E66 Overweight and obesity

Not billable (header)Chapter 4

Report one of the more specific codes below.

Check coverage with this diagnosis

Codes under this one

E66.0 Obesity due to excess caloriesHeader
E66.1 Drug-induced obesity
E66.2 Morbid (severe) obesity with alveolar hypoventilation
E66.3 Overweight
E66.8 Other obesityHeader
E66.9 Obesity, unspecified

Instructional notes

Chapter 4

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.

transitory endocrine and metabolic disorders specific to newborn (P70-P74)

Notes

All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.

This code

Excludes2Not included here: the patient may have both; report both when both are present.

adiposogenital dystrophy (E23.6)
lipomatosis dolorosa [Dercum] (E88.2)
lipomatosis NOS (E88.2)
Prader-Willi syndrome (Q87.11)

Code firstSequence the underlying condition first.

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

Use additional codeAdd a second code for the full picture.

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

Chapter 4: Endocrine, nutritional and metabolic diseases · E65-E68 Overweight, obesity and other hyperalimentation (E65-E68)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.