E72.52

HCC Category Mapping

What This Code Means

A rare metabolic disorder where the body cannot properly process trimethylamine, causing a characteristic fish-like body odor and potential neurological symptoms.

Coding Tips

• •Document the presence or absence of the characteristic odor to help confirm diagnosis
• •Note any associated neurological or psychiatric symptoms that may accompany this condition

Clinical Significance

Trimethylaminuria (fish odor syndrome) is a metabolic disorder where the body cannot convert trimethylamine to its odorless oxide form, resulting in a characteristic strong fishy body odor. While not life-threatening, it causes significant psychosocial burden, depression, and social isolation. Accurate coding supports appropriate risk adjustment for the ongoing management and psychological care these patients need.

Documentation Requirements

• ✓Provider diagnosis of trimethylaminuria
• ✓Urine trimethylamine testing showing elevated levels or abnormal trimethylamine-to-trimethylamine N-oxide ratio
• ✓Genetic testing for FMO3 gene mutations if available
• ✓Documentation of whether the condition is primary (genetic) or secondary (dietary/gut microbiome related)
• ✓Current management plan including dietary restrictions and any psychological support

Commonly Confused Codes