2021 ICD-10-CM Diagnosis Code F44.9

Dissociative and conversion disorder, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • F44.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM F44.9 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of F44.9 - other international versions of ICD-10 F44.9 may differ.
Applicable To
  • Dissociative disorder NOS
The following code(s) above F44.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to F44.9:
  • F01-F99
    2021 ICD-10-CM Range F01-F99

    Mental, Behavioral and Neurodevelopmental disorders

    • disorders of psychological development
    Type 2 Excludes
    • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
    Mental, Behavioral and Neurodevelopmental disorders
  • F44
    ICD-10-CM Diagnosis Code F44

    Dissociative and conversion disorders

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    • conversion hysteria
    • conversion reaction
    • hysteria
    • hysterical psychosis
    Type 2 Excludes
    • malingering [conscious simulation] (Z76.5)
    Dissociative and conversion disorders
Approximate Synonyms
  • Anxiety hysteria
  • Conversion reaction, psychogenic
  • Dissociative disorder
  • Hysteria
  • Psychologic conversion disorder
Clinical Information
  • A category of psychiatric disorders which are characterized by a disruption in the usually integrated functions of consciousness, memory, identity, and/or perception of the environment.
  • Mental disorders characterized by disruptions and/or alterations in the normally integrated functions of consciousness, memory, or identity. Compare dissociation.
  • Sudden temporary alterations in the normally integrative functions of consciousness.
ICD-10-CM F44.9 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 880 Acute adjustment reaction and psychosocial dysfunction

Convert F44.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to F44.9:
  • Attack, attacks
    • hysterical F44.9
  • Conversion hysteria, neurosis or reaction F44.9
  • Disorder (of) - see also Disease
  • Dissociative reaction, state F44.9
  • Hysteria, hysterical (conversion) (dissociative state) F44.9
    • psychosis, acute F44.9
  • Neurosis, neurotic F48.9
    ICD-10-CM Diagnosis Code F48.9

    Nonpsychotic mental disorder, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Neurosis NOS
    • conversion F44.9
    • hysterical F44.9
  • Psychoneurosis, psychoneurotic - see also Neurosis
    • hysteria F44.9
  • Psychosis, psychotic F29
    ICD-10-CM Diagnosis Code F29

    Unspecified psychosis not due to a substance or known physiological condition

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Psychosis NOS
    • Unspecified schizophrenia spectrum and other psychotic disorder
    Type 1 Excludes
    • mental disorder NOS (F99)
    • unspecified mental disorder due to known physiological condition (F09)
    • acute (transient) F23
      ICD-10-CM Diagnosis Code F23

      Brief psychotic disorder

        2016 2017 2018 2019 2020 2021 Billable/Specific Code
      Applicable To
      • Paranoid reaction
      • Psychogenic paranoid psychosis
      Type 2 Excludes
      • hysterical F44.9
    • hysterical F44.9 (acute)
  • Reaction - see also Disorder
    • conversion F44.9
    • dissociative F44.9
    • hysterical F44.9
  • State (of)
    • dissociative F44.9
  • Substitution disorder F44.9

ICD-10-CM Codes Adjacent To F44.9
F44.0 Dissociative amnesia
F44.1 Dissociative fugue
F44.2 Dissociative stupor
F44.4 Conversion disorder with motor symptom or deficit
F44.5 Conversion disorder with seizures or convulsions
F44.6 Conversion disorder with sensory symptom or deficit
F44.7 Conversion disorder with mixed symptom presentation
F44.8 Other dissociative and conversion disorders
F44.81 Dissociative identity disorder
F44.89 Other dissociative and conversion disorders
F44.9 Dissociative and conversion disorder, unspecified
F45 Somatoform disorders
F45.0 Somatization disorder
F45.1 Undifferentiated somatoform disorder
F45.2 Hypochondriacal disorders
F45.20 Hypochondriacal disorder, unspecified
F45.21 Hypochondriasis
F45.22 Body dysmorphic disorder
F45.29 Other hypochondriacal disorders
F45.4 Pain disorders related to psychological factors
F45.41 Pain disorder exclusively related to psychological factors

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.