E66 Overweight and obesity

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Overweight and obesity is E66 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
E65-E68: Overweight, obesity and other hyperalimentation (E65-E68)
Category E66
14 codes (10 billable)
FY2026 Status
Stable since FY2024
Excludes2
Not included here. These conditions are coded elsewhere but may be coded together if applicable.
  • 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-)

Official Coding Guidelines

E66 obesity codes include causes/effects; other obesity codes exist

b. Obesity The obesity codes in category E66, Overweight and obesity, include codes related to the cause of obesity, such as drug-induced obesity (E66.1), and codes related to effects of obesity, such as code E66.2, Morbid (severe) obesity with alveolar hypoventilation. There are other codes related to obesity in other categories of the classification, such as E88.82, Obesity due to disruption of MC4R pathway; and codes in fifth character subcategory O99.21, Obesity complicating pregnancy, childbirth, and the puerperium.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.4.b
Diabetes mellitus (TOC entry)

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

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.4.a

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

References

Related Codes

More Specific Codes

E66.0 Obesity due to excess calories E66.01 Morbid (severe) obesity due to excess calories E66.09 Other obesity due to excess calories E66.1 Drug-induced obesity E66.2 Morbid (severe) obesity with alveolar hypoventilation E66.3 Overweight E66.8 Other obesity E66.81 Obesity class E66.811 Obesity, class 1 E66.812 Obesity, class 2 E66.813 Obesity, class 3 E66.89 Other obesity not elsewhere classified E66.9 Obesity, unspecified

Related Codes in E66

E66.0 Obesity due to excess calories E66.01 Morbid (severe) obesity due to excess calories E66.09 Other obesity due to excess calories E66.1 Drug-induced obesity E66.2 Morbid (severe) obesity with alveolar hypoventilation E66.3 Overweight E66.8 Other obesity E66.81 Obesity class E66.811 Obesity, class 1 E66.812 Obesity, class 2 E66.813 Obesity, class 3 E66.89 Other obesity not elsewhere classified E66.9 Obesity, unspecified
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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