ICD-10 Code E66.0 – Obesity due to excess calories (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E66.0 – Obesity due to excess calories
What it is
E66.0 identifies obesity attributed to excess calorie intake. Use it when the record supports obesity related to overnutrition rather than another specified cause.
Clinical signs
Patients typically have excess body fat and a documented diagnosis of obesity. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents obesity due to excess calories, overfeeding, or similar wording. It may also fit when the note clearly links obesity to dietary excess. If the cause is not stated, check documentation before assigning this code.
Do not use for
Do not use it for obesity with a different documented cause or when obesity is not specified as due to excess calories. Check documentation if the record only says “obesity” without a causal link.
Coding tip
Code E66.0 only when the documentation supports the calorie-related cause; otherwise, query for clarification.