Other GM2 gangliosidosis

This code represents a rare, inherited metabolic disorder characterized by the accumulation of GM2 gangliosides in the brain and other tissues due to a deficiency in the beta-hexosaminidase enzyme. It encompasses variants of GM2 gangliosidosis that do not fit the specific criteria for Tay-Sachs disease (E75.01) or Sandhoff disease (E75.02). Patients typically present with progressive neurological deterioration, including developmental regression, seizures, and motor weakness.

Use this code for patients diagnosed with a form of GM2 gangliosidosis that is not specified as Tay-Sachs or Sandhoff disease. This diagnosis is typically confirmed through enzyme assays demonstrating beta-hexosaminidase deficiency and/or genetic testing identifying specific mutations. Documentation should clearly indicate the diagnosis of GM2 gangliosidosis and rule out the more common subtypes.

• Ensure documentation specifies "other" GM2 gangliosidosis or provides details that exclude Tay-Sachs and Sandhoff diseases.
• Do not use this code if the documentation clearly identifies Tay-Sachs (E75.01) or Sandhoff disease (E75.02).
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, especially for diagnostic workups or management of the condition.