New ICD-10 Codes for Obesity Treatment: Advancements in Accurate Diagnosis and Care

Effective October 1, 2024, new ICD-10-CM codes for both adult and childhood obesity will become available, representing a significant shift in the way obesity is diagnosed and managed in clinical settings. These changes align with the latest recommendations from leading professional societies, such as the American Academy of Pediatrics and the American Board of Obesity Medicine, aiming to improve the accuracy of obesity diagnoses and enhance treatment options for patients of all ages.

This update comes in response to the growing recognition that the previous coding system did not adequately capture the varying degrees of obesity, leading to inconsistent reporting, treatment, and management. With these new codes, healthcare providers will now have a more precise set of tools for coding obesity based on severity, contributing to more effective patient care, improved clinical outcomes, and a reduction in stigma associated with obesity.

Why are the new codes necessary?

Obesity is a complex, chronic disease that poses serious health risks, contributing to increased medical costs and reduced quality of life. In both adults and children, obesity has been a significant public health challenge, driving a need for more precise medical classification systems. Prior to this update, the ICD-10-CM codes failed to fully represent the various levels of obesity severity, leading to gaps in treatment and underreporting in medical claims data.

Obesity, particularly in children, is classified according to age- and gender-specific percentiles, making coding accuracy crucial for appropriate diagnosis and intervention. The new codes reflect the latest clinical guidelines, offering a more granular approach to the diagnosis of obesity, particularly in relation to its severity and associated complications.

What are the new codes?

For both adults and children, the new ICD-10-CM codes have been developed to classify obesity into three distinct categories based on severity:

• Class 1 Obesity: Body Mass Index (BMI) ≥ 30.0 to less than 35.0

• Class 2 Obesity: BMI ≥ 35.0 to less than 40.0

• Class 3 Obesity: BMI ≥ 40.0

The specific codes for these classifications include:

• E66.811: Obesity Class 1

• E66.812: Obesity Class 2

• E66.813: Obesity Class 3

*Use the new E-codes (E66.811, E66.812, and E66.813) together with the existing Z-codes for adults with obesity to increase accuracy and available treatment options.

For pediatric patients, the above codes are accompanied by a set of new Z-codes based on age- and gender-specific BMI percentiles. These include:

• Z68.54: BMI pediatric 95th percentile to less than 120% of the 95th percentile (Obesity Class 1)

• Z68.55: BMI pediatric 120% to less than 140% of the 95th percentile (Obesity Class 2)

• Z68.56: BMI pediatric 140% of the 95th percentile and above (Obesity Class 3)

These Z-codes will be used alongside the E66 codes to provide a more detailed picture of obesity severity in children and adolescents. Importantly, these new codes will replace older codes (e.g., E66.01, E66.09), ensuring that the new classification system is integrated into clinical practice moving forward.

How will these new codes help providers and patients?

The introduction of these new codes offers numerous benefits for healthcare providers and their patients:

1. Improved Diagnostic Accuracy

The previous ICD-10-CM codes were limited in their ability to accurately capture the severity of obesity. By providing a more precise classification system, the new codes will enable healthcare providers to better diagnose and manage obesity. This is particularly important for pediatric patients, where the severity of obesity can vary significantly based on age and growth patterns.

2. Enhanced Data Utility and Research

Obesity has been historically under-coded in healthcare claims data, which has limited the ability to fully understand the healthcare burden and associated costs of the disease. The new codes are expected to improve coding practices, enabling more accurate data collection and analysis, and facilitating research into obesity prevention and treatment. With better data, healthcare providers and policymakers will be able to develop more effective strategies for addressing the obesity epidemic.

3. Reducing Stigma and Bias

Obesity is a condition often associated with stigma, which can create barriers to effective treatment. The new ICD-10-CM codes aim to reduce this stigma by using clinically relevant terms that focus on severity rather than pejorative descriptors. For example, healthcare providers are encouraged to use terms like "Class III Obesity" instead of "morbid obesity due to excess calories," fostering a more supportive and respectful patient-provider relationship.

4. Facilitating Appropriate Treatment

By distinguishing between different classes of obesity, the new codes will help healthcare providers tailor treatment plans to the specific needs of each patient. This individualized approach to obesity care is essential for improving health outcomes, particularly in children and adolescents who may require early and ongoing interventions to manage their weight effectively.

Next Steps for Healthcare Providers

As the new ICD-10-CM codes are set to go into effect in October 2024, healthcare providers should begin preparing for their implementation now. Here are a few key steps to take:

1. Update Coding Practices: Replace outdated codes with the new E66 and Z68 codes. Ensure that your Electronic Health Record (EHR) system is updated and that your billing team is familiar with the new coding practices.

1. Educate Clinical Staff: Share this information with your clinical team to ensure that everyone is aware of the new codes and how to use them appropriately.

1. Communicate with Patients: Use this opportunity to talk to your patients about the changes in obesity care, emphasizing the importance of using accurate, clinically relevant terms when discussing their treatment options.

The introduction of these new codes marks an important step forward in improving obesity care for patients of all ages. By adopting these codes, healthcare providers can ensure that their patients receive the accurate diagnosis, support, and treatment they need to manage obesity effectively.

Find the full list of updated ICD-10 codes at: https://icd10cmtool.cdc.gov/?fy=FY2025&query=E66

Find more information from the CDC on the adult codes here.

Find more information from the CDC on the pediatric codes here.