ICD-10 Code E43 – Unspecified severe protein-calorie malnutrition (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E43 – Unspecified severe protein-calorie malnutrition
What it is
E43 identifies severe protein-calorie malnutrition when the record does not specify the exact cause or type. Use it for marked undernutrition with significant protein and calorie deficiency.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include severe weight loss, muscle wasting, poor intake, and functional decline, but you should code only when the provider documents severe malnutrition.
When to use this code
Use E43 when the clinician documents severe protein-calorie malnutrition and no more specific malnutrition code is supported. It is appropriate when the record confirms severity but does not identify whether the condition is marasmic, kwashiorkor, or another specified form.
If the note only says “malnutrition” or “poor nutrition,” check documentation before assigning E43. You should also confirm that the severity is clearly supported in the assessment, discharge summary, or problem list.
Do not use for
Do not use E43 for mild or moderate malnutrition, or when the documentation supports a more specific malnutrition code. Do not assume severe malnutrition from low weight alone.
Coding tip
Query the provider when severity or type is unclear, because E43 requires documented severe protein-calorie malnutrition.