Disorders of gamma aminobutyric acid metabolism

This code represents a group of rare genetic conditions affecting the body's ability to properly synthesize, break down, or transport gamma-aminobutyric acid (GABA), a primary inhibitory neurotransmitter. These disorders lead to an accumulation or deficiency of GABA or its precursors, disrupting normal brain function. Clinical manifestations often include neurological symptoms such as seizures, developmental delay, and movement disorders.

Assign this code when documentation specifies a confirmed diagnosis of a disorder related to GABA metabolism, such as succinic semialdehyde dehydrogenase deficiency (SSADH deficiency) or GABA-transaminase deficiency. This code is appropriate when laboratory findings, genetic testing, or clinical presentation definitively point to a primary metabolic defect involving GABA pathways.

• Ensure the physician documentation explicitly states a "disorder of GABA metabolism" or a specific condition falling under this category.
• Do not use this code for secondary GABA imbalances resulting from other neurological conditions; it is reserved for primary metabolic defects.
• Consider sequencing this code as the primary diagnosis when it is the main reason for the encounter, especially in the context of diagnostic workup or management of the metabolic disorder.