E72.29
BillableOther disorders of urea cycle metabolism
HCC Category Mapping
V24HCC 23 — Other Significant Endocrine and Metabolic Disorders
0.230ESRDHCC 23 — Other Significant Endocrine and Metabolic Disorders
0.000RxHCCHCC 43 — Other Significant Endocrine and Metabolic Disorders
0.000What 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
E72.20 — Disorder of urea cycle metabolism, unspecified: use when specific enzyme defect is not documentedE72.21 — Argininemia: specific urea cycle defect involving arginase deficiencyE72.22 — Arginosuccinic aciduria: specific deficiency of argininosuccinate lyaseE72.23 — Citrullinemia: specific deficiency of argininosuccinate synthetaseE72.4 — Disorders of ornithine metabolism: ornithine-related but distinct from urea cycle enzyme deficiencies
Code Hierarchy
└E72Other disorders of amino-acid metabolism└E72.2Disorders of urea cycle metabolism└E72.29Other disorders of urea cycle metabolism
└E72.29Other disorders of urea cycle metabolism