ICD-10-CM E66 is the diagnosis code for Overweight and obesity. This code falls under the section "Overweight, obesity and other hyperalimentation" within Chapter 4 â Endocrine, nutritional and metabolic diseases (E00-E89). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions are not included in E66. If the patient has both, code each condition separately:
Understanding where E66 sits in the ICD-10-CM classification helps ensure proper coding:
No, E66 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
E66 is the ICD-10-CM diagnosis code for "Overweight and obesity". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
E66 is located in Section E65-E68 â "Overweight, obesity and other hyperalimentation" within Chapter 4 of the ICD-10-CM Tabular List.
E66 has 6 sub-code(s) that provide more specific detail: E66.0, E66.1, E66.2, E66.3, E66.8 and more.
Use E66 when the patients documented diagnosis matches "Overweight and obesity" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Overweight and obesity is E66.
No, E66 is non-billable. Use a more specific sub-code for primary diagnosis billing.
E66 is in Chapter 4 of the ICD-10-CM Tabular List.
Yes, E66 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.