2026 ICD-10-CM Diagnosis Code E66Overweight and obesity
E66 is a non-billable ICD-10-CM category code for overweight and obesity, so it cannot be submitted on claims. Use a more specific code from this category instead, such as E66.01, E66.09, E66.1, and E66.2.
Code Identity
Code Classification
Specific Coding for Overweight and obesityOverview
Non-specific codes like E66 require more characters. Use one of these billable codes instead:
E66.0 for Obesity due to excess calories
Use E66.01 for Morbid (severe) obesity due to excess calories
Use E66.09 for Other obesity due to excess calories
Use E66.1 for Drug-induced obesity
Use E66.2 for Morbid (severe) obesity with alveolar hypoventilation
Use E66.3 for Overweight
E66.8 for Other obesity
E66.81 for Obesity class
Use E66.89 for Other obesity not elsewhere classified
Use E66.9 for Obesity, unspecified
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code First
- obesity complicating pregnancy, childbirth and the puerperium, if applicable O99.21
Use Additional Code
Type 2 Excludes
- adiposogenital dystrophy E23.6
- lipomatosis dolorosa Dercum E88.2
- lipomatosis NOS E88.2
- Prader-Willi syndrome Q87.11
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Patient EducationClinical
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:
The full article covers:
- What is body weight?
- What factors help determine a healthy body weight?
- What are body weight ranges?
- What if I have a sudden gain or loss of weight?
- How can I maintain a healthy body weight?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
