Other secondary carnitine deficiency

This code represents a metabolic disorder where the body cannot properly utilize or produce carnitine, leading to its deficiency as a secondary consequence of another underlying condition. Carnitine is crucial for transporting fatty acids into mitochondria for energy production, so its deficiency can impair energy metabolism, particularly in muscles and the heart. This specific code is used for secondary carnitine deficiencies that do not fit into more specific categories.

Use this code when documentation clearly indicates a secondary carnitine deficiency that is not due to a specific metabolic disorder with its own unique ICD-10-CM code. This often arises in patients with chronic kidney disease, certain liver diseases, or those on specific medications that interfere with carnitine metabolism. Supporting documentation should include laboratory findings confirming low carnitine levels and a clearly identified underlying cause.

• Always sequence the underlying condition causing the secondary carnitine deficiency first, as this code is always secondary.
• Distinguish from primary carnitine deficiencies (E71.41-) which are genetic defects in carnitine synthesis or transport.
• Avoid using this code if a more specific secondary carnitine deficiency code (e.g., E71.440 for iatrogenic, E71.441 for renal) is available and supported by documentation.