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v1.0.0
ICD-10 Guide
ICD-10 CodesE66.0

E66.0

Billable

Obesity due to excess calories

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 E66.0 is a billable code used to indicate a diagnosis of obesity due to excess calories.

Key Diagnostic Point:

Obesity due to excess calories (E66.0) is a condition characterized by an excessive accumulation of body fat resulting from an imbalance between calorie intake and energy expenditure. This form of obesity is primarily driven by the consumption of more calories than the body can utilize, leading to weight gain and an increase in body mass index (BMI). BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters (kg/m²). A BMI of 30 or higher is classified as obesity. This condition can lead to various obesity-related complications, including type 2 diabetes, cardiovascular diseases, hypertension, and certain types of cancer. Management of obesity typically involves lifestyle modifications such as dietary changes, increased physical activity, and behavioral therapy. In some cases, pharmacotherapy or surgical interventions may be considered for weight management. Accurate coding of obesity due to excess calories is essential for appropriate treatment planning and reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in BMI calculations and classifications
  • Need for comprehensive documentation of dietary habits
  • Differentiation from other types of obesity (e.g., E66.1, E66.2)
  • Potential for co-morbid conditions requiring additional coding

Audit Risk Factors

  • Inadequate documentation of dietary intake
  • Failure to document BMI measurements
  • Lack of evidence for weight management interventions
  • Misclassification of obesity type

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Detailed patient history including dietary habits, BMI measurements, and any metabolic assessments.

Common Clinical Scenarios

Patients presenting with insulin resistance, type 2 diabetes, or metabolic syndrome.

Billing Considerations

Endocrinologists should document any hormonal evaluations that may contribute to obesity.

Nutrition

Documentation Requirements

Comprehensive dietary assessments and weight management plans.

Common Clinical Scenarios

Patients seeking dietary counseling for weight loss or management of obesity-related conditions.

Billing Considerations

Nutritionists should ensure that all dietary interventions are documented to support the diagnosis.

Coding Guidelines

Inclusion Criteria

Use E66.0 When
  • According to ICD
  • 10 guidelines, E66
  • 0 should be used when obesity is primarily due to excess caloric intake
  • Coders must ensure that the documentation supports the diagnosis and that BMI is calculated and recorded

Exclusion Criteria

Do NOT use E66.0 When
  • Exclusion criteria include obesity due to other medical conditions or drug use

Related ICD-10 Codes

Related CPT Codes

97802CPT Code

Medical nutrition therapy, individual, face-to-face

Clinical Scenario

Used for patients with obesity seeking dietary counseling.

Documentation Requirements

Document the patient's weight, BMI, and dietary goals.

Specialty Considerations

Nutritionists should ensure that the therapy plan aligns with the obesity diagnosis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of obesity types, improving the accuracy of diagnoses and treatment plans. E66.0 provides a clear classification for obesity due to excess calories, facilitating better management and reimbursement.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of obesity types, improving the accuracy of diagnoses and treatment plans. E66.0 provides a clear classification for obesity due to excess calories, facilitating better management and reimbursement.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    CDC Obesity Facts

Coding & Billing References

  • •
    CDC Obesity Facts

Frequently Asked Questions

What is the difference between E66.0 and E66.1?

E66.0 refers to obesity due to excess calories, while E66.1 is used for obesity caused by drug use. Accurate documentation of the cause of obesity is essential for correct coding.