E70.89

HCC Category Mapping

What This Code Means

Other rare metabolic disorders affecting aromatic amino acids (like phenylalanine, tyrosine, and tryptophan) not classified elsewhere.

Coding Tips

• •Use this code for aromatic amino acid metabolism disorders that don't fit into other specific categories
• •Document the specific amino acid involved and the nature of the metabolic defect to support medical necessity and guide treatment

Clinical Significance

Other disorders of aromatic amino-acid metabolism captures rare metabolic conditions affecting aromatic amino acids (phenylalanine, tyrosine, tryptophan, and histidine) that do not fit into other specific categories. These include uncommon enzyme deficiencies and variant forms of amino acid processing disorders that may present with neurological, dermatological, or systemic manifestations depending on the specific metabolic defect.

Documentation Requirements

• ✓Documentation should identify the specific amino acid and metabolic pathway affected, supporting laboratory evidence (amino acid levels, organic acid analysis, enzyme assays, or genetic testing), clinical manifestations, and current treatment approach.
• ✓The provider should explain why more specific codes within the E70 category do not apply.
• ✓Any organ-specific complications should be detailed.

Commonly Confused Codes