E66.8Other obesity

E66.8 is the ICD-10-CM diagnosis code for other obesity. It belongs to category E66 (Overweight and obesity), block E65-E68 (Overweight, obesity and other hyperalimentation) and chapter 4 (endocrine, nutritional and metabolic diseases). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within E66, choose E66.8 (Other obesity) only when documentation doesn't support a more specific option: obesity due to excess calories (E66.0), drug-induced obesity (E66.1), Morbid (severe) obesity with alveolar hypoventilation (E66.2), Overweight (E66.3) and obesity, unspecified (E66.9).

To report this condition, pick the subcode that matches the documentation: E66.81 (class) and E66.89 (not elsewhere classified).

Code first: obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-).

Use an additional code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2025 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 278.00 (obesity, unspecified).