E71.41

HCC Category Mapping

What This Code Means

A rare genetic condition where the body cannot produce enough carnitine, a substance essential for converting fats into energy, due to inherited genetic mutations.

Coding Tips

• •Document whether this is systemic carnitine deficiency or muscle-specific carnitine deficiency
• •Note any cardiac involvement (cardiomyopathy) or muscle weakness that may require additional codes

Clinical Significance

Primary carnitine deficiency (systemic carnitine deficiency) is caused by mutations in the SLC22A5 gene encoding the carnitine transporter OCTN2, resulting in excessive urinary carnitine loss and critically low plasma carnitine levels. Without treatment, patients face risk of hypoketotic hypoglycemia, cardiomyopathy, and sudden death. Lifelong oral carnitine supplementation is highly effective and dramatically improves outcomes.

Documentation Requirements

• ✓Document plasma carnitine levels (typically very low free carnitine <5 micromol/L), genetic testing confirming SLC22A5 mutations, echocardiogram findings, clinical presentation, and carnitine supplementation dosage and response.
• ✓Record whether identified through newborn screening or clinical presentation.

Commonly Confused Codes