E11.3211

🩺 ICD-10 CM E11.3211 - Type 2 Diabetes Mellitus with Mild Nonproliferative Diabetic Retinopathy with Macular Edema, Right Eye

Description

Full Description: Type 2 diabetes mellitus with mild nonproliferative diabetic retinopathy with macular edema, right eye¹

Short Description: Type 2 diab with mild nonp rtnop with macular edema, r eye²

Code Classification & Hierarchy

ICD-10-CM Code Tree

E00-E89: Endocrine, Nutritional and Metabolic Diseases
  └─ E08-E13: Diabetes Mellitus
      └─ E11: Type 2 Diabetes Mellitus
          └─ E11.3: Type 2 DM with Ophthalmic Complications
              └─ E11.32: Type 2 DM with Mild Nonproliferative Diabetic Retinopathy
                  └─ E11.321: Type 2 DM with Mild NPDR with Macular Edema
                      ├─ E11.3211: Right Eye
                      ├─ E11.3212: Left Eye
                      ├─ E11.3213: Bilateral
                      └─ E11.3219: Unspecified Eye

Related Parent Codes

• E11 - Type 2 diabetes mellitus (non-billable)³
• E11.3 - Type 2 diabetes mellitus with ophthalmic complications (non-billable)³
• E11.32 - Type 2 diabetes mellitus with mild nonproliferative diabetic retinopathy (non-billable)³
• E11.321 - Type 2 diabetes mellitus with mild nonproliferative diabetic retinopathy with macular edema (non-billable, requires 7th character for laterality)³

Clinical Information

Pathophysiology

Type 2 diabetes mellitus is a chronic metabolic disorder characterized by elevated blood glucose levels resulting from insulin resistance and relative insulin deficiency. When diabetes affects the retinal vasculature, it leads to diabetic retinopathy.⁴

Nonproliferative Diabetic Retinopathy (NPDR): The early stage of diabetic retinopathy characterized by retinal vascular changes without neovascularization. Mild NPDR typically presents with microaneurysms, occasional dot/blot hemorrhages, and hard exudates.⁵

Macular Edema: Thickening of the macula due to leakage of fluid from damaged retinal blood vessels. This is a major cause of vision loss in diabetic patients and can occur at any stage of diabetic retinopathy.⁶

Clinical Presentation

Patients with mild nonproliferative diabetic retinopathy with macular edema may present with:

• Blurred or distorted central vision
• Difficulty reading or recognizing faces
• Colors appearing washed out or faded
• Metamorphopsia (visual distortion)
• Asymptomatic in early stages (often detected on screening exam)⁷

Diagnostic Criteria

Diagnosis requires documentation of:

1. Confirmed Type 2 Diabetes Mellitus - Previous diagnosis with ongoing treatment/monitoring
2. Ophthalmologic Examination - Fundoscopic exam or retinal imaging showing:
   • Microaneurysms
   • Retinal hemorrhages(few dot/blot)
   • Hard exudates
   • Mild NPDR characteristics
3. Macular Edema - Confirmed by:
   • Clinical examination (slit lamp biomicroscopy)
   • Optical Coherence Tomography (OCT) showing retinal thickening
   • Fluorescein angiography showing vascular leakage
4. Laterality - Specific documentation that findings are in the right eye⁸

Coding Guidelines & Requirements

ICD-10-CM Official Guidelines

Code First Requirements: None

Use Additional Code To Identify Control Using:⁹

• Z79.4 - Long term (current) use of insulin
• Z79.84 - Long term (current) use of oral hypoglycemic drugs
• Z79.85 - Long term (current) use of injectable non-insulin antidiabetic drugs

Includes

Per parent code E11:¹⁰

• Diabetes (mellitus) due to insulin secretory defect
• Diabetes NOS
• Insulin resistant diabetes (mellitus)

Excludes1

Per parent code E11:¹⁰

• E08.- - Diabetes mellitus due to underlying condition
• E09.- - Drug or chemical induced diabetes mellitus
• O24.4- - Gestational diabetes
• P70.2 - Neonatal diabetes mellitus
• E13.- - Postpancreatectomy diabetes mellitus
• E13.- - Postprocedural diabetes mellitus
• E13.- - Secondary diabetes mellitus NEC
• E10.- - Type 1 diabetes mellitus

Laterality Requirements

7th Character Assignment: The code structure requires specification of laterality via the final digit:¹¹

• 1 = Right eye (as in E11.3211)
• 2 = Left eye
• 3 = Bilateral
• 9 = Unspecified eye

CRITICAL: Laterality must be documented in the medical record. Use of unspecified eye (E11.3219) should only occur when laterality is truly unknown or not documented.¹²

ICD-10-CM Assumed Causal Relationship

ICD-10-CM assumes a causal relationship between diabetes and retinopathy. If a patient has documented diabetes AND retinopathy, it should be coded as diabetic retinopathy unless documentation explicitly states the retinopathy is NOT due to diabetes.¹³

Risk Adjustment & HCC Coding

HCC Mapping

HCC Category: HCC 18 - Diabetes with Chronic Complications¹⁴

CMS-HCC V28 Risk Adjustment Factor (RAF): 0.302¹⁵

HCC Hierarchy

Diabetes HCC codes exist within a hierarchy:¹⁶

1. HCC 17 - Diabetes with Acute Complications (RAF: 0.302)
   • Highest severity
   • Includes: ketoacidosis, hyperosmolarity, hypoglycemia with coma
2. HCC 18 - Diabetes with Chronic Complications (RAF: 0.302) ← This code
   • Includes: retinopathy, neuropathy, nephropathy, CKD, chronic complications
3. HCC 19 - Diabetes without Complication (RAF: 0.105)
   • Lowest severity
   • Includes: diabetes NOS, long-term insulin use

Important: Only the highest-ranked HCC within the hierarchy is captured for risk score calculation.¹⁷

HCC Documentation Requirements (MEAT Criteria)

To support HCC capture, documentation must include evidence of M.E.A.T.:¹⁸

• Monitor - Tracking condition (HbA1c, blood glucose, eye exams)
• Evaluate - Assessment of current status, stability, progression
• Assess - Impact on treatment decisions, medication adjustments
• Treat - Active treatment/management (medications, monitoring, referrals)

Annual Recapture: HCC conditions reset annually and must be documented at least once per calendar year to maintain the patient’s risk score.¹⁹

RAF Score Impact Example

Example Patient Profile:²⁰

• 72-year-old female
• Community-dwelling, non-dual eligible
• Baseline demographic RAF: 0.386

Diagnosis: E11.3211 Type 2 DM with mild NPDR with macular edema, right eye

• HCC 18 RAF: +0.302

Total RAF Score: 0.688 Estimated Annual Cost: ~$5,504

(Calculation: Medicare base rate × RAF score)

MS-DRG Information

Major Diagnostic Category

MDC 10 - Endocrine, Nutritional & Metabolic Diseases & Disorders²¹

MS-DRG Assignment

When E11.3211 is used as the principal diagnosis for an inpatient admission, the case groups to one of the following MS-DRGs (v43.0):²²

MS-DRG	Description	Severity Level
637	Diabetes with MCC	Major Complication/Comorbidity
638	Diabetes with CC	Complication/Comorbidity
639	Diabetes without CC/MCC	No additional complications

Note: Final MS-DRG assignment depends on:

• Principal diagnosis (PDx)
• Secondary diagnoses functioning as CCs or MCCs
• Procedures performed
• Patient demographics (age, sex, discharge status)
• CC Exclusions list²³

DRG Optimization Considerations

To optimize from DRG 639 → 638 → 637, documentation must capture secondary diagnoses that function as CCs or MCCs that are:

1. Present on admission or developed during the stay
2. NOT on the CC Exclusions list for the principal diagnosis
3. Appropriately documented with clinical evidence²⁴

wRVU & Reimbursement Metrics

Note: wRVU (work Relative Value Units) and assistant payable indicators apply to CPT procedure codes only, not to ICD-10-CM diagnosis codes. These metrics are not applicable to E11.3211.²⁵

However, accurate diagnosis coding with E11.3211 impacts:

• HCC risk adjustment payments in Medicare Advantage plans
• Quality measure reporting (Diabetes: Hemoglobin A1c Poor Control >9%)
• MS-DRG assignment for inpatient reimbursement
• Medical necessity for ophthalmology procedures (OCT, fluorescein angiography, anti-VEGF injections)²⁶

Quality Measures

Medicare Quality Payment Program (QPP)

Code E11.3211 triggers the following quality measures:²⁷

Quality Measure: Diabetes: Hemoglobin A1c (HbA1c) Poor Control (>9%)

• Description: Percentage of patients 18-75 years of age with diabetes who had hemoglobin A1c > 9.0% during the measurement period
• Impact: This is a negative outcome measure (lower percentage is better)
• Reporting: Required for MIPS and ACO programs

Related Codes & Sequencing

Related ICD-10-CM Codes

Same Laterality, Different Severity:

• E11.3291 - Type 2 DM with mild NPDR without macular edema, right eye
• E11.3311 - Type 2 DM with moderate NPDR with macular edema, right eye
• E11.3391 - Type 2 DM with moderate NPDR without macular edema, right eye
• E11.3411 - Type 2 DM with severe NPDR with macular edema, right eye
• E11.3511 - Type 2 DM with proliferative diabetic retinopathy with macular edema, right eye

Other Laterality, Same Severity:

• E11.3212 - Type 2 DM with mild NPDR with macular edema, left eye
• E11.3213 - Type 2 DM with mild NPDR with macular edema, bilateral
• E11.3219 - Type 2 DM with mild NPDR with macular edema, unspecified eye

Other Diabetic Complications:

• E11.21 - Type 2 DM with diabetic nephropathy (HCC 18)
• E11.22 - Type 2 DM with diabetic chronic kidney disease (HCC 18 + potential HCC 138)
• E11.40 - Type 2 DM with diabetic neuropathy, unspecified (HCC 18)
• E11.51 - Type 2 DM with diabetic peripheral angiopathy without gangrene (HCC 18)
• E11.65 - Type 2 DM with hyperglycemia (HCC 18)

Commonly Used Additional Codes

Diabetes Management:

• Z79.4 - Long term (current) use of insulin
• Z79.84 - Long term (current) use of oral hypoglycemic drugs
• Z79.85 - Long term (current) use of injectable non-insulin antidiabetic drugs

Related Manifestations:

• H35.81 - Retinal edema (additional code if needed for more specificity)
• E11.36 - Type 2 DM with diabetic cataract (if concurrent)
• Various CKD codes (N18.1-N18.6) if diabetic nephropathy is also present

Code Sequencing

General Rule: Sequence codes based on the reason for the encounter.²⁸

Example Scenarios:

1. Outpatient ophthalmology visit for diabetic retinopathy management:

   • Primary: E11.3211
   • Additional: Z79.4 (if on insulin)

2. Inpatient admission for diabetic retinopathy complication:

   • Principal: E11.3211
   • Secondary: Other diabetic complications as documented
   • Additional: Diabetes management codes

3. Annual diabetic exam with multiple complications:

   • First-listed: Primary reason for visit
   • Additional: E11.3211, other diabetic complications
   • Document all chronic conditions annually for HCC capture

Coding Examples

Example 1: Routine Ophthalmology Follow-Up

Clinical Scenario: 68-year-old female with known type 2 diabetes presents for routine diabetic eye exam. Dilated fundoscopic examination and OCT imaging reveal microaneurysms, scattered dot-blot hemorrhages, and macular edema in the right eye consistent with mild nonproliferative diabetic retinopathy. Left eye shows background diabetic retinopathy without macular edema. Patient is currently on metformin and long-acting insulin.

Documentation Requirements: ✓ Type 2 diabetes confirmed ✓ Mild NPDR characteristics documented ✓ Macular edema confirmed (OCT findings) ✓ RIGHT eye specifically documented ✓ MEAT criteria met (Monitoring, Evaluating, Assessing, Treating)

Coding:

• E11.3211 - Type 2 DM with mild NPDR with macular edema, right eye
• E11.3292 - Type 2 DM with mild NPDR without macular edema, left eye
• Z79.4 - Long term (current) use of insulin
• Z79.84 - Long term (current) use of oral hypoglycemic drugs

HCC Impact: HCC 18 (RAF 0.302) captured for risk adjustment

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Example 2: Inpatient Admission with Multiple Complications

Clinical Scenario: 75-year-old male admitted for poorly controlled diabetes with HbA1c of 10.2%. Medical history includes type 2 diabetes with known diabetic retinopathy. During hospitalization, ophthalmology consult confirms mild nonproliferative diabetic retinopathy with macular edema in the right eye on OCT. Patient also has diabetic nephropathy with stage 3 CKD (eGFR 42). Developed acute hypoglycemia during insulin adjustment.

Documentation Requirements: ✓ Principal diagnosis: Poorly controlled diabetes ✓ All chronic complications documented during stay ✓ Ophthalmology consultation note confirms findings ✓ Laterality specified (right eye) ✓ CKD stage documented ✓ Acute complication (hypoglycemia) documented

Coding:

• Principal Diagnosis: E11.65 - Type 2 DM with hyperglycemia
• Secondary Diagnoses:
  • E11.3211 - Type 2 DM with mild NPDR with macular edema, right eye
  • E11.22 - Type 2 DM with diabetic chronic kidney disease
  • N18.3- - Chronic kidney disease, stage 3 (stages 1-3)
  • E11.649 - Type 2 DM with hypoglycemia without coma
• Additional: Z79.4 - Long term (current) use of insulin

MS-DRG Assignment: Likely groups to 637 or 638 (depending on whether secondary diagnoses function as MCC/CC)

HCC Impact: HCC 18 captured (retinopathy, nephropathy are within same HCC category)

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Example 3: Annual Wellness Visit - HCC Recapture

Clinical Scenario: 70-year-old female presents for Medicare Annual Wellness Visit. Past medical history notable for type 2 diabetes with diabetic retinopathy. Patient reports no vision changes. Last ophthalmology exam 6 months ago showed stable mild nonproliferative diabetic retinopathy with macular edema in the right eye per ophthalmology records. Current medications include metformin and insulin glargine. HbA1c today 7.2%.

Documentation Requirements: ✓ Chronic condition referenced/reviewed during visit ✓ Past diagnosis confirmed as current/ongoing ✓ Management plan addressed (continued monitoring) ✓ MEAT criteria met (even though not primary reason for visit)

Coding:

• Z00.00 - Encounter for general adult medical examination without abnormal findings
• E11.3211 - Type 2 DM with mild NPDR with macular edema, right eye
• Z79.4 - Long term (current) use of insulin
• Z79.84 - Long term (current) use of oral hypoglycemic drugs

HCC Recapture: HCC 18 captured for the current calendar year ensuring continued risk adjustment

Note: Wellness visit can carry diabetic retinopathy as secondary diagnosis if discussed/managed during visit, even if not the primary reason for the encounter.²⁹

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Example 4: Query for More Specific Documentation

Original Documentation: “Type 2 diabetes with retinopathy. OCT shows macular edema.”

Issue: Laterality not specified; severity of retinopathy not documented

Query to Provider: “Based on the OCT findings showing macular edema and the fundoscopic examination performed on [date], please document:

1. Which eye(s) is/are affected? (Right, left, or bilateral)
2. What is the severity of the diabetic retinopathy? (Mild, moderate, or severe nonproliferative? Proliferative?)
3. Can you confirm this represents mild nonproliferative diabetic retinopathy based on clinical findings?”

Improved Documentation After Query: “Type 2 diabetes mellitus with mild nonproliferative diabetic retinopathy with macular edema affecting the right eye, confirmed on OCT imaging dated [date].”

Coding:

• E11.3211 - Type 2 DM with mild NPDR with macular edema, right eye

Impact: Specific code allows for accurate HCC capture (HCC 18) and precise clinical documentation

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Common Coding Errors & Tips

Errors to Avoid

1. Using Unspecified Eye Code When Laterality Is Documented

   • ❌ Using E11.3219 when chart clearly states “right eye”
   • ✓ Use E11.3211 when right eye is documented

2. Failing to Code Diabetic Complications Annually

   • ❌ Not coding E11.3211 during annual wellness visit because “patient already has this diagnosis”
   • ✓ Code all chronic diabetic complications at least once annually for HCC recapture³⁰

3. Not Linking Retinopathy to Diabetes

   • ❌ Coding H35.81 (retinal edema) separately without diabetic combination code
   • ✓ Use E11.3211 which includes both the diabetes and the complication³¹

4. Missing Additional Diabetes Management Codes

   • ❌ Not adding Z79.4 or Z79.84 when patient is on insulin or oral agents
   • ✓ Always use additional codes to identify diabetes control method

5. Coding Acute and Chronic Complications Incorrectly

   • ❌ Coding only E11.3211 when patient has both retinopathy and acute ketoacidosis
   • ✓ Code both complications; the acute complication (HCC 17) will take precedence in the hierarchy

Coding Tips

✓ Document Laterality: Always ensure eye examinations specifically state which eye(s) are affected³²

✓ Use Combination Codes: E11.3211 captures both diabetes AND the retinopathy complication - don’t code them separately

✓ Annual Documentation: Ensure all chronic diabetic complications are documented at least once per calendar year for risk adjustment

✓ MEAT Criteria: Every HCC diagnosis should have evidence of Monitor, Evaluate, Assess, or Treat in the documentation

✓ Specificity Matters: “Diabetic retinopathy” is not enough - need severity (mild/moderate/severe NPDR or PDR) and presence/absence of macular edema

✓ Check for Updates: ICD-10-CM codes are updated annually on October 1st - verify code validity for the date of service

Documentation Best Practices

Essential Documentation Elements

For optimal coding of E11.3211, provider documentation should include:³³

1. Diabetes Status

   • Type 2 diabetes mellitus confirmed
   • Current management (diet, oral agents, insulin, non-insulin injectables)
   • Most recent HbA1c value and date
   • Control status (controlled, poorly controlled, uncontrolled)

2. Ophthalmologic Findings

   • Examination date
   • Examination method (dilated fundoscopy, OCT, fluorescein angiography)
   • Specific findings:
     • Microaneurysms noted
     • Number/location of hemorrhages
     • Hard exudates if present
     • Severity level: mild nonproliferative
   • Macular edema confirmed (OCT measurements if available)
   • Laterality: Specifically state “right eye,” “OD,” or “right retina”

3. Assessment & Plan

   • Current status (stable, worsening, improving)
   • Treatment plan (observation, anti-VEGF injections, laser, etc.)
   • Follow-up interval
   • Any changes to diabetes management based on findings

4. MEAT Criteria Evidence

   • Monitoring: “Will continue to monitor with annual dilated eye exams”
   • Evaluating: “Retinopathy is stable compared to prior exam”
   • Assessing: “Macular edema may require intervention if worsens”
   • Treating: “Optimizing glycemic control; ophthalmology follow-up in 3 months”

Sample Documentation Template

DIABETIC RETINOPATHY ASSESSMENT

Diabetes Status:
- Type 2 diabetes mellitus, diagnosed [year]
- Current treatment: Metformin 1000mg BID, Insulin glargine 24 units qHS
- Most recent HbA1c: 7.8% ([date])
- Control: Adequately controlled

Ophthalmologic Examination ([date]):
- Method: Dilated fundoscopic examination with OCT imaging
- Right eye: Mild nonproliferative diabetic retinopathy with macular edema
  * Multiple microaneurysms noted in posterior pole
  * Scattered dot-blot hemorrhages (< 20)
  * OCT shows central subfield thickness of 342 microns
  * Macular edema present, center-involved
- Left eye: Few microaneurysms, no macular edema

Assessment:
Type 2 diabetes mellitus with mild nonproliferative diabetic retinopathy 
with macular edema, right eye. Stable compared to exam 6 months ago.

Plan:
- Continue current diabetes management regimen
- Ophthalmology follow-up in 3 months
- Consider anti-VEGF therapy if edema progresses
- Optimize glycemic control (goal HbA1c < 7%)
- Patient educated on importance of diabetes control for retinopathy

This documentation supports: E11.3211, Z79.4, Z79.84, and HCC 18 capture

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References & Resources

Coding Resources

• ICD-10-CM Official Guidelines for Coding and Reporting
• CMS HCC Risk Adjustment Model Documentation
• AAPC ICD-10-CM Code Book
• American Academy of Ophthalmology Coding Guidelines

Clinical Resources

• American Diabetes Association Standards of Care
• Diabetic Retinopathy Clinical Research Network (DRCR.net)
• International Council of Ophthalmology Guidelines
• National Eye Institute - Diabetic Retinopathy Information

Quality Measures

• CMS Quality Payment Program (QPP) Resources
• MIPS Quality Measures for Diabetes Care
• HEDIS Measures - Comprehensive Diabetes Care

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Version History

Date	Version	Changes
2025-10-01	FY 2026	Code remains valid, no changes from FY 2025
2024-10-01	FY 2025	Code remains valid, no changes from FY 2024
2016-10-01	FY 2017	Code introduced with ICD-10-CM laterality expansion

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Footer

Important: This reference guide is for educational purposes. Always verify codes with the current year’s official ICD-10-CM code set and consult official coding guidelines. When in doubt, query the provider for clarification.

Next Step: Review the entire E11.32 code family to understand the full spectrum of mild nonproliferative diabetic retinopathy codes and ensure you’re selecting the most specific code based on macular edema status and laterality.

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¹ ICD-10 Data ² ICD-10Data.com ³ CMS ICD-10-CM Guidelines ⁴ ICDList.com ⁵ AAO Coding Specialist ⁶ American Academy of Ophthalmology ⁷ National Eye Institute ⁸ ICD-10-CM Official Documentation ⁹ AAPC Codify ¹⁰ ICD-10Data.com Code Notes ¹¹ AAO ICD-10 Tables ¹² CMS Coding Guidelines ¹³ CCO Community HCC Query ¹⁴ 3M Inside Angle HCC ¹⁵ Mainline Health HCC Quick Reference ¹⁶ 3M HIS Diabetic HCC Guide ¹⁷ Security Health Plan HCC Documentation ¹⁸ BayCare Health Primary HCC Education ¹⁹ AAFP HCC Coding ²⁰ Mainline Health HCC Coding Corner ²¹ CMS MS-DRG Manual ²² ICD-10Data.com DRG Grouping ²³ Optum DRG Desk Reference ²⁴ Find-A-Code DRG Tutorial ²⁵ Medical Coding Standards ²⁶ ICDList.com Quality Measures ²⁷ CMS Quality Payment Program ²⁸ ICD-10-CM Sequencing Guidelines ²⁹ AAFP Risk Adjustment ³⁰ 24/7 Medical Billing Services HCC FAQ ³¹ ICD-10-CM Combination Code Guidelines ³² AAO Savvy Coder ³³ Coding Intel Documentation Best Practices