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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

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-)

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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