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E66

Non-billable

Overweight and obesity

E66 is the ICD-10-CM code for Overweight and obesity. It is a non-billable category code — use a more specific child code such as E66.0 for billing.

Status
Header (non-billable)
Chapter
E00-E89
Subcodes
6
Edition
FY2026

E00-E89 Endocrine, nutritional and metabolic diseases

What this means — in plain language

MedlinePlus · NIH

What is body weight? Body weight is the total mass of your body. Keeping track of your weight is one way to check for changes in your health, but it can't tell you the whole story. That's because your weight includes muscle, bone, fat, and water. Also, everyday factors can play a role in your weight, such as your: Diet Activity level Stress level Sleep habits Family history and genetics Age What factors help…

Read more about Body Weight at MedlinePlus ↗
Obesity ↗Food Portions: Choosing Just Enough for You ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Excludes2 — not included here

  • •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-)

Medications indicated for this condition

FDA labeling

Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.

Conditions mapped to this code

MedlinePlus · NIH
Obesity

Plain-language health-topic references grounded in MedlinePlus (NIH/NLM).

Frequently asked questions

What is ICD-10 code E66?
E66 is the ICD-10-CM code for "Overweight and obesity". It falls under E00-E89 Endocrine, nutritional and metabolic diseases.
Is E66 a billable code?
No — E66 is a non-billable header code. Use a more specific child code (such as E66.0) for billing.
What are the subcodes of E66?
E66 has 6 more specific child codes, including E66.0, E66.1, E66.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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