E71.39

HCC Category Mapping

What This Code Means

A group of rare inherited metabolic disorders affecting how the body processes and uses fatty acids, not fitting into other more specific fatty acid metabolism categories.

Coding Tips

• •This is a residual code; use only when the specific fatty acid metabolism disorder is not identified or documented
• •Request clarification from the provider on the specific metabolic defect to potentially assign a more specific code

Clinical Significance

This residual code captures fatty acid metabolism disorders not classified elsewhere, including rare conditions affecting fatty acid synthesis, elongation, or desaturation pathways rather than the more common oxidation defects. These disorders can present with diverse clinical features including neurological dysfunction, skin abnormalities, and growth impairment. Accurate diagnosis often requires specialized metabolic testing.

Documentation Requirements

• ✓Document the specific fatty acid metabolism disorder identified, biochemical testing results, genetic testing if performed, clinical manifestations, and reason why a more specific code cannot be assigned.
• ✓Record any associated complications requiring additional codes.

Commonly Confused Codes