E75.4

HCC Category Mapping

What This Code Means

A group of rare inherited neurological disorders characterized by progressive accumulation of lipofuscin (a fatty pigment) in nerve cells, causing progressive dementia and loss of function.

Coding Tips

• •Document the age of onset and clinical presentation (infantile, late infantile, juvenile, or adult form)
• •Link to associated symptoms such as vision loss, seizures, or cognitive decline

Clinical Significance

Neuronal ceroid lipofuscinosis (NCL) encompasses a group of inherited neurodegenerative lysosomal storage disorders characterized by progressive accumulation of autofluorescent lipopigments in neurons and other cells. These are among the most common neurodegenerative disorders of childhood, causing seizures, vision loss, cognitive decline, and premature death, requiring extensive supportive care resources.

Documentation Requirements

• ✓Specific NCL type if known (CLN1-CLN14 or infantile, late infantile, juvenile, adult forms)
• ✓Confirmatory diagnostic evidence (genetic testing identifying CLN gene mutations, enzyme assay, or electron microscopy showing curvilinear profiles)
• ✓Current neurological status and functional assessment
• ✓Seizure frequency and anticonvulsant management
• ✓Vision status and ophthalmologic findings
• ✓Documentation of progressive nature and disease trajectory

Commonly Confused Codes