ICD-10-CM 2027
ICD-10 code for Endogenous obesity
From the official ICD-10-CM alphabetic index entry “Obesity › endogenous”. Page updated September 29, 2026.
About coding Endogenous obesity
The ICD-10-CM code for Endogenous obesity is E66.89 (Other obesity not elsewhere classified).
Within E66.8 (other obesity), E66.89 is specifically for other obesity not elsewhere classified. Related codes cover obesity class (E66.81).
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 Endogenous obesity ICD-10 codes
What is the ICD-10 code for Endogenous obesity?
- E66.89 — Other obesity not elsewhere classified.
Is E66.89 billable?
- Yes. E66.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E66.89 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 E66.89 a CC or MCC?
- No. E66.89 is neither a CC nor an MCC under MS-DRG v44.0.