ICD-10-CM Code Q04.6
Congenital cerebral cysts
Billable CodeBillable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
POA Exempt CodeThe Center for Medicare & Medicaid Services (CMS) requires medical coders to indicate whether or not a condition was present at the time of admission, in order to properly assign MS-DRG codes. This "Present On Admission" (POA) indicator is recorded on CMS form 4010A.
Q04.6 is a billable ICD code used to specify a diagnosis of congenital cerebral cysts. A 'billable code' is detailed enough to be used to specify a medical diagnosis.
POA Indicators on CMS form 4010A are as follows:
|Indicator||Meaning||CMS Will Pay CC/MCC DRG Costs|
|Y||Diagnosis was present at time of inpatient admission||Yes|
|N||Diagnosis was not present at time of inpatient admission||No|
|U||Documentation insufficient to determine if the condition was present at the time of inpatient admission.||No|
|W||Clinically undetermined. Provider unable to clinically determine whether the condition was present at the time of inpatient admission.||Yes|
|1||Exempt from POA reporting||No|
The ICD code Q046 is used to code Cortical dysplasia
Focal cortical dysplasia (FCD) is a congenital abnormality of brain development where the neurons in an area of the brain failed to migrate in the proper formation in utero. Focal cortical dysplasia is a common cause of intractable epilepsy in children and is a frequent cause of epilepsy in adults. There are several subtypes of FCD including type 1a, 1b, 2a, 2b, 3a, 3b, and 3c, each with distinct histopathological features. All forms of focal cortical dysplasia lead to disorganization of the normal structure of the cerebral cortex.Type 1 FCD exhibits subtle alterations in cortical lamination. Type 2a FCD exhibits neurons that are larger than normal that are called cytomegalic dysmorphic neurons (CDN). FCD type 2b exhibits complete loss of laminar structure, and the presence of CDN and enlarged cells are called balloon cells (BC) for their large elliptical cell body shape, laterally displaced nucleus, and lack of dendrites or axons. The developmental origin of balloon cells is currently believed to be derived from neuronal or glial progenitor cells. Balloon cells are similar in structure to giant cells in the disorder tuberous sclerosis complex. Recent studies have demonstrated that FCD types 2a and 2b result from somatic mutations in genes that encode components of the mammalian target of rapamycin (mTOR) pathway. Causative gene mutations for types 1 and 3 have not been identified. The mTOR pathway regulates a number of functions in the brain including establishment of cell size, cell motility, and differentiation. Gene mutations associated with FCD2a and FCD 2b include MTOR, PI3KCA, AKT3, and DEPDC5. Mutations in these genes lead to enhanced mTOR pathway signaling at critical periods in brain development. Some recent evidence may suggest a role for in utero infection with certain viruses such as cytomegalovirus and human papilloma virus .
|MeSH Codes:||, , , D020863, D020863|
|ICD 9 Codes:||742.4, 348.0, 742.4, 348.0, 742.4|
Coding Notes for Q04.6 Info for medical coders on how to properly use this ICD-10 code
Inclusion TermsInclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Code Type-1 Excludes:
Type-1 ExcludesType-1 Excludes mean the conditions excluded are mutually exclusive and should never be coded together. Excludes 1 means "do not code here."
- Acquired porencephalic cyst - instead, use code G93.0
- DRG Group #091-093 - Other disorders of nervous system with MCC.
- DRG Group #091-093 - Other disorders of nervous system with CC.
- DRG Group #091-093 - Other disorders of nervous system without CC or MCC.
- DRG Group #793 - Full term neonate with major problems.
Related Concepts SNOMET-CT
- Colloid cyst of third ventricle (disorder)
ICD-10-CM Alphabetical Index References for 'Q04.6 - Congenital cerebral cysts'
The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code Q04.6. Click on any term below to browse the alphabetical index.
Equivalent ICD-9 Code GENERAL EQUIVALENCE MAPPINGS (GEM)
This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code Q04.6 and a single ICD9 code, 742.4 is an approximate match for comparison and conversion purposes.