Other disorders of tyrosine metabolism

This code signifies various rare inherited metabolic disorders affecting the breakdown of the amino acid tyrosine, excluding alkaptonuria, tyrosinemia, and oculocutaneous albinism. These conditions result from enzyme deficiencies leading to an accumulation of tyrosine or its metabolites, potentially causing neurological, hepatic, or renal dysfunction.

Assign this code when documentation specifies a diagnosis of an "other" or "unspecified" disorder of tyrosine metabolism that does not fit into more specific categories like tyrosinemia types or alkaptonuria. This is appropriate for conditions such as hawkinsinuria or 4-hydroxyphenylpyruvic acid oxidase deficiency when a more precise code is unavailable. Supporting documentation should clearly state the specific "other" tyrosine metabolism disorder.

• Do not use this code if a more specific ICD-10-CM code exists for the documented tyrosine metabolism disorder (e.g., E70.21 for Tyrosinemia, E70.22 for Alkaptonuria).
• Ensure the medical record specifies the particular "other" disorder to justify its use, rather than a general "disorder of tyrosine metabolism."
• Sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting patient care.