E70.9

HCC Category Mapping

What This Code Means

This code describes a metabolic disorder affecting how the body processes certain amino acids (building blocks of proteins), but the specific type of disorder is not identified. These amino acids are important for producing neurotransmitters and other vital substances in the body.

Coding Tips

• •Use this unspecified code only when the specific aromatic amino acid disorder (such as phenylketonuria, tyrosinemia, or alkaptonuria) cannot be determined from the medical record
• •Query the provider if more specific diagnostic information is available, as this unspecified code may result in lower reimbursement and lacks clinical specificity

Clinical Significance

Unspecified disorder of aromatic amino-acid metabolism indicates a documented metabolic abnormality affecting aromatic amino acid processing where the specific type of disorder has not been identified. This is the least specific code in the E70 category and should prompt further diagnostic workup and provider query to determine the exact metabolic defect for appropriate management and genetic counseling.

Documentation Requirements

• ✓Documentation should include the laboratory evidence suggesting an aromatic amino acid metabolism abnormality, which specific amino acids are affected if known, current clinical presentation, and the plan for further diagnostic evaluation.
• ✓The provider should document why a more specific diagnosis cannot be established and what additional testing is planned.
• ✓Any clinical manifestations should be described.

Commonly Confused Codes