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E72.29

Billable

Other disorders of urea cycle metabolism

HCC Category Mapping

V24HCC 23Other Significant Endocrine and Metabolic Disorders
0.230
ESRDHCC 23Other Significant Endocrine and Metabolic Disorders
0.000
RxHCCHCC 43Other Significant Endocrine and Metabolic Disorders
0.000

What This Code Means

Other rare genetic disorders affecting the urea cycle that are not classified as arginosuccinic aciduria or citrullinemia.

Coding Tips

  • Use this code for urea cycle disorders such as carbamoyl phosphate synthetase deficiency, ornithine transcarbamylase deficiency, or other variants
  • Provide specific documentation of which urea cycle enzyme or process is affected

Clinical Significance

Other disorders of urea cycle metabolism represent serious inborn errors that impair the body's ability to detoxify ammonia, a byproduct of protein metabolism. Hyperammonemia from these disorders can cause irreversible brain damage and is life-threatening if not managed. Accurate capture is critical for risk adjustment as these patients require lifelong dietary management and monitoring.

Documentation Requirements

  • Specific urea cycle enzyme deficiency identified (e.g., carbamoyl phosphate synthetase I deficiency, ornithine transcarbamylase deficiency, N-acetylglutamate synthase deficiency)
  • Laboratory confirmation such as plasma amino acid levels, urine orotic acid, or genetic testing results
  • Current treatment plan including dietary protein restrictions, nitrogen scavenger medications, or supplements
  • Monitoring of ammonia levels and neurological status
  • Clinical manifestations documented (e.g., hyperammonemia episodes, developmental delays, encephalopathy)

Commonly Confused Codes

Code Hierarchy

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