ICD-10-CM 2027
ICD-10 code for malignant malnutrition
From the official ICD-10-CM alphabetic index entry “Malnutrition › malignant”. Page updated September 29, 2026.
About coding malignant malnutrition
The ICD-10-CM code for malignant malnutrition is E40 (Kwashiorkor).
Don't report E40 together with the conditions in its Excludes1 note: marasmic kwashiorkor (E42).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 640 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC, relative weight 1.3395) and DRG 641 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC, relative weight 0.7865), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Don't confuse with (Excludes1 for E40)
- marasmic kwashiorkor (E42)
Common questions about malignant malnutrition ICD-10 codes
What is the ICD-10 code for malignant malnutrition?
- E40 — Kwashiorkor.
Is E40 billable?
- Yes. E40 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E40 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E40 as a principal diagnosis.
Is E40 a CC or MCC?
- E40 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.