Other specified disorders of amino-acid metabolism

This code signifies metabolic disorders affecting amino acids that are not specifically classified elsewhere. These conditions involve enzymatic defects or transport protein abnormalities leading to the accumulation or deficiency of particular amino acids or their metabolites. Such disorders can manifest with a wide range of symptoms, from mild to severe, impacting various organ systems.

Use this code for documented diagnoses of amino acid metabolism disorders that do not have a more specific ICD-9-CM code. This includes conditions like hyperornithinemia, hyperlysinemia, or other rare, specified amino acidopathies. Documentation should clearly state the specific amino acid disorder and confirm it's not covered by a more precise code within the 270 series.

• Always review the entire 270 category to ensure a more specific code for the documented amino acid disorder does not exist.
• Avoid using this code if the documentation points to a general "disorder of amino acid metabolism" without further specification; query the provider for clarification.
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, or as a secondary diagnosis when it is a co-morbidity impacting patient care.