2026 ICD-10-CM Diagnosis Code F84.9Pervasive developmental disorder, unspecified

ICD-10-CM Codes›F01–F99›F80-F89›F84

ICD-10-CM F84.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F84.9 is a billable ICD-10-CM diagnosis code for pervasive developmental disorder, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurodevelopmental disorders.

Code Identity

ICD-10-CM Code
F84.9
Billable Status
Yes — Valid for Submission
Code Describes
Pervasive developmental disorder, unspecified
Short Description
Pervasive developmental disorder, unspecified
Same as the full description in the CMS dataset.
Parent Code
F84
Pervasive developmental disorders

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF80-F89Pervasive and specific developmental disorders
CategoryF84Pervasive developmental disorders
This CodeF84.9Pervasive developmental disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Active but odd autism
  • Atypical autism
  • Autism spectrum disorder
  • Pervasive developmental disorder of residual state
  • Pervasive developmental disorder with abscence of functional language
  • Pervasive developmental disorder with cognitive developmental delay and complete impairment of functional language
  • Pervasive developmental disorder with cognitive developmental delay and marked impairment of functional language
  • Pervasive developmental disorder with complete impairment of functional language
  • Pervasive developmental disorder with complete impairment of functional language with loss of previously acquired skills
  • Pervasive developmental disorder with complete impairment of functional language without loss of previously acquired skills
  • Pervasive developmental disorder with disorder of intellectual development and absence of functional language with loss of previously acquired skills
  • Pervasive developmental disorder with disorder of intellectual development and complete impairment of functional language with loss of previously acquired skills
  • Pervasive developmental disorder with disorder of intellectual development and complete impairment of functional language without loss of previously acquired skills
  • Pervasive developmental disorder with disorder of intellectual development and marked impairment of functional language with loss of previously acquired skills
  • Pervasive developmental disorder with disorder of intellectual development and marked impairment of functional language without loss of previously acquired skills
  • Pervasive developmental disorder with disorder of intellectual development and pervasive impairment of functional language without loss of previously acquired skills
  • Pervasive developmental disorder with disorder of intellectual development with loss of previously acquired skills
  • Pervasive developmental disorder with disorder of intellectual development without loss of previously acquired skills
  • Pervasive developmental disorder with impairment of functional language
  • Pervasive developmental disorder with marked impairment of functional language with loss of previously acquired skills
  • Pervasive developmental disorder with marked impairment of functional language without loss of previously acquired skills
  • Pervasive developmental disorder with severe impairment of functional language with loss of previously acquired skills
  • Pervasive developmental disorder with severe impairment of functional language without loss of previously acquired skills
  • Savant syndrome

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Atypical autism

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Autism, autistic(childhood) (infantile)
      • atypical
    • Delay, delayed
      • development
        • pervasive
    • Disability, disabilities
      • intellectual
        • with
          • autistic features
    • Disorder(of)
      • developmental
        • pervasive
    • Disorder(of)
      • pervasive, developmental

Clinical ClassificationClinical

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

CCSR MBD014
Neurodevelopmental disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Autism Spectrum Disorder

    wide continuum of associated cognitive and neurobehavioral disorders, including, but not limited to, three core-defining features: impairments in socialization, impairments in verbal and nonverbal communication, and restricted and repetitive patterns of behaviors. (from dsm-v)

  • Autism Spectrum Disorder|Pervasive Developmental Disorders

    a spectrum of developmental disorders that includes autism, asperger syndrome, and rett syndrome. signs and symptoms include poor communication skills, defective social interactions, and repetitive behaviors.

  • Pervasive Developmental Disorder

    a category of developmental disorders characterized by impaired communication and socialization skills. the impairments are incongruent with the individual's developmental level or mental age. these disorders can be associated with general medical or genetic conditions.

Patient EducationClinical

Autism Spectrum Disorder

Autism spectrum disorder (ASD) is a neurological and developmental disorder that begins early in childhood and lasts throughout a person's life. It affects how a person acts and interacts with others, communicates, and learns. It includes what used to be known as Asperger syndrome and pervasive developmental disorders.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert F84.9 to ICD-9-CMHistory

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

ICD-9-CM
299.90 Pervasv dev dis-cur NOS
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 F84.9Overview

Is F84.9 (Pervasive developmental disorders) a billable code?

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

What is the ICD-9 equivalent of F84.9?

Under the General Equivalence Mappings, pervasive developmental disorder, unspecified converts to ICD-9-CM 299.90 (pervasv dev dis-cur NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.