Disorder of urea cycle metabolism, unspecified

This code signifies a metabolic disturbance affecting the body's ability to process and excrete ammonia, specifically within the urea cycle. It indicates a general or unspecified dysfunction in the biochemical pathway responsible for converting toxic ammonia into urea for elimination.

Assign this code when documentation indicates a diagnosis of a urea cycle disorder without further specification of the exact enzyme deficiency or genetic mutation. This is appropriate when the physician has diagnosed a urea cycle metabolism disorder but has not identified a more specific type.

• Avoid using this code if a more specific urea cycle disorder (e.g., ornithine transcarbamylase deficiency, argininosuccinate lyase deficiency) is documented.
• Review the "Excludes1" notes carefully; never code this alongside hyperammonemia-hyperornithinemia-homocitrullinemia syndrome or transient hyperammonemia of newborn.
• Ensure the medical record clearly states "unspecified" or lacks detail regarding the specific type of urea cycle metabolism disorder.