U.S. ICD-10-CM · FY 2027

E66 ICD-10-CM Code: Overweight and obesity

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

E66

Overweight and obesity

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where E66 sits

  1. 1

    Chapter 4

    Endocrine, nutritional and metabolic diseases (E00-E89)

  2. 2

    Section

    Overweight, obesity and other hyperalimentation (E65-E68)

  3. 3

    Category E66

    Overweight and obesity

  4. 4

    Code E66

    Overweight and obesity

More specific choices

Codes under E66

E66 is a non-billable category. Choose the child code that best matches the documented diagnosis.

E66.0

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

E66.9

Obesity, unspecified

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for E66.

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-)

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for E66.

Excludes2

Conditions not included here that may be reported separately when present.

  • adiposogenital dystrophy (E23.6)
  • lipomatosis dolorosa [Dercum] (E88.2)
  • lipomatosis NOS (E88.2)
  • Prader-Willi syndrome (Q87.11)

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code E66 mean?

E66 is the FY 2027 U.S. ICD-10-CM code for “Overweight and obesity.”

Is E66 a billable or specific ICD-10-CM code?

No. E66 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is E66 located in ICD-10-CM?

E66 is listed in Chapter 4, Endocrine, nutritional and metabolic diseases (E00-E89), within Overweight, obesity and other hyperalimentation (E65-E68) (E65–E68), under category E66, Overweight and obesity.

What coding notes are listed for E66?

No inclusion terms are listed for E66 in this reference record. Code-first instructions: obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-). Additional-code instructions: code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-). No Excludes1 note is listed. Excludes2 notes: adiposogenital dystrophy (E23.6); lipomatosis dolorosa [Dercum] (E88.2); lipomatosis NOS (E88.2); Prader-Willi syndrome (Q87.11).

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