Q04.5
BillableMegalencephaly
HCC Category Mapping
V28HCC 182 — Spinal Cord Disorders/Injuries
0.282V24HCC 72 — Spinal Cord Disorders/Injuries
0.464ESRDHCC 72 — Spinal Cord Disorders/Injuries
0.000RxHCCHCC 155 — Myelitis and Encephalomyelitis
0.000What This Code Means
A birth defect where the brain is abnormally large due to excessive brain tissue development.
Coding Tips
- •Distinguish between megalencephaly and hydrocephalus, which may coexist
- •Document whether this is associated with other syndromes or malformations
Clinical Significance
Megalencephaly involves abnormally enlarged brain tissue that can cause increased intracranial pressure, seizures, and developmental delays. This condition requires ongoing neurological monitoring and management of complications including potential need for surgical intervention.
Documentation Requirements
- ✓Documentation of abnormally enlarged brain on neuroimaging
- ✓Head circumference measurements showing macrocephaly
- ✓Neuroimaging findings confirming increased brain tissue volume
- ✓Neurological examination and developmental assessment
- ✓Assessment for increased intracranial pressure signs
- ✓Seizure history and neurological complications
- ✓Genetic evaluation if indicated for underlying causes
- ✓Growth and developmental monitoring plans
Commonly Confused Codes
Q75.3 — Macrocephaly involves enlarged head but may not have increased brain tissueG93.1 — Brain swelling from anoxia is acquired, not congenitalQ03.9 — Hydrocephalus causes head enlargement but from fluid, not tissueQ04.6 — Congenital cerebral cysts cause space-occupying lesions differentlyR94.02 — Abnormal brain scan findings are test results, not diagnoses