Billing codes · ICD-10-CM code

Malnutrition codes E43, E44.0, E44.1 and E46 for dietitians

By Javier Alvarez · Updated September 29, 2026 · 5 min read

Malnutrition is where a dietitian's assessment matters most and where coding rules trip up the most careful notes. You can find every characteristic, document them precisely, and still not be the one whose statement puts the code on the claim. Here's how the codes work, what the documentation standard is, and how to get from your findings to a billable diagnosis.

The malnutrition codes

Section E40-E46 of ICD-10-CM covers malnutrition. The codes a US outpatient dietitian will actually see:

The others are rare in US practice: E40 kwashiorkor, E41 nutritional marasmus, E42 marasmic kwashiorkor, and E45 retarded development following protein-calorie malnutrition (nutritional stunting). Sequelae of past malnutrition are E64.0.

Notes that matter:

• Section Excludes1: intestinal malabsorption (K90.-) and sequelae of protein-calorie malnutrition (E64.0).
• Section Excludes2: nutritional anemias (D50-D53) and starvation (T73.0). Those can be coded alongside when documented.
• E46 Excludes1: nutritional deficiency NOS (E63.9). "Nutritional deficiency" and "malnutrition" aren't interchangeable.
• Pregnancy: O99.2 excludes malnutrition, which goes to O25.1- (malnutrition in pregnancy, by trimester).

No code in E40-E46 changed in the FY2027 update effective October 1, 2026.

The documentation standard: Academy/ASPEN

ICD-10-CM doesn't define malnutrition. The criteria US dietitians use most come from the 2012 consensus statement of the Academy of Nutrition and Dietetics and the American Society for Parenteral and Enteral Nutrition (White et al., J Acad Nutr Diet 2012). It recommends identifying at least two of six characteristics:

1. Insufficient energy intake
2. Weight loss
3. Loss of muscle mass
4. Loss of subcutaneous fat
5. Localized or generalized fluid accumulation (which may mask weight loss)
6. Diminished functional status, measured by hand grip strength

Each is graded for severe or non-severe (moderate) malnutrition, in one of three contexts: acute illness or injury, chronic illness (lasting 3 months or longer), or social and environmental circumstances. For the two contexts most common in outpatient practice, the energy intake and weight loss thresholds are:

The consensus also says to measure height and weight rather than estimate, and that albumin and prealbumin aren't defining characteristics. The full table, including acute-illness thresholds and physical exam findings, is in the source. For children, a separate Academy/ASPEN pediatric consensus uses different indicators.

Who puts the code on the claim

Two guidelines decide this:

• Section I.A.19: code assignment is based on the provider's diagnostic statement that the condition exists, not on clinical criteria.
• Section I.B.14 lists the few things other clinicians may document for coding, such as BMI (with the dietitian as the example). Malnutrition isn't on that list.

So the workflow is: you assess and document the characteristics and severity, communicate them to the provider, and the provider documents the diagnosis. Then E43, E44.0, E44.1 or E46 can go on the claim. If the provider documents malnutrition without severity, that's E46. If your findings support a severity, ask the provider to state it.

Outpatient rules add one more point (Section IV.H): "at risk for malnutrition" or "possible malnutrition" isn't coded as malnutrition. Code what's established, such as R63.4 abnormal weight loss or R63.6 underweight.

Coverage

• Medicare MNT covers diabetes and renal disease only (NCD 180.1), so malnutrition alone doesn't qualify. It can be a secondary diagnosis on a diabetes or CKD claim.
• Commercial plans vary. Aetna's CPB 0049 covers nutritional counseling for chronic conditions "in which dietary adjustment has a therapeutic role," but malnutrition codes aren't on its listed diagnoses. Verify whether E43-E46 are accepted for 97802/97803.
• Medicaid rules differ by state; pediatric and home-health programs often have their own nutrition benefits.

Example claim lines (invented)

What the note should show

• Context (acute illness, chronic illness or social circumstances) and the time frame.
• At least two characteristics, with numbers: intake as a percent of estimated needs and for how long; measured weight, usual weight and percent change over time; muscle and fat findings by site; fluid status; grip strength if measured.
• Your severity conclusion, your PES statement, and the date you communicated it to the provider.
• The provider's diagnosis once documented, plus the plan and face-to-face minutes.

PES statement examples and the ADIME note example show the format; charting for medical necessity covers what reviewers look for.

Denials and fixes

For all the diagnosis codes on nutrition claims, see the ICD-10 codes for dietitians reference.