October 9, 2025
Accurate use of Morbid Obesity ICD-10 codes is essential for proper medical billing, patient care, and compliance. With 2025 updates to ICD-10-CM, healthcare providers must apply the correct diagnosis codes for obesity, morbid obesity, and BMI classifications to avoid claim denials and ensure accurate reimbursement.
E66.01 β Morbid (Severe) Obesity Due to Excess Calories
E66.9 β Obesity, Unspecified
E66.2 β Morbid Obesity with Alveolar Hypoventilation
E66.3 β Overweight
Code | Description | BMI Range |
Z68.3 | BMI 30β34.9 (Class 1 Obesity) | 30.0β34.9 |
Z68.41 | BMI 35β39.9 (Class 2 Obesity) | 35.0β39.9 |
Z68.43 | BMI 50β59.9 (Super Morbid Obesity) | 50.0β59.9 |
E66.8 | Other Obesity (Class 1/2) | 30β39.9 |
Always link BMI Z-codes with obesity diagnosis codes for compliance.
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Document BMI: Always record BMI β₯40 when coding E66.01.
Use Specific Codes: Avoid E66.9 unless details are missing.
Sequence Comorbidities First: Example β code I10 (hypertension) before E66.01.
Check Annual Updates: 2025 guidelines apply from October 1, 2024.
Mixing Classes: Class 2 obesity (Z68.41) β , Class 3 obesity (E66.01).
Ignoring BMI: Missing BMI documentation leads to denials.
Overusing Unspecified Codes: Only use E66.9 when no details exist.
Forgetting Comorbidities: Always code related conditions like OHS (E66.2).
Correctly applying Morbid Obesity ICD-10 codes such as E66.01, E66.9, and BMI Z-codes is critical for accurate billing, patient care, and compliance. With rising obesity-related health concerns, precise coding ensures healthcare providers receive proper reimbursement while delivering the highest standard of care.
Cures Medical Billing helps providers streamline ICD-10 coding, avoid claim denials, and stay compliant with annual updates. Contact us today for expert billing support.
The general ICD-10 code for obesity is E66.9, Obesity, unspecified.
The most used code is E66.01, Morbid (severe) obesity due to excess calories.
Yes, but payer-specific (morbid obesity ICD-10 billable codes).
Obesity is categorized into four primary types based on cause and distribution:
Based on BMI severity:
A BMI of β₯40, or β₯35 with comorbidities, is classified as morbid obesity.
Yes. Use BMI-for-age percentiles and ICD-10 codes Z68.5βZ68.54.
While ICD-10 codes capture diagnoses, CPT codes like 99401β99404 are used for obesity counseling.
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