E70.29

HCC Category Mapping

What This Code Means

This code describes metabolic disorders affecting how the body processes tyrosine, an amino acid important for making proteins and certain hormones. These are rare genetic or acquired conditions that don't fit into other specific tyrosine metabolism disorders.

Coding Tips

• •Use this code only after excluding more specific tyrosine metabolism disorders (E70.20-E70.28), such as phenylketonuria or alkaptonuria
• •Ensure documentation specifies the particular tyrosine metabolism abnormality and consider requesting clarification from the provider if the specific disorder type is unclear

Clinical Significance

Other disorders of tyrosine metabolism encompasses rare metabolic conditions affecting tyrosine processing that do not fit into the specific categories of tyrosinemia or unspecified disorders. This includes conditions like alkaptonuria (ochronosis), which causes dark pigmentation of connective tissues and progressive arthropathy, and other variant metabolic defects in the tyrosine degradation pathway.

Documentation Requirements

• ✓Documentation should specify the exact disorder of tyrosine metabolism with supporting laboratory evidence such as urine organic acid analysis, enzyme activity assays, or genetic testing.
• ✓Clinical manifestations, affected organ systems, and current management should be detailed.
• ✓For alkaptonuria, document homogentisic acid levels and any musculoskeletal or cardiovascular complications.

Commonly Confused Codes