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.
Applicable To
  • Arnold-Chiari syndrome, type IV
  • Macrogyria
The following code(s) above Q04.8 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 Q04.8:
  • Q00-Q99
    2021 ICD-10-CM Range Q00-Q99

    Congenital malformations, deformations and chromosomal abnormalities

    Note
    • Codes from this chapter are not for use on maternal records
    Type 2 Excludes
    • inborn errors of metabolism (E70-E88)
    Congenital malformations, deformations and chromosomal abnormalities
  • Q04
    ICD-10-CM Diagnosis Code Q04

    Other congenital malformations of brain

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    Other congenital malformations of brain
Approximate Synonyms
  • Congenital cerebral ventriculomegaly
  • Congenital ventriculomegaly
  • Macrogyria
  • Ventriculomegaly, brain
Present On Admission
POA Help
"Present On Admission" is defined as present at the time the order for inpatient admission occurs — conditions that develop during an outpatient encounter, including emergency department, observation, or outpatient surgery, are considered POA.
  • Q04.8 is considered exempt from POA reporting.
ICD-10-CM Q04.8 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 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

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
Code annotations containing back-references to Q04.8:
  • 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)

Diagnosis Index entries containing back-references to 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
  • Dilatation
  • 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
  • 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

ICD-10-CM Codes Adjacent To Q04.8
Q03.8 Other congenital hydrocephalus
Q03.9 Congenital hydrocephalus, unspecified
Q04 Other congenital malformations of brain
Q04.0 Congenital malformations of corpus callosum
Q04.1 Arhinencephaly
Q04.2 Holoprosencephaly
Q04.3 Other reduction deformities of brain
Q04.4 Septo-optic dysplasia of brain
Q04.5 Megalencephaly
Q04.6 Congenital cerebral cysts
Q04.8 Other specified congenital malformations of brain
Q04.9 Congenital malformation of brain, unspecified
Q05 Spina bifida
Q05.0 Cervical spina bifida with hydrocephalus
Q05.1 Thoracic spina bifida with hydrocephalus
Q05.2 Lumbar spina bifida with hydrocephalus
Q05.3 Sacral spina bifida with hydrocephalus
Q05.4 Unspecified spina bifida with hydrocephalus
Q05.5 Cervical spina bifida without hydrocephalus
Q05.6 Thoracic spina bifida without hydrocephalus
Q05.7 Lumbar spina bifida without hydrocephalus

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