2021 ICD-10-CM Diagnosis Code F79

Unspecified intellectual disabilities

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • F79 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 F79 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of F79 - other international versions of ICD-10 F79 may differ.
Applicable To
  • Mental deficiency NOS
  • Mental subnormality NOS
The following code(s) above F79 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 F79:
  • F01-F99
    2021 ICD-10-CM Range F01-F99

    Mental, Behavioral and Neurodevelopmental disorders

    Includes
    • disorders of psychological development
    Type 2 Excludes
    • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
    Mental, Behavioral and Neurodevelopmental disorders
  • F70-F79
    2021 ICD-10-CM Range F70-F79

    Intellectual disabilities

    Code First
    • any associated physical or developmental disorders
    Type 1 Excludes
    • borderline intellectual functioning, IQ above 70 to 84 (R41.83)
    Intellectual disabilities
Approximate Synonyms
  • Intellectual disability
  • Intellectual functioning disability
Clinical Information
  • A broad category of disorders characterized by an impairment to the intelligence an individual possesses. These impairments can result from trauma, birth or disease and are not restricted to any particular age group.
  • A developmental disorder characterized by less than average intelligence and significant limitations in adaptive behavior with onset before the age of 18.
  • Impaired intellectual (iq below 70) and adaptive functioning manifested during the developmental period. Use a more specific term if possible. Use for both the concept of the disorder itself and for populations of mentally retarded persons.
  • Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (iq) scores are commonly used to determine whether an individual has an intellectual disability. Iq scores between 70 and 79 are in the borderline range. Scores below 67 are in the disabiled range. (from Joynt, Clinical Neurology, 1992, ch55, p28)
  • Subnormal intellectual functioning which originates during the developmental period; multiple potential etiologies, including genetic defects and perinatal insults; intelligence quotient (iq) scores are commonly used to determine whether an individual is mentally retarded; iq scores between 70 and 79 are in the borderline mentally retarded range and scores below 67 are in the retarded range.
ICD-10-CM F79 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 884 Organic disturbances and intellectual disability

Convert F79 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 F79:

ICD-10-CM Codes Adjacent To F79
F68.12 …… with predominantly physical signs and symptoms
F68.13 …… with combined psychological and physical signs and symptoms
F68.A Factitious disorder imposed on another
F68.8 Other specified disorders of adult personality and behavior
F69 Unspecified disorder of adult personality and behavior
F70 Mild intellectual disabilities
F71 Moderate intellectual disabilities
F72 Severe intellectual disabilities
F73 Profound intellectual disabilities
F78 Other intellectual disabilities
F79 Unspecified intellectual disabilities
F80 Specific developmental disorders of speech and language
F80.0 Phonological disorder
F80.1 Expressive language disorder
F80.2 Mixed receptive-expressive language disorder
F80.4 Speech and language development delay due to hearing loss
F80.8 Other developmental disorders of speech and language
F80.81 Childhood onset fluency disorder
F80.82 Social pragmatic communication disorder
F80.89 Other developmental disorders of speech and language
F80.9 Developmental disorder of speech and language, unspecified

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