E66.89 Other obesity not elsewhere classified

The ICD-10-CM code for Other obesity not elsewhere classified is E66.89 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

4: Endocrine, nutritional and metabolic diseases (E00-E89)

Section

E65-E68: Overweight, obesity and other hyperalimentation (E65-E68)

Category E66

14 codes (10 billable)

FY2026 Status

Introduced in FY2025

Also Known As

ICD-10-CM Alphabetic Index entries that lead to E66.89:

• Obesity › familial
• Obesity › constitutional
• Obesity › glandular
• Obesity › endocrine
• Obesity › endogenous
• Obesity › specified type NEC

Official Coding Guidelines

Diabetes mellitus (TOC entry)

a. Diabetes mellitus ................................................................................................................... 39

Obesity (TOC entry)

b. Obesity .................................................................................................................................. 42

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool