Disorder of aromatic amino-acid metabolism, unspecified

This code signifies an inherited metabolic disorder affecting the breakdown of aromatic amino acids (e.g., phenylalanine, tyrosine, tryptophan) where the specific type of disorder is not identified. These conditions can lead to the accumulation of toxic byproducts, potentially causing neurological, developmental, or other systemic issues.

Use this code when documentation indicates a confirmed or suspected metabolic defect involving aromatic amino acids, but the specific enzyme deficiency or pathway affected is not specified. This is appropriate when initial diagnostic workup points to an aromatic amino acid metabolism issue, but further definitive testing is pending or inconclusive.

• Avoid using this code if a more specific disorder of aromatic amino acid metabolism (e.g., phenylketonuria, tyrosinemia) is documented.
• Always query the provider for greater specificity if possible, as more precise codes exist.
• Consider sequencing this code as a primary diagnosis when the metabolic disorder is the focus of the encounter, or as a secondary diagnosis when it contributes to other conditions.