Disorders of tryptophan metabolism

This code signifies a group of rare genetic conditions characterized by the body's inability to properly break down or utilize tryptophan, an essential amino acid. These disorders can lead to an accumulation of toxic byproducts or deficiencies in necessary metabolites, impacting various bodily systems, particularly neurological function.

Use this code when documentation specifies a diagnosed disorder of tryptophan metabolism, such as Hartnup disease, blue diaper syndrome (L-tryptophan malabsorption), or other specific enzymatic defects affecting tryptophan pathways. Supporting documentation should include genetic testing results, metabolic screening, or clinical findings consistent with these rare conditions.

• Ensure the documentation clearly specifies a disorder of tryptophan metabolism, not just an abnormal tryptophan level without a diagnosed underlying condition.
• Distinguish from disorders of other amino acid metabolisms; this code is specific to tryptophan.
• Always review the medical record for any associated neurological, dermatological, or gastrointestinal manifestations that may require additional coding.