difficulties observed

F84.5: Asperger's syndrome — ICD-10

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupF84.5Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Pervasive and specific developmental disorders (F80-F89)

F84.5

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

Asperger's syndrome

A developmental condition characterized by difficulties in social interaction and communication, along with restricted or repetitive interests and behaviors, but with normal language and cognitive development.

Buddy Insight

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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Compare selected patient codes to show trumped or trumps impact.

Code Book Path

Official

F84Pervasive developmental disorders

F84.5Asperger's syndrome

Inclusion Terms

Official

Asperger's disorder
Autistic psychopathy
Schizoid disorder of childhood

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F84.5 in this effective period.

Related Child Codes

Official

F84.0Autistic disorder

F84.2Rett's syndrome

F84.3Other childhood disintegrative disorder

F84.8Other pervasive developmental disorders

F84.9Pervasive developmental disorder, unspecified

Includes

Official

ICD-10-CM does not list Includes notes for F84.5 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F84.5 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F84.5 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F84.5 in this effective period.

Code Also

Official

any associated medical condition and intellectual disabilities

Buddy Documentation Tip

HCC Buddy guidance

Provider documentation of Asperger's syndrome or Asperger's disorder diagnosis

Evidence of qualitative impairment in social interaction (e.g., impaired nonverbal behaviors, failure to develop peer relationships, lack of social reciprocity)

Evidence of restricted, repetitive, and stereotyped patterns of behavior, interests, and activities

Documentation that there was no clinically significant general delay in language or cognitive development

MEAT Support

HCC Buddy guidance

Provider documentation of Asperger's syndrome or Asperger's disorder diagnosis

Evidence of qualitative impairment in social interaction (e.g., impaired nonverbal behaviors, failure to develop peer relationships, lack of social reciprocity)

Evidence of restricted, repetitive, and stereotyped patterns of behavior, interests, and activities

Documentation that there was no clinically significant general delay in language or cognitive development

Audit Caution

HCC Buddy guidance

Using F84.0 (autistic disorder) when the provider specifically documents Asperger's syndrome — respect the provider's documented diagnosis

Using F84.9 (unspecified PDD) when Asperger's is clearly documented

Failing to report Asperger's in adult encounters because it was diagnosed in childhood — it is a lifelong condition

Coding social communication difficulties alone as Asperger's when restricted/repetitive behaviors are not documented

Common Mistakes

HCC Buddy guidance

F84.0 — Autistic disorder; autism typically includes language delay, while Asperger's does not

F84.9 — Pervasive developmental disorder, unspecified; use F84.5 specifically when Asperger's is documented

F80.89 — Social (pragmatic) communication disorder; social communication disorder lacks the restricted/repetitive behaviors

F84.8 — Other pervasive developmental disorders; use F84.5 for Asperger's, not the 'other' code

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 F84.5 an HCC code?

No. F84.5 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 F84.5

For F84.5to 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 F84.5 during that encounter, not just copy-forwarded from a problem list.

What This Code Means

F84.5 is the ICD-10-CM diagnosis code for asperger's syndrome. A developmental condition characterized by difficulties in social interaction and communication, along with restricted or repetitive interests and behaviors, but with normal language and cognitive development. F84.5 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering pervasive and specific developmental disorders (f80-f89).

F84.5 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.

F84.5 does not map to any HCC in V28 or V24 models. RxHCC maps to 133 (0.000). No direct RAF score contribution. Code for clinical accuracy and to support behavioral health service authorization. Coders reviewing F84.5 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 F84.5 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Verify that language development and cognitive abilities are within normal range to distinguish from other autism spectrum presentations
•Document the specific social and behavioral difficulties observed

Clinical Significance

Asperger's syndrome is characterized by significant difficulties in social interaction and restricted, repetitive patterns of behavior and interests, without the clinically significant language delay seen in classic autism. Although DSM-5 subsumed Asperger's under autism spectrum disorder, ICD-10-CM retains a separate code. Many patients and providers continue to use this diagnosis for individuals with average or above-average intelligence and intact language who have significant social deficits.

Documentation Requirements

✓Provider documentation of Asperger's syndrome or Asperger's disorder diagnosis
✓Evidence of qualitative impairment in social interaction (e.g., impaired nonverbal behaviors, failure to develop peer relationships, lack of social reciprocity)
✓Evidence of restricted, repetitive, and stereotyped patterns of behavior, interests, and activities
✓Documentation that there was no clinically significant general delay in language or cognitive development
✓Current functional assessment and treatment plan including social skills interventions

Commonly Confused Codes

•F84.0: Autistic disorder; autism typically includes language delay, while Asperger's does not
•F84.9: Pervasive developmental disorder, unspecified; use F84.5 specifically when Asperger's is documented
•F80.89: Social (pragmatic) communication disorder; social communication disorder lacks the restricted/repetitive behaviors
•F84.8: Other pervasive developmental disorders; use F84.5 for Asperger's, not the 'other' code