What is ICD-10 code E74.819?

E74.819 is the ICD-10-CM diagnosis code for Disorders of glucose transport, unspecified. A metabolic condition where the body has difficulty moving glucose into cells properly, but the specific type of transport problem is not identified. E74.819 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. E74.819 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. E74.819 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. E74.819 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does E74.819 map to under V28?

E74.819 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for E74.819?

E74.819 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for E74.819?

E74.819 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

What documentation supports E74.819?

This is a catch-all code; attempt to obtain more specific diagnosis documentation before coding Query the provider if additional testing results are available to specify the glucose transport defect E74.819 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

Can E74.819 be a primary diagnosis?

Yes. E74.819 carries no code-first instruction in the FY2026 tabular, so it can be the first-listed diagnosis when it is the condition chiefly responsible for the encounter and the note supports it, and it can also be reported as a secondary diagnosis. For risk adjustment the order does not matter; the V28 category is the same either way.

Which codes cannot be reported with E74.819?

The Excludes1 note that applies to E74.819 lists transitory endocrine and metabolic disorders specific to newborn (P70-P74); androgen insensitivity syndrome (E34.5-); congenital adrenal hyperplasia (E25.0); hemolytic anemias attributable to enzyme disorders (D55.-); and 6 more (see the notes on this page). An Excludes1 condition is not reported together with E74.819; report one or the other, unless the two conditions are unrelated, which the ICD-10-CM Official Guidelines (Section I.A.12.a) allow. The Excludes2 note lists Ehlers-Danlos syndromes (Q79.6-); those are separate conditions that may be reported together with E74.819 when both are documented.

2026 ICD-10-CM E74.819: Disorders of glucose transport

E74.819 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools

ICD-10-CM Code View

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Code lookupE74.819

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Metabolic disorders (E70-E88)

E74.819

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Disorders of glucose transport, unspecified

A metabolic condition where the body has difficulty moving glucose into cells properly, but the specific type of transport problem is not identified.

Buddy Insight

Disorders of glucose transport, unspecified, is used when a glucose transport disorder has been diagnosed but the specific transporter defect is not identified.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Context needed

HCC 028

Conditional HHS-HCC mapping: HCC 028 when age < 21. Select the member context before showing a coefficient reference. Metal level and model segment are required for coefficients; no single RAF is shown.

Coefficient needs member context

ESRD/PACE

Context needed

HCC 23

ESRD candidates: HCC 23 when age < 21 or age >= 21. ESRD mapping is separate from PACE. Dialysis, graft, age, and other member context determine the applicable coefficient.

Coefficient needs member context

RXHCC

Mapped

HCC 43

Pituitary, Adrenal Gland, and...

Code-level coefficient reference

Code Book Path

Official

E74.8Other specified disorders of carbohydrate metabolism E74.81Disorders of glucose transport, not elsewhere classified E74.819Disorders of glucose transport, unspecified

Inclusion Terms

Official

No inclusion terms are included in this display for E74.819. Check the code and parent instructions in the Code Book.

Excludes 2

Official

Ehlers-Danlos syndromes (Q79.6-)Inherited from E70-E88

Related Codes

Official

E74.810Glucose transporter protein type 1 deficiency E74.818Other disorders of glucose transport

Includes

Official

No Includes notes are included in this display for E74.819. Check the code and parent instructions in the Code Book.

Excludes 1

Official

transitory endocrine and metabolic disorders specific to newborn (P70-P74)Inherited from E00-E89, E70-E88, E74
androgen insensitivity syndrome (E34.5-)Inherited from E00-E89, E70-E88, E74
congenital adrenal hyperplasia (E25.0)Inherited from E00-E89, E70-E88, E74
hemolytic anemias attributable to enzyme disorders (D55.-)Inherited from E00-E89, E70-E88, E74
Marfan syndrome (Q87.4-)Inherited from E00-E89, E70-E88, E74
5-alpha-reductase deficiency (E29.1)Inherited from E00-E89, E70-E88, E74
diabetes mellitus (E08-E13)Inherited from E00-E89, E70-E88, E74
hypoglycemia NOS (E16.2)Inherited from E00-E89, E70-E88, E74
increased secretion of glucagon (E16.3)Inherited from E00-E89, E70-E88, E74
mucopolysaccharidosis (E76.0-E76.3)Inherited from E00-E89, E70-E88, E74

Code First

Official

No Code First sequencing instructions are included in this display for E74.819. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for E74.819. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for E74.819. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Provider diagnosis of a glucose transport disorder

Laboratory or clinical evidence suggesting a glucose transport defect

Documentation of why specific transporter identification is pending or not possible

Clinical manifestations prompting the diagnosis

MEAT Support

HCC Buddy guidance

Provider diagnosis of a glucose transport disorder

Laboratory or clinical evidence suggesting a glucose transport defect

Documentation of why specific transporter identification is pending or not possible

Clinical manifestations prompting the diagnosis

Audit Caution

HCC Buddy guidance

Using this code when GLUT1 deficiency or another specific glucose transport disorder has been confirmed

Not querying the provider for genetic testing results that could allow a more specific code

Confusing glucose transport disorders with insulin resistance or diabetes mellitus

Failing to update the code once diagnostic workup results are available

Common Mistakes

HCC Buddy guidance

E74.810 — Glucose transporter protein type 1 deficiency: use when GLUT1 is confirmed

E74.818 — Other disorders of glucose transport: use when a specific non-GLUT1 disorder is identified

E74.9 — Disorder of carbohydrate metabolism, unspecified: even less specific; E74.819 is preferred when glucose transport is implicated

E11.9 — Type 2 diabetes mellitus without complications: insulin resistance is not a glucose transport disorder

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is E74.819 an HCC code?

E74.819 is not in the CMS-HCC V28 or V24 community payment model. E74.819 has a separate mapping under the CMS-HCC ESRD model (HCC 23 (Other Significant Endocrine and Metabolic Disorders)) and the Part D RxHCC model (HCC 43 (Pituitary, Adrenal Gland, and Other Endocrine and Metabolic Disorders)); the applicable result needs member context. E74.819 also appears in the HHS-HCC commercial risk model (HCC 028 (HHS-HCC 028 child, RAF varies by metal level)), where the result depends on member context and is not a Medicare Advantage payment mapping.

Code: E74.819
Description: Disorders of glucose transport, unspecified
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

RxHCCHCC 43, Pituitary, Adrenal Gland, and Other Endocrine and Metabolic Disorders

Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work E74.819 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for E74.819

For E74.819, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Coder workflow notes

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What This Code Means

E74.819 is the ICD-10-CM diagnosis code for disorders of glucose transport, unspecified. A metabolic condition where the body has difficulty moving glucose into cells properly, but the specific type of transport problem is not identified. E74.819 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering metabolic disorders (e70-e88).

E74.819 has no mapping under the CMS-HCC V28 or V24 community payment models. E74.819 has a separate mapping under the CMS-HCC ESRD model (HCC 23 (Other Significant Endocrine and Metabolic Disorders)) and the Part D RxHCC model (HCC 43 (Pituitary, Adrenal Gland, and Other Endocrine and Metabolic Disorders)); the applicable result needs member context. E74.819 also appears in the HHS-HCC commercial risk model (HCC 028 (HHS-HCC 028 child, RAF varies by metal level)), where the result depends on member context and is not a Medicare Advantage payment mapping. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.

This is a catch-all code; attempt to obtain more specific diagnosis documentation before coding.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for E74.819 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This is a catch-all code; attempt to obtain more specific diagnosis documentation before coding
•Query the provider if additional testing results are available to specify the glucose transport defect

Clinical Significance

Disorders of glucose transport, unspecified, is used when a glucose transport disorder has been diagnosed but the specific transporter defect is not identified. This may occur during diagnostic workup before genetic testing results are available. Given the clinical importance of identifying the specific transporter involved for treatment planning, this code should prompt further investigation.

Documentation Requirements

✓Provider diagnosis of a glucose transport disorder
✓Laboratory or clinical evidence suggesting a glucose transport defect
✓Documentation of why specific transporter identification is pending or not possible
✓Clinical manifestations prompting the diagnosis
✓Plan for additional diagnostic workup including genetic testing

Commonly Confused Codes

•E74.810: Glucose transporter protein type 1 deficiency: use when GLUT1 is confirmed
•E74.818: Other disorders of glucose transport: use when a specific non-GLUT1 disorder is identified
•E74.9: Disorder of carbohydrate metabolism, unspecified: even less specific; E74.819 is preferred when glucose transport is implicated
•E11.9: Type 2 diabetes mellitus without complications: insulin resistance is not a glucose transport disorder

Child Codes

E74.810Glucose transporter protein type 1 deficiency

E74.818Other disorders of glucose transport

E74.819Disorders of glucose transport, unspecified

Code Hierarchy

└E74Other disorders of carbohydrate metabolism └E74.8Other specified disorders of carbohydrate metabolism └E74.81Disorders of glucose transport, not elsewhere classified └E74.819Disorders of glucose transport, unspecified

└E74.819Disorders of glucose transport, unspecified

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E74.819

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HCC Category Mapping

MEAT review for E74.819

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Clinical Significance

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Commonly Confused Codes

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E74.819 ICD-10-CM Code: Disorders of glucose transport, unspecified

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E74.819

Is E74.819 an HCC code?

HCC Category Mapping

MEAT review for E74.819

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What This Code Means

Coding Tips

Clinical Significance

Documentation Requirements

Commonly Confused Codes

Child Codes

Code Hierarchy

E74.819 code history

Also searched as

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