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E11.3491

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🧬ICD-10 CM E11.3491 - Type 2 diabetes mellitus with severe nonproliferative diabetic retinopathy without macular edema, right eye

Overview

ICD-10 CM E11.3491 is a specific combination code used to classify Type 2 diabetes mellitus complicated by severe nonproliferative diabetic retinopathy (NPDR) without macular edema, specifically localized to the right eye. This code captures the systemic disease, the specific ocular complication, the severity of the retinopathy (severe), the absence of edema, and the laterality in a single alphanumeric string.

Accurate coding of E11.3491 is critical for risk adjustment, severity of illness scoring, and ensuring appropriate reimbursement. It distinguishes the condition from moderate NPDR (E11.3391) and proliferative diabetic retinopathy (E11.3511), as well as differentiating cases with macular edema (E11.3411) from those without.

Code Breakdown

The structure of E11.3491 follows the ICD-10-CM taxonomy:

SegmentValueDescription
CategoryE11Type 2 diabetes mellitus
SubcategoryE11.3Type 2 diabetes mellitus with ophthalmic complications
ExtensionE11.34Type 2 diabetes mellitus with severe nonproliferative diabetic retinopathy
Further ExtensionE11.349Type 2 diabetes mellitus with severe nonproliferative diabetic retinopathy without macular edema
Laterality1Right eye

Laterality Specifics

  • 1: Right eye
  • 2: Left eye
  • 3: Bilateral
  • 9: Unspecified eye

Laterality Requirement

When documenting diabetic retinopathy, the specific eye affected must be documented. If bilateral, use E11.3493. If unspecified, use E11.3499, though unspecified codes should be avoided when clinical documentation supports specificity.

Coding Guidelines

Includes

  • Type 2 diabetes mellitus with severe NPDR.
  • Absence of macular edema associated with the retinopathy.
  • Diabetes mellitus NOS (if documented as Type 2).
  • Adult-onset diabetes (if documented as Type 2).
  • Ketosis-resistant diabetes (if documented as Type 2).
  • Severe nonproliferative retinopathy defined by the 4-2-1 rule (hemorrhages in 4 quadrants, venous beading in 2 quadrants, IRMA in 1 quadrant).

Excludes

  • Type 1 Diabetes: If the patient has Type 1 diabetes, codes from category E10 must be used (e.g., E10.3491).
  • Drug/Chemical Induced: If diabetes is caused by drugs or chemicals, use category E09.
  • Other Specified Diabetes: Use category E13 for other specified types.
  • Moderate Retinopathy: If the retinopathy is moderate, codes from the .33 series are required (e.g., E11.3391).
  • Proliferative Retinopathy: If the retinopathy is proliferative, codes from the .35 series are required (e.g., E11.3591).
  • Macular Edema: If macular edema is present, codes from the .341 series are required (e.g., E11.3411).

Use of Additional Codes

While E11.3491 is a combination code, additional codes may be required to fully capture the clinical picture:

  • Long-term insulin use: Z79.4 (if the patient uses insulin, even though it is Type 2).
  • Long-term use of oral hypoglycemic drugs: Z79.84.
  • Insulin pump status: Z99.1 (if applicable).
  • Body Mass Index (BMI): Z68.- (if documented).
  • Visual Impairment: If the patient has blindness or low vision due to the condition, add codes from H54.-.
  • Glaucoma: If diabetic glaucoma is present, code separately (e.g., H40.-).

Risk Adjustment (HCC)

Hierarchical Condition Category (HCC) status is critical for Medicare Advantage and ACA plans.

  • HCC Status: Yes CMS-HCC V28
  • HCC ID: 18 (Diabetes with Chronic Complications)
  • RAF Impact: This code contributes to the Risk Adjustment Factor (RAF) score. Diabetes with chronic complications (like severe retinopathy) carries a higher risk weight than uncomplicated diabetes.
  • Recapture: This condition must be documented and coded at least once per calendar year to maintain the HCC status for risk adjustment purposes.
  • Severity: Severe NPDR indicates higher disease burden than Moderate NPDR, potentially impacting care management stratification.

Inpatient Impact (MS-DRG)

In the inpatient setting, E11.3491 influences the Medicare Severity Diagnosis Related Group (MS-DRG) assignment through Complication/Comorbidity (CC) logic.

  • CC/MCC Status: CC (Complication/Comorbidity) CMS MS-DRG v42
  • Impact: The presence of this code may shift a DRG from a “without CC/MCC” tier to a “with CC” tier, increasing the relative weight and reimbursement for the stay.
  • POA Indicator: Present on Admission (POA) reporting is required for inpatient claims. If the retinopathy was present before admission, mark Y.

Code Tree

Chapter 4: Endocrine, Nutritional and Metabolic Diseases (E00-E89)
└── Diabetes mellitus (E08-E13)
    └── Type 2 diabetes mellitus (E11)
        └── Type 2 diabetes mellitus with ophthalmic complications (E11.3)
            └── Type 2 diabetes mellitus with severe nonproliferative diabetic retinopathy (E11.34)
                └── Type 2 diabetes mellitus with severe nonproliferative diabetic retinopathy without macular edema (E11.349)
                    └── E11.3491 (Right eye)
                    └── E11.3492 (Left eye)
                    └── E11.3493 (Bilateral)
                    └── E11.3499 (Unspecified eye)

Clinical Coding Examples

Example 1: Routine Retina Follow-up

Scenario: A patient with known Type 2 diabetes presents for a routine retina follow-up. Dilated exam reveals severe nonproliferative diabetic retinopathy without macular edema in the right eye. Left eye shows moderate NPDR without edema. Coding:

  • Primary: E11.3491 (Severe NPDR without ME, Right Eye)
  • Secondary: E11.3392 (Moderate NPDR without ME, Left Eye)
  • Note: Code the most severe manifestation as the primary diabetes code if applicable, or sequence based on reason for visit.

Example 2: Bilateral Involvement

Scenario: Patient has Type 2 diabetes. Exam shows severe NPDR without macular edema in both eyes. Coding:

Example 3: Development of Macular Edema

Scenario: Patient previously coded with E11.3491 returns. Exam now shows severe nonproliferative diabetic retinopathy with macular edema in the right eye. Coding:

  • Primary: E11.3411 (Type 2 diabetes with severe nonproliferative diabetic retinopathy with macular edema, right eye).
  • Note: The code changes to reflect the development of edema.

Example 4: Insulin Usage

Scenario: Patient with Type 2 diabetes coded as E11.3491 is on long-term insulin therapy. Coding:

  • Primary: E11.3491
  • Secondary: Z79.4 (Long term (current) use of insulin)

Revenue Cycle Considerations

  • wRVU: Not Applicable. ICD-10-CM codes do not have work Relative Value Units. wRVUs are assigned to CPT/HCPCS procedure codes.
  • Assistant Payable: Not Applicable. This attribute applies to surgical CPT codes.
  • Denial Risk: High if paired with incompatible procedure codes (e.g., anti-VEGF injection without documented macular edema).
  • Query Opportunity: If documentation states “Diabetic Retinopathy” without specifying “Nonproliferative” vs “Proliferative” or “Moderate” vs “Severe,” a clinical documentation improvement (CDI) query is recommended. Severe NPDR has specific clinical criteria (4-2-1 rule) that should be documented.
  • E11.3492: Type 2 diabetes mellitus with severe nonproliferative diabetic retinopathy without macular edema, left eye
  • E11.3493: Type 2 diabetes mellitus with severe nonproliferative diabetic retinopathy without macular edema, bilateral
  • E11.3411: Type 2 diabetes mellitus with severe nonproliferative diabetic retinopathy with macular edema, right eye
  • E11.3391: Type 2 diabetes mellitus with moderate nonproliferative diabetic retinopathy without macular edema, right eye
  • E11.3591: Type 2 diabetes mellitus with proliferative diabetic retinopathy without macular edema, right eye
  • Z79.4: Long term (current) use of insulin

Clinical Criteria for Severe NPDR

Severe Nonproliferative Diabetic Retinopathy is typically defined by the 4-2-1 Rule:

  • 4: Hemorrhages and microaneurysms in all 4 quadrants.
  • 2: Venous beading in 2 or more quadrants.
  • 1: Intraretinal Microvascular Abnormalities (IRMA) in 1 or more quadrants.
  • Presence of any one of these criteria qualifies as Severe NPDR. AAO Preferred Practice Pattern

CMS ICD-10-CM Official Guidelines for Coding and Reporting FY 2025 CMS-HCC Risk Adjustment Model V28 Summary CMS MS-DRG Definitions Manual v42 NCHS ICD-10-CM Tabular List 2025 American Academy of Ophthalmology Preferred Practice Pattern

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