Protein-Calorie Malnutrition HCC Coding Guide
Complete HCC coding guide for Protein-Calorie Malnutrition (E40-E46) including ICD-10 to HCC mapping, V28 RAF weights, severity documentation, and BMI coding.
Quick Facts
HCC Categories
HCC 49 — Specified Nutritional Deficiencies and Disorders
RAF Weight Range
0.455
Community, non-dual, aged (V28)
Model
CMS-HCC V28 (PY2026 — 100% phase-in)
9 ICD-10 codes map to payment HCCs
Overview
Protein-calorie malnutrition (PCM) is a high-impact HCC condition that significantly affects risk adjustment scores. Under CMS-HCC V28, severe malnutrition maps to HCC 21 (paired with severe illness) while other degrees map to HCC 49 (Specified Nutritional Deficiencies and Disorders). PCM is diagnosed based on clinical criteria including unintentional weight loss, inadequate nutritional intake, muscle wasting, and laboratory markers such as albumin and prealbumin levels. The American Society for Parenteral and Enteral Nutrition (ASPEN) consensus criteria define malnutrition severity. Accurate coding requires provider documentation of the specific type and severity of malnutrition — coders cannot infer malnutrition from BMI or lab values alone.
ICD-10 to HCC Mapping
| ICD-10 Code | Description | Billable | HCC Mapping |
|---|---|---|---|
| E43 | Unspecified severe protein-calorie malnutrition | Yes | HCC 49 |
| E44.0 | Moderate protein-calorie malnutrition | Yes | HCC 49 |
| E44.1 | Mild protein-calorie malnutrition | Yes | HCC 49 |
| E46 | Unspecified protein-calorie malnutrition | Yes | HCC 49 |
| E40 | Kwashiorkor | Yes | HCC 49 |
| E41 | Nutritional marasmus | Yes | HCC 49 |
| E42 | Marasmic kwashiorkor | Yes | HCC 49 |
| E45 | Retarded development following protein-calorie malnutrition | Yes | HCC 49 |
| R64 | Cachexia | Yes | HCC 49 |
| R63.4 | Abnormal weight loss | Yes | No HCC (supporting) |
RAF weights are community, non-dual, aged base coefficients from the CMS-HCC V28 model (PY2026). Verify against the latest CMS rate announcement for payment calculations.
Documentation Tips
The provider must explicitly diagnose 'malnutrition' or 'protein-calorie malnutrition' — coders cannot assign these codes based on lab values or BMI alone.
Document the severity: mild, moderate, or severe based on ASPEN or Academy of Nutrition and Dietetics criteria.
Record the clinical indicators: unintentional weight loss (percentage and timeframe), reduced oral intake, muscle wasting, subcutaneous fat loss.
Include supporting lab values: albumin, prealbumin, transferrin — but remember these alone do not establish the diagnosis.
Document the treatment plan: nutritional supplementation, dietary modifications, enteral/parenteral nutrition orders.
Registered dietitian assessments can support the diagnosis, but the attending provider must document and confirm the malnutrition diagnosis.
Re-evaluate and re-document malnutrition status at subsequent encounters to demonstrate ongoing assessment and treatment.
Common Coding Mistakes
Assigning a malnutrition code based solely on low albumin or BMI without a provider diagnosis of malnutrition.
Using E46 (unspecified PCM) when the provider has documented the severity — always code to the most specific severity level.
Not recapturing malnutrition at follow-up encounters when the condition persists — it must be re-documented and coded each visit.
Failing to have the attending physician co-sign or confirm a dietitian's malnutrition assessment, which is required for coding purposes.
Coding malnutrition for patients who are simply underweight without documented clinical malnutrition criteria.
V24 to V28 Changes
V28 maps protein-calorie malnutrition to HCC 49 (Specified Nutritional Deficiencies and Disorders), a new category that consolidates nutritional conditions. Under V24, PCM mapped to HCC 21 (Protein-Calorie Malnutrition) with a very high RAF weight. The V28 recalibration significantly adjusted the RAF weight for malnutrition, though it remains a meaningful HCC. V28 placed greater emphasis on documentation quality and clinical specificity for malnutrition coding, reflecting CMS scrutiny of risk adjustment data validation (RADV) audits targeting malnutrition codes.
Related Conditions
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