ICD-10 Code E71.448 – Other secondary carnitine deficiency (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E71.448 – Other secondary carnitine deficiency
What it is
This code identifies a secondary carnitine deficiency, meaning low carnitine levels caused by another condition, medication, or nutritional issue rather than a primary inherited disorder. Use it when the record specifies an “other” secondary form.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings may include muscle weakness, fatigue, hypoglycemia, or poor growth, but you should code only when the diagnosis is clearly stated.
When to use this code
Use E71.448 when the provider documents secondary carnitine deficiency and does not name a more specific cause or subtype. It also fits cases described as “other secondary carnitine deficiency” in the assessment or problem list. Confirm that the deficiency is secondary, not primary or unspecified.
Do not use for
Do not use this code for primary carnitine deficiency or for carnitine deficiency that is not documented as secondary. If the chart only mentions low carnitine without a diagnosis, check documentation.
Coding tip
Look for the word “secondary” in the assessment, because that wording drives selection of E71.448.