Crystal's Coder Hub🧬 ICD-10 CM E44.0 — Moderate Protein-Calorie Malnutrition
Billable Code Confirmed
[ICD-10-CM] E44.0 is a valid, billable 5-character ICD-10-CM code for FY2026 (effective October 1, 2025 through September 30, 2026).1 The code is structured as: E (Chapter 4 — Endocrine, nutritional and metabolic diseases) → 44 (protein-calorie malnutrition of moderate and mild degree) → .0 (moderate severity specifier). All five characters are required; no additional characters exist below this level.
Non-Billable Parent Codes — Never Submit These
- ❌
E44— 3-character header — does not specify severity (moderate vs. mild); non-billableAlways submit E44.0 (all 5 characters) when moderate protein-calorie malnutrition is documented by the provider with supporting clinical criteria.
Clinical Context: Severity Specificity Drives DRG Impact
ICD-10-CM E44.0 captures moderate-severity protein-calorie malnutrition — the critical middle tier between mild (E44.1) and severe (E43). As a secondary diagnosis, E44.0 functions as a CC, whereas E43 (severe) is an MCC. The distinction between moderate and severe malnutrition must be supported by documented ASPEN or GLIM clinical criteria and an explicit provider severity statement. CDI query is often warranted when documentation is vague or severity is ambiguous.2,3
Code Classification
ICD-10-CM Diagnosis Code — wRVU, assistant payable, and global period fields are not applicable to diagnosis codes. For associated inpatient procedures, refer to the ICD-10-PCS Crosswalk section below. For profee billing, refer to the Commonly Associated CPT Codes section.
🔍 Code Description
ICD-10-CM E44.0 classifies moderate protein-calorie malnutrition — a clinical state in which intake of both protein and energy is insufficient to meet metabolic demands, resulting in measurable phenotypic changes including weight loss, reduced muscle mass, and reduced fat stores, but not yet meeting criteria for severe malnutrition.2
The condition is diagnosed using validated clinical frameworks: the ASPEN/AND consensus criteria (requiring at least two of the following — insufficient energy intake, weight loss, loss of muscle mass, loss of subcutaneous fat, fluid accumulation, reduced grip strength) or the GLIM (Global Leadership Initiative on Malnutrition) criteria, which classifies this severity level as Stage 1 (Moderate).3,4 Etiologically, malnutrition in inpatient settings most commonly arises in the context of chronic disease, acute illness with hypermetabolism, malabsorption, dysphagia, cancer, or social determinants of health.2
🌳 Code Tree / Hierarchy
E40-E46 Malnutrition ❌ Non-billable (block)
│
├── E40 Kwashiorkor ✅ Billable
├── E41 Nutritional marasmus ✅ Billable
├── E42 Marasmic kwashiorkor ✅ Billable
├── E43 Unspecified severe protein-calorie malnutrition ✅ Billable — MCC
│
├── E44 Protein-calorie malnutrition of moderate and mild degree ❌ Non-billable
│ │
│ ├── E44.0 Moderate protein-calorie malnutrition ◀ THIS CODE ✅ Billable — CC
│ └── E44.1 Mild protein-calorie malnutrition ✅ Billable — CC
│
├── E45 Retarded development following protein-calorie malnutrition ✅ Billable
└── E46 Unspecified protein-calorie malnutrition ✅ Billable — CC
The Severity Ladder Has Real Money Attached
E44.0 (moderate) and E44.1 (mild) both function as a CC when coded as secondary diagnoses, while E43 (severe) is an MCC. If documentation supports severe malnutrition per ASPEN/GLIM criteria, query the provider — capturing E43 instead of E44.0 can significantly increase DRG weight and reimbursement. Never upcode without documentation, but never under-query either.5
✅ Includes
The following clinical terms and scenarios map to E44.0 when documented:
- Moderate protein-energy malnutrition (per ASPEN or GLIM criteria)
- GLIM Stage 1 (moderate) malnutrition
- Protein-calorie malnutrition, moderate severity, with documented clinical indicators
- Moderate malnutrition in the setting of chronic disease, cancer, GI illness, or post-surgical state
- “Malnourished” or “malnourishment” documented with moderate severity (per AHA Coding Clinic 1Q2020)6
❌ Excludes
Excludes 1 — Cannot Be Coded Simultaneously with E44.0
(These notes apply at the section level E40-E46)
| Code | Description | Note |
|---|---|---|
| K90.- | Intestinal malabsorption | When malnutrition is the direct consequence of intestinal malabsorption, code the K90 malabsorption condition; do not code E44.0 as the primary malnutrition code alongside it in this context. |
| E64.0 | Sequelae of protein-calorie malnutrition | Active current malnutrition (E44.0) and its sequelae (E64.0) are mutually exclusive — use E64.0 only when the malnutrition itself is resolved but late effects persist. |
Excludes 1 Violation Risk
A coder might attempt to report both E44.0 and E64.0 when a patient with a history of malnutrition is admitted with an acute nutritional issue. If active malnutrition is currently present and documented, use E44.0 — not E64.0. Reserve E64.0 for residual/late effects only, when active malnutrition is no longer present.
Excludes 2 — May Be Coded in Addition if Separately Present
| Code | Description | Note |
|---|---|---|
| D50-D53 | Nutritional anemias | Iron-deficiency anemia, folate deficiency, etc. may coexist with malnutrition and should be coded separately if documented. |
| T73.0 | Starvation | A distinct concept from protein-calorie malnutrition; may be separately present and codeable. |
📋 Clinical Overview
Severity Spectrum: Distinguishing Mild, Moderate, and Severe Malnutrition
Selecting the correct severity code requires understanding the clinical thresholds that differentiate E44.1 (mild), E44.0 (moderate), and E43 (severe). The table below summarizes key ASPEN/GLIM indicators by severity tier.2,3,4
| Feature | E44.0 — Moderate | E44.1 — Mild | E43 — Severe |
|---|---|---|---|
| Energy intake | <75% of estimated needs >7 days | <75% of estimated needs >7 days (less duration or degree) | <50% of estimated needs >5 days (acute) or ongoing deficiency |
| Weight loss | 5-10% in 6 months; or 2-5% in 1 month | <5% in 6 months | >10% in 6 months; or >5% in 1 month |
| BMI range (GLIM) | 17.0-18.4 (adult <70 yrs) | 18.5-20 with weight loss | <17.0 (adult <70 yrs) |
| Muscle mass loss | Mild-moderate; detectable on exam | Minimal | Severe, visible wasting |
| Fat stores | Mild-moderate depletion | Minimal depletion | Severe depletion |
| DRG impact (secondary) | CC | CC | MCC |
| GLIM Stage | Stage 1 (Moderate) | Not distinctly defined — typically pre-Stage 1 | Stage 2 (Severe) |
CDI Query Trigger — Severity Not Specified
When documentation states “malnutrition” without severity, or uses vague language such as “poor nutritional status,” “cachectic appearance,” or “nutritional deficiency,” a CDI query is required before coding. Ask the provider: “Based on the documented clinical indicators (weight loss, muscle wasting, energy intake deficit), does this patient meet criteria for mild, moderate, or severe protein-calorie malnutrition per ASPEN or GLIM criteria?” The answer drives the code selection and the CC vs. MCC determination.5
Manifestations & Symptom Burden
Moderate protein-calorie malnutrition produces a recognizable clinical picture that should be reflected in the medical record to support code assignment:
- Muscle wasting: Reduced grip strength, difficulty ambulating, sarcopenia on imaging or physical exam
- Weight loss: Documented unintentional weight loss meeting moderate thresholds (see table above)
- Fatigue and functional decline: Reduced activity tolerance, fall risk, delayed wound healing
- Hypoalbuminemia: While albumin is no longer a standalone diagnostic criterion for malnutrition under ASPEN/GLIM (it reflects inflammation, not nutritional status), low albumin may support the overall clinical picture when documented alongside other phenotypic criteria2
- Immune compromise: Increased infection risk; relevant in surgical and oncologic patients
Coding Manifestations
Always code the documented comorbidities contributing to or resulting from malnutrition to capture full patient complexity. Examples include:
- Z68.- — BMI, if documented (code additionally per ICD-10-CM guidelines)
- R64 — Cachexia (when documented separately by provider; per Coding Clinic 3Q2006, “cachectic” = cachexia)6
💰 HCC Risk Adjustment (CMS-HCC v28)
| Field | Detail |
|---|---|
| CMS-HCC Model Version | v28 (2024-2025 Implementation) |
| HCC Assignment | ❌ Not HCC-Mapped under v28 |
| HCC Category | N/A — removed from CMS-HCC v28 |
| RAF Coefficient | N/A |
E44.0 does not map to an HCC under CMS-HCC v28. CMS removed protein-calorie malnutrition from the risk-adjustment model due to identified discretionary coding variation — MA plans were coding this condition at significantly higher rates than fee-for-service, triggering a clinical review and subsequent removal.7 Note: this code previously mapped to HCC 21 (Protein-Calorie Malnutrition) under the v24 model. Under HHS-HCC (ACA marketplace), impact may still apply — verify by payer.
No HCC Value Under MA v28 — But Still Clinically and DRG-Critical
E44.0 does not generate a RAF score for Medicare Advantage under v28. However, accurate documentation and capture remains essential for DRG accuracy, CDI program integrity, quality metrics, and care coordination. Do not skip querying or coding malnutrition simply because HCC value was removed — the CC impact on DRG reimbursement remains fully intact.
🏥 MS-DRG Assignment
MDC 10 — Endocrine, Nutritional and Metabolic Diseases and Disorders
| DRG | Title | Est. Relative Weight* |
|---|---|---|
| DRG 640 | Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC | ~1.2-1.5 |
| DRG 641 | Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC | ~0.7-1.0 |
Approximate. Verify against IPPS FY2026 Final Rule tables. E44.0 as principal diagnosis groups to DRG 640 or 641 — there is no separate CC-split DRG at this level; the MCC/no-MCC split is driven by secondary diagnoses.
Sequencing and CC Function
When E44.0 is the principal diagnosis (reason for admission), it groups to MDC 10 (DRG 640 or 641). When coded as a secondary diagnosis, E44.0 functions as a CC and will upgrade a split-DRG pairing for the principal diagnosis — for example, converting a “without CC/MCC” DRG to a “with CC” DRG with higher relative weight. If documentation supports severe malnutrition (E43), that code functions as an MCC — the upgrade is more significant. Query the provider when severity is ambiguous. Never sequence malnutrition as principal unless it was the reason for admission.5,8
🔗 Related ICD-10-CM Codes
Severity Spectrum — Malnutrition Codes
| Code | Description |
|---|---|
| E44.0 | Moderate protein-calorie malnutrition ← This Code |
| E44.1 | Mild protein-calorie malnutrition |
| E43 | Unspecified severe protein-calorie malnutrition — MCC |
| E46 | Unspecified protein-calorie malnutrition (use when severity not documented) |
Specific Named Severe Forms
| Code | Description |
|---|---|
| E40 | Kwashiorkor (severe protein deficiency with edema) |
| E41 | Nutritional marasmus (severe caloric deficiency, usually with wasting) |
| E42 | Marasmic kwashiorkor (combined severe form) |
Associated and Sequela Codes
| Code | Description |
|---|---|
| E45 | Retarded development following protein-calorie malnutrition |
| E64.0 | Sequelae of protein-calorie malnutrition (late effects; malnutrition resolved) |
| R64 | Cachexia |
| Z68.- | BMI — code additionally when documented |
🛠️ Commonly Associated CPT Codes (General Medicine / Inpatient Profee)
Inpatient Profee Setting Context
In the inpatient profee setting, malnutrition is most commonly encountered as a secondary diagnosis impacting MDM complexity for E/M coding, or as the focus of a nutrition consult. Registered dietitian services are billed separately under HCPCS. The following CPT codes are commonly associated with patients carrying an E44.0 diagnosis.
| CPT Code | Description | Profee Coding Notes |
|---|---|---|
| 99221-99223 | Initial hospital inpatient E/M (low to high complexity) | Malnutrition increases MDM complexity; document data reviewed (nutrition consult, labs) and risk (moderate to high with comorbidities) to support 99222-99223 |
| 99231-99233 | Subsequent hospital inpatient E/M | E44.0 as active problem supports 99232-99233 when monitored daily with documented assessment and plan |
| 43246 | EGD with placement of percutaneous gastrostomy tube (PEG) | Common in patients with dysphagia-related malnutrition; report with E44.0 as supporting diagnosis |
| 43752 | Nasogastric or orogastric tube placement, requiring physician skill | Enteral access for nutritional support in moderate malnutrition |
| 90837 | Psychotherapy (60 min) | When malnutrition is linked to eating disorder or psychiatric etiology; coordinate with behavioral health coding |
NCCI Bundling Considerations
- Initial hospital E/M (99221-99223) billed on the same date as a procedure (e.g., PEG placement 43246): The E/M is typically bundled unless a separately identifiable E/M service is documented. Append Modifier -25 to the E/M when it is a distinct, separately documentable service performed on the same day.
🔬 ICD-10-PCS Crosswalk (Inpatient Procedures)
When E44.0 is an inpatient diagnosis, these PCS codes are relevant for associated inpatient procedures addressing nutritional support.
| PCS Section | Body System | Root Operation | Clinical Application |
|---|---|---|---|
| 3 — Administration | E — Physiological Systems/Anatomical Regions | 0 — Introduction | Peripheral parenteral nutrition (PPN): 3E033GC — Introduction of Other Therapeutic Substance into Peripheral Vein, Percutaneous. |
| 3 — Administration | E — Physiological Systems/Anatomical Regions | 0 — Introduction | Total parenteral nutrition (TPN) via central line: 3E04305 — Introduction of Other Nutritional Substance into Central Vein, Percutaneous. |
| 0 — Medical and Surgical | D — Gastrointestinal System | H — Insertion | PEG tube insertion for enteral nutrition: 0DH63UZ — Insertion of Feeding Device into Stomach, Percutaneous Endoscopic Approach. |
| 3 — Administration | G — Upper GI | 0 — Introduction | Nasogastric tube feedings: 3E0G76Z — Introduction of Nutritional Substance via Natural/Artificial Opening. |
💊 Coding Scenarios and Examples
Scenario 1 — Inpatient: Moderate Malnutrition as Secondary Diagnosis Impacting DRG
Clinical Vignette: A 74-year-old male with a history of stage III colon cancer and recent right hemicolectomy is admitted for a post-operative ileus. Nutrition is consulted on day 2; the dietitian documents a 9% unintentional weight loss over the past 3 months, reduced caloric intake to approximately 60% of estimated needs for the past 10 days, and moderate loss of muscle mass on physical exam. The attending physician reviews the consult and documents in the progress note: “Patient meets criteria for moderate protein-calorie malnutrition per ASPEN criteria; initiating supplemental enteral nutrition via nasogastric tube.”
Principal Diagnosis:
- K56.7 — Ileus, unspecified (reason for admission)
Secondary Diagnoses:
- E44.0 — Moderate protein-calorie malnutrition (CC — upgrades DRG weight)
- Z85.038 — Personal history of malignant neoplasm of large intestine (relevant history)
- Z68.1 — BMI 17.9 (coded additionally per guideline)
MS-DRG Assignment: The ileus principal diagnosis groups to MDC 06. E44.0 as a secondary diagnosis functions as a CC, upgrading the DRG from the “without CC/MCC” tier to the “with CC” tier — a meaningful reimbursement improvement. If documentation had supported severe malnutrition (E43), an MCC-level upgrade would apply.
Scenario 2 — Inpatient: Moderate Malnutrition as Principal Diagnosis
Clinical Vignette: A 68-year-old female with Parkinson’s disease and progressive dysphagia is admitted specifically for evaluation and management of significant weight loss and nutritional decline. She has lost 8% of her body weight over 4 months and is estimated to consume less than 60% of her estimated caloric needs daily. Physical exam reveals moderate temporal wasting and reduced grip strength. The attending documents: “Moderate protein-calorie malnutrition secondary to dysphagia in the setting of advanced Parkinson’s disease; recommending PEG tube placement for enteral access.”
Principal Diagnosis:
- E44.0 — Moderate protein-calorie malnutrition (reason for admission — nutrition management is the primary focus)
Secondary Diagnoses:
- G20.C1 — Parkinson’s disease with dysautonomia, without stated fluctuations (underlying etiology)
- R13.19 — Other dysphagia (contributing cause)
- Z68.17 — BMI 17.7 (coded additionally)
MS-DRG Assignment: E44.0 as principal groups to MDC 10 → DRG 640 (with MCC, if a secondary MCC is present) or DRG 641 (without MCC). The Parkinson’s code does not function as MCC here. DRG 641 is the likely grouping unless another MCC secondary diagnosis is documented.
Scenario 3 — CDI Query: Severity Not Documented
Clinical Vignette: A 58-year-old male with active Crohn’s disease is admitted for a flare with significant abdominal pain and diarrhea. A nutrition consult note states: “Patient is malnourished. 7% weight loss over 3 months. Poor oral intake. Initiated elemental formula.” The attending’s progress notes document “malnutrition” and “nutritional deficiency” without specifying severity. Coder can identify objective indicators in the chart but the attending has not assigned a severity level.
Action / Outcome: Documentation states “malnutrition” without severity — E46 (unspecified) would be the only defensible code at this point. However, the nutrition consult documents clinical indicators consistent with moderate severity (7% weight loss in 3 months, reduced intake). A CDI query is appropriate before coding.
Query Response: Provider updates documentation: “Patient meets criteria for moderate protein-calorie malnutrition per ASPEN consensus criteria, based on 7% weight loss over 3 months and estimated energy intake less than 70% of needs for >7 days, in the context of active Crohn’s disease.”
Corrected ICD-10-CM Coding:
- E44.0 — Moderate protein-calorie malnutrition (now supported by explicit provider severity statement)
- K50.10 — Crohn’s disease of large intestine without complications (underlying disease)
⚠️ Coding Pitfalls and Tips
| Pitfall or Tip | |
|---|---|
| ❌ | Coding E46 (unspecified) when severity indicators exist. When the medical record contains ASPEN/GLIM criteria supporting moderate or severe malnutrition but the provider has not explicitly stated severity, query first — do not default to E46 simply because it’s “safer.” Unspecified codes miss the CC impact and understate patient complexity. |
| ❌ | Confusing E44.0 with E43 (severe). Moderate malnutrition is a CC; severe is an MCC. Upcoding E44.0 to E43 without supporting documentation is a compliance risk and audit target. Conversely, downcoding E43 to E44.0 when severe criteria are met leaves reimbursement on the table. Both are wrong. |
| ❌ | Coding “malnourished” or “malnourishment” without a query. These terms are not in the ICD-10-CM Alphabetic Index but per AHA Coding Clinic (1Q2020) should be coded as malnutrition — however, a query for severity is still required if not specified.6 |
| ✅ | Always query for severity when documentation is vague. Any documentation of “poor nutrition,” “nutritional deficiency,” “cachexia,” or “malnutrition” without a severity qualifier warrants a CDI query. The CC vs. MCC outcome is worth the query every time. |
| ✅ | Code BMI additionally when documented. ICD-10-CM guidelines direct coders to assign a BMI code (Z68.-) as an additional code when BMI is documented. In malnutrition patients, BMI often falls in the underweight range and supports the clinical picture. |
| ✅ | Understand that albumin is not a standalone criterion. Under current ASPEN and GLIM frameworks, hypoalbuminemia reflects inflammation, not nutritional status. Payers and auditors are aware of this. Malnutrition coding must be supported by phenotypic criteria (weight loss, muscle loss, fat loss, reduced intake), not albumin alone.2,4 |
📚 Sources
- CMS/NCHS. ICD-10-CM Official Guidelines for Coding and Reporting, FY2026. Available at: cms.gov.
- White JV, Guenter P, Jensen G, et al. (2012). Consensus statement: Academy of Nutrition and Dietetics/ASPEN characteristics recommended for the identification and documentation of adult malnutrition (undernutrition). Journal of the Academy of Nutrition and Dietetics, 112(5), 730-738.
- Cederholm T, et al. (2019). GLIM criteria for the diagnosis of malnutrition — a consensus report from the global clinical nutrition community. Clinical Nutrition, 38(1), 1-9.
- LA Care Health Plan. Clinical Validation Guideline: Malnutrition. February 2025. Available at: lacare.org.
- ACDIS. Q&A: Documenting and Coding Severe Malnutrition. March 2022. Available at: acdis.org.
- AHA Coding Clinic. First Quarter 2020, p. 6 (malnourished/malnourishment = malnutrition); Third Quarter 2006, p. 15 (cachectic = cachexia).
- CMS. 2025 Advance Notice — CMS-HCC Risk Adjustment Model v28: Removal of Protein-Calorie Malnutrition, Angina, and Atherosclerosis HCCs. MedPAC Comment, March 2024. Available at: medpac.gov.
- CMS. IPPS Final Rule FY2026 — MS-DRG Definitions Manual v43.0. MDC 10 logic tables. Available at: cms.gov.
Sources 1-8 are referenced in-note via superscripts. Verify DRG relative weights against the IPPS FY2026 Final Rule tables; approximate figures are provided for orientation only.