ICD-10-CM 2027
ICD-10 code for exogenous obesity
From the official ICD-10-CM alphabetic index entry “Obesity › exogenous”. Page updated September 29, 2026.
About coding exogenous obesity
The ICD-10-CM code for exogenous obesity is E66.09 (Other obesity due to excess calories).
Within E66.0, choose E66.09 (Other obesity due to excess calories) only when documentation doesn't support a more specific option: Morbid (severe) obesity due to excess calories (E66.01).
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-).
Common questions about exogenous obesity ICD-10 codes
What is the ICD-10 code for exogenous obesity?
- E66.09 — Other obesity due to excess calories.
Is E66.09 billable?
- Yes. E66.09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E66.09 be used as a principal diagnosis?
- It can, but When it is the principal diagnosis, Medicare considers it a questionable reason for an inpatient admission, so claims may be reviewed.
Is E66.09 a CC or MCC?
- No. E66.09 is neither a CC nor an MCC under MS-DRG v44.0.