E72.4

HCC Category Mapping

What This Code Means

This is a rare metabolic disorder where the body cannot properly process ornithine, an amino acid needed for normal protein metabolism and liver function. This can lead to vision problems, muscle weakness, and other complications if not managed.

Coding Tips

• •Verify the specific type of ornithine metabolism disorder (such as gyrate atrophy) as this code may require additional specificity depending on documentation and payer requirements
• •Look for associated conditions like progressive vision loss or retinal degeneration, as these complications should be coded separately if documented

Clinical Significance

Disorders of ornithine metabolism, such as gyrate atrophy of the choroid and retina and hyperornithinemia-hyperammonemia-homocitrullinuria syndrome, cause progressive vision loss and potentially life-threatening hyperammonemia. These rare genetic conditions require specialized metabolic care, dietary management, and routine ophthalmological monitoring. Risk adjustment capture is important due to the high resource utilization and complex care needs.

Documentation Requirements

• ✓Specific ornithine metabolism disorder identified (e.g., gyrate atrophy, hyperornithinemia-hyperammonemia-homocitrullinuria syndrome)
• ✓Laboratory findings including plasma ornithine levels and relevant enzyme assays
• ✓Genetic testing confirmation if performed
• ✓Documentation of ophthalmological findings if gyrate atrophy is present
• ✓Current treatment plan including dietary protein or arginine restriction

Commonly Confused Codes