E75.01

HCC Category Mapping

What This Code Means

Sandhoff disease is a rare inherited metabolic disorder where the body cannot break down certain fatty substances in the brain and nerve cells, leading to progressive neurological damage and developmental problems. It typically appears in infancy and causes severe developmental delays, loss of motor skills, blindness, and seizures.

Coding Tips

• •Sandhoff disease is a specific lysosomal storage disorder; ensure you are not confusing it with Tay-Sachs disease (E75.00), which is a related but distinct condition
• •This code requires documentation of the diagnosis and may need to be linked with codes for associated complications such as seizures (G40.-), developmental delays (F88), or vision loss (H54.-) depending on the patient's clinical presentation

Clinical Significance

Sandhoff disease is a rare autosomal recessive lysosomal storage disorder caused by deficiency of both hexosaminidase A and B enzymes, leading to toxic accumulation of GM2 gangliosides and other substrates in neurons and peripheral tissues. Unlike Tay-Sachs, Sandhoff also affects visceral organs. The infantile form is rapidly fatal, while late-onset forms have a more protracted course with progressive neurological decline.

Documentation Requirements

• ✓Confirmed diagnosis of Sandhoff disease
• ✓Enzyme assay showing deficiency of both hexosaminidase A and B
• ✓Genetic testing for HEXB gene mutations if performed
• ✓Form specification: infantile, juvenile, or adult/chronic onset
• ✓Documentation of neurological status and progression
• ✓Visceral organ involvement assessment (hepatosplenomegaly, cardiac)

Commonly Confused Codes