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ICD-10-CM 2027 diagnosis code

E66.0Obesity due to excess calories

Not billable — use a more specific code

E66.0 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About E66.0

E66.0 is the ICD-10-CM diagnosis code for obesity due to excess calories. It belongs to category E66 (Overweight and obesity), block E65-E68 (Overweight, obesity and other hyperalimentation) and chapter 4 (endocrine, nutritional and metabolic diseases). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within E66 (Overweight and obesity), E66.0 is specifically for obesity due to excess calories. Related codes cover drug-induced obesity (E66.1), Morbid (severe) obesity with alveolar hypoventilation (E66.2), Overweight (E66.3), other obesity (E66.8) and obesity, unspecified (E66.9).

To report this condition, pick the subcode that matches the documentation: E66.01 (calories) and E66.09 (calories).

Code first: obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-).

Use an additional code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under E66.0

Notes that apply from higher levels

Instructions written at a parent level also apply to E66.0.

› From E66 Overweight and obesity
Excludes2
  • 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-)

Broader instructions also apply from Chapter 4: Endocrine, nutritional and metabolic diseases.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about E66.0

Is E66.0 billable?

No. E66.0 is a header code. Report one of its more specific subcodes instead.