ICD-10 Code E66.09 – Other obesity due to excess calories (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E66.09 – Other obesity due to excess calories
What it is
E66.09 identifies obesity caused by excess calorie intake when the record does not specify another obesity type. Use it for patients whose weight status is documented as obesity and linked to overeating or excess calories.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the chart notes obesity, excessive body weight, or weight-related concerns, with the provider attributing the condition to excess caloric intake.
When to use this code
Use this code when the clinician documents obesity due to excess calories and does not name a more specific obesity category. It also fits when the note clearly links obesity to dietary excess. If the cause or obesity type is unclear, check documentation.
Do not use for
Do not use this code for obesity without a documented cause, or when the record identifies a different obesity type. If the diagnosis is only overweight or weight gain, this code is not appropriate.
Coding tip
Code the documented cause only when the provider explicitly links obesity to excess calories.