1. ICD-10-CM Codes
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2. Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities
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3. Q00-Q07 Congenital malformations of the nervous system
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4. Q04- Other congenital malformations of brain
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5. 2021 ICD-10-CM Diagnosis Code Q04.8

2021 ICD-10-CM Diagnosis Code Q04.8

Other specified congenital malformations of brain

2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

• Q04.8 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 Q04.8 became effective on October 1, 2020.
• This is the American ICD-10-CM version of Q04.8 - other international versions of ICD-10 Q04.8 may differ.

• Congenital cerebral ventriculomegaly
• Congenital ventriculomegaly
• Macrogyria
• Ventriculomegaly, brain

• Q04.8 is considered exempt from POA reporting.

• 091 Other disorders of nervous system with mcc
• 092 Other disorders of nervous system with cc
• 093 Other disorders of nervous system without cc/mcc
• 791 Prematurity with major problems
• 793 Full term neonate with major problems

Convert Q04.8 to ICD-9-CM

• 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

• Type 1 Excludes: Q07.0
  ICD-10-CM Diagnosis Code Q07.0

  Arnold-Chiari syndrome

  2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code

  Applicable To

  • Arnold-Chiari syndrome, type II

  Type 1 Excludes

  • Arnold-Chiari syndrome, type III (Q01.-)
  • Arnold-Chiari syndrome, type IV (Q04.8)

• Anomaly, anomalous (congenital) (unspecified type) Q89.9
  ICD-10-CM Diagnosis Code Q89.9

  Congenital malformation, unspecified

  2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

  Applicable To

  • Congenital anomaly NOS
  • Congenital deformity NOS
  • meninges Q07.9
    ICD-10-CM Diagnosis Code Q07.9

    Congenital malformation of nervous system, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

    Applicable To

    • Congenital anomaly NOS of nervous system
    • Congenital deformity NOS of nervous system
    • Congenital disease or lesion NOS of nervous system
    • cerebral Q04.8
• Arnold-Chiari disease, obstruction or syndrome (type II) Q07.00
  ICD-10-CM Diagnosis Code Q07.00

  Arnold-Chiari syndrome without spina bifida or hydrocephalus

  2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
  • type IV Q04.8
• Deformity Q89.9
  ICD-10-CM Diagnosis Code Q89.9

  Congenital malformation, unspecified

  2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

  Applicable To

  • Congenital anomaly NOS
  • Congenital deformity NOS
  • meninges or membrane (congenital) Q07.9
    ICD-10-CM Diagnosis Code Q07.9

    Congenital malformation of nervous system, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

    Applicable To

    • Congenital anomaly NOS of nervous system
    • Congenital deformity NOS of nervous system
    • Congenital disease or lesion NOS of nervous system
    • cerebral Q04.8
• Dilatation
  • ventricular, ventricle (acute) (chronic) - see also Hypertrophy, cardiac
    • cerebral, congenital Q04.8
• Displacement, displaced
  • brain stem, caudal Q04.8 (congenital)
  • cerebellum, caudal Q04.8 (congenital)
• Distortion(s) (congenital)
  • gyri Q04.8
• Ectopic, ectopia (congenital)
  • brain Q04.8
  • cerebral Q04.8
• Heterotopia, heterotopic - see also Malposition, congenital
  • cerebralis Q04.8
• Macrogyria Q04.8 (congenital)
• Malformation (congenital) - see also Anomaly
  • brain (multiple) Q04.9
    ICD-10-CM Diagnosis Code Q04.9

    Congenital malformation of brain, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

    Applicable To

    • Congenital anomaly NOS of brain
    • Congenital deformity NOS of brain
    • Congenital disease or lesion NOS of brain
    • Multiple anomalies NOS of brain, congenital
    • specified type NEC Q04.8
  • meninges or membrane (congenital) Q07.9
    ICD-10-CM Diagnosis Code Q07.9

    Congenital malformation of nervous system, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

    Applicable To

    • Congenital anomaly NOS of nervous system
    • Congenital deformity NOS of nervous system
    • Congenital disease or lesion NOS of nervous system
    • cerebral Q04.8
• Malposition
  • congenital
    • brain tissue Q04.8
• Softening
  • brain (necrotic) (progressive) G93.89
    ICD-10-CM Diagnosis Code G93.89

    Other specified disorders of brain

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Postradiation encephalopathy
    • congenital Q04.8
• Ulegyria Q04.8

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