ICD-10-CM Code Q04.8

Other specified congenital malformations of brain

Version 2020 Billable Code POA Exempt

Valid for Submission

Q04.8 is a billable code used to specify a medical diagnosis of other specified congenital malformations of brain. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code Q04.8 might also be used to specify conditions or terms like 3c syndrome, abnormality of neurogenesis, aplasia of optic nerve, aprosencephaly, athabaskan brainstem dysgenesis syndrome, cednik syndrome, etc The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

Short Description:Other specified congenital malformations of brain
Long Description:Other specified congenital malformations of brain

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code Q04.8:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Arnold-Chiari syndrome, type IV
  • Macrogyria

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code Q04.8 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • 3C syndrome
  • Abnormality of neurogenesis
  • Aplasia of optic nerve
  • Aprosencephaly
  • Athabaskan brainstem dysgenesis syndrome
  • CEDNIK syndrome
  • Central bilateral macrogyria
  • Cerebellar hemangioblastomatosis
  • Cerebral ventriculomegaly
  • Cerebro-facio-thoracic dysplasia
  • Chiari malformation
  • Chiari malformation type IV
  • Coffin-Siris syndrome
  • Colpocephaly
  • Communicating hydrocephalus co-occurrent and due to congenital agenesis of arachnoid villi
  • Congenital abnormal shape of cerebellum
  • Congenital abnormal shape of cerebrum
  • Congenital cerebral ventriculomegaly
  • Congenital intrauterine infection-like syndrome
  • Congenital pseudobulbar palsy
  • Congenital sequelae of disorders
  • Cortical dysplasia
  • Cortical dysplasia with focal epilepsy syndrome
  • Cortical dysplasia with hemimegalencephaly
  • Cystic malformation of posterior fossa
  • Dandy-Walker syndrome
  • Defect of telencephalic division
  • Dentate dysplasia
  • Diencephalic mesencephalic junction dysplasia
  • Early secondary malformation of the central nervous system
  • Ecchordosis physaliphora
  • Ectopic glial tissue
  • Ectopic gray matter
  • Ectopic gray matter
  • Ectopic gray matter in centrum ovale
  • Ehlers-Danlos syndrome with periventricular heterotopia
  • Encephalo-ophthalmic dysplasia
  • Exencephaly
  • FOXG1 syndrome
  • Gelastic seizure
  • Gillespie syndrome
  • Hamartoma of brain
  • Hamartoma of hypothalamus
  • Hypothalamic hamartoma with gelastic seizure
  • Isolated focal cortical dysplasia
  • Laminar heterotopia
  • Late secondary abnormalities of the central nervous system
  • Localized cortical dysplasia
  • Macrogyria
  • Microdysgenesis
  • Nasal glial heterotopia
  • Neuronal heterotopia
  • Neuronal heterotopia
  • Neuronal heterotopia
  • Nodular heterotopia
  • Oculocerebral dysplasia syndrome
  • Olivary heterotopia
  • Olive dysplasia
  • Pettigrew syndrome
  • Posterior fossa brain malformation, haemaniogma, arterial anomaly, cardiac defect and aortic coarctation, eye abnormality synodrome and sternal anomaly syndrome
  • Posterior fossa brain malformation, hemangioma, arterial anomaly, cardiac defect and aortic coarctation, and eye abnormality syndrome
  • PPM-X syndrome
  • Pseudobulbar palsy
  • Subcortical nodular heterotopia
  • Subependymal nodular heterotopia
  • Ulegyria

Present on Admission (POA)

Q04.8 is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here .

CMS POA Indicator Options and Definitions
POA Indicator CodePOA Reason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Convert Q04.8 to ICD-9

  • 742.4 - Brain anomaly NEC (Approximate Flag)

Code Classification

  • Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • Congenital malformations of the nervous system (Q00-Q07)
      • Other congenital malformations of brain (Q04)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

Brain Malformations

Most brain malformations begin long before a baby is born. Something damages the developing nervous system or causes it to develop abnormally. Sometimes it's a genetic problem. In other cases, exposure to certain medicines, infections, or radiation during pregnancy interferes with brain development. Parts of the brain may be missing, abnormally small or large, or not fully developed.

Treatment depends upon the problem. In many cases, treatment only helps with symptoms. It may include antiseizure medicines, shunts to drain fluid from the brain, and physical therapy.

There are head malformations that do not involve the brain. Craniofacial disorders are the result of abnormal growth of soft tissue and bones in the face and head. It's common for new babies to have slightly uneven heads, but parents should watch the shape of their baby's head for possible problems.

NIH: National Institute of Neurological Disorders and Stroke

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