E66Overweight and obesity

E66 is the ICD-10-CM diagnosis code for Overweight and obesity. It belongs to 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 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: E66.0 (calories), E66.1 (obesity), E66.2 (hypoventilation), E66.3 (Overweight), E66.8 (obesity) and E66.9 (unspecified).

The conditions in its Excludes2 note aren't part of E66, but may be coded alongside it if the patient has both: adiposogenital dystrophy (E23.6), lipomatosis dolorosa [Dercum] (E88.2), lipomatosis NOS (E88.2) and Prader-Willi syndrome (Q87.11).

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 hasn't changed since.