ICD-10 Code E66.9 – Obesity, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E66.9 – Obesity, unspecified
What it is
E66.9 identifies obesity when the record does not specify the type or cause. Use it for excess body fat documented as obesity, without a more detailed category.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the chart notes generalized excess body weight or a clinician diagnosis of obesity without further specification.
When to use this code
Use E66.9 when the provider documents obesity but does not state morbid obesity, drug-induced obesity, or another defined form. It also fits when the note confirms obesity and no additional detail is available. Check documentation if the record suggests a more specific obesity code.
Do not use for
Do not use this code when the documentation identifies a more specific obesity type, such as morbid obesity or obesity due to another condition. Do not assign it for overweight alone.
Coding tip
Code the highest level of specificity supported by the note, and query the provider if the obesity type is unclear.