E66
⚠ Non-billable
Overweight and obesity
ICD-10-CM · FY2026 · Endocrine, Nutritional and Metabolic Diseases
Code
E66
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Endocrine, Nutritional and Metabolic Diseases
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Excludes2 — not included here, but may code together
- adiposogenital dystrophy (E23.6)
- lipomatosis dolorosa [Dercum] (E88.2)
- lipomatosis NOS (E88.2)
- Prader-Willi syndrome (Q87.11)
Code first
- obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
Use additional code
- code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-)
Frequently asked questions
What is ICD-10 code E66?
ICD-10-CM code E66 represents Overweight and obesity. It is a non-billable header code requiring a more specific subcategory in the Endocrine, Nutritional and Metabolic Diseases chapter, effective October 1, 2025 – September 30, 2026.
Is E66 billable?
No. E66 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is E66 in?
E66 belongs to the Endocrine, Nutritional and Metabolic Diseases chapter (E00–E89) of ICD-10-CM.
Related codes in the E66 category
E66.0
Obesity due to excess calories
Non-billable
E66.1
Drug-induced obesity
Billable
E66.2
Morbid (severe) obesity with alveolar hypoventilation
Billable
E66.3
Overweight
Billable
E66.8
Other obesity
Non-billable
E66.9
Obesity, unspecified
Billable
E66.01
Morbid (severe) obesity due to excess calories
Billable
E66.09
Other obesity due to excess calories
Billable
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