2023 ICD-10-CM Diagnosis Code E66.9

Obesity, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Questionable As Admission Dx
  • E66.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2023 edition of ICD-10-CM E66.9 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of E66.9 - other international versions of ICD-10 E66.9 may differ.
ICD-10-CM Coding Rules
  • E66.9 is not usually sufficient justification for admission to an acute care hospital when used a principal diagnosis.
Applicable To
  • Obesity NOS
The following code(s) above E66.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to E66.9:
  • E00-E89
    2023 ICD-10-CM Range E00-E89

    Endocrine, nutritional and metabolic diseases

    • All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
    Type 1 Excludes
    • transitory endocrine and metabolic disorders specific to newborn (P70-P74)
    Endocrine, nutritional and metabolic diseases
  • E66
    ICD-10-CM Diagnosis Code E66

    Overweight and obesity

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Code First
    • obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
    Type 1 Excludes
    • adiposogenital dystrophy (E23.6)
    • lipomatosis NOS (E88.2)
    • lipomatosis dolorosa [Dercum] (E88.2)
    • Prader-Willi syndrome (Q87.11)
    Use Additional
    • code to identify body mass index (BMI), if known (Z68.-)
    Overweight and obesity
Approximate Synonyms
  • Adult obesity with bmi between 30 to 30.9
  • Adult obesity with bmi between 31 to 31.9
  • Adult obesity with bmi between 32 to 32.9
  • Adult obesity with bmi between 33 to 33.9
  • Adult obesity with bmi between 34 to 34.9
  • Adult obesity with bmi between 35 to 35.9
  • Adult obesity with bmi between 36 to 36.9
  • Adult obesity with bmi between 37 to 37.9
  • Adult obesity with bmi between 38 to 38.9
  • Adult obesity with bmi between 39 to 39.9
  • Childhood obesity
  • Childhood obesity, bmi 95-100 percentile
  • Maternal obesity complicating pregnancy, childbirth and the puerperium, antepartum
  • Maternal obesity during childbirth
  • Maternal obesity in pregnancy
  • Obesity (body mass index 96-100 percentile for age)
  • Obesity body mass index (bmi) 95-99 percentile for age
  • Obesity complicating period after childbirth
  • Obesity counseling
  • Obesity counseling done
  • Obesity in childbirth
  • Obesity in pregnancy
  • Obesity of adult, bmi 30-34.9
  • Obesity of adult, bmi 35-39.9
  • Obesity, bmi 30-34.9, adult
  • Obesity, bmi 35-39.9, adult
  • Obesity, body mass index (bmi) 30-30.9
  • Obesity, body mass index (bmi) 31-31.9
  • Obesity, body mass index (bmi) 32-32.9
  • Obesity, body mass index (bmi) 33-33.9
  • Obesity, body mass index (bmi) 34-34.9
  • Obesity, body mass index (bmi) 35-35.9
  • Obesity, body mass index (bmi) 36-36.9
  • Obesity, body mass index (bmi) 37-37.9
  • Obesity, body mass index (bmi) 38-38.9
  • Obesity, body mass index (bmi) 39-39.9
  • Postpartum obesity
Clinical Information
  • A condition marked by an abnormally high, unhealthy amount of body fat.
  • A disorder characterized by having a high amount of body fat.
  • A status with body weight that is grossly above the acceptable or desirable weight, usually due to accumulation of excess fats in the body. The standards may vary with age, sex, genetic or cultural background. In the body mass index, a bmi greater than 30.0 kg/m2 is considered obese, and a bmi greater than 40.0 kg/m2 is considered morbidly obese (morbid obesity).
  • Excessively high accumulation of body fat or adipose tissue in relation to lean body mass; the amount of body fat (or adiposity) includes concern for both the distribution of fat throughout the body and the size of the adipose tissue deposits; individuals are usually at high clinical risk because of excess amount of body fat (bmi greater than 30).
  • Having a high amount of body fat (body mass index [bmi] of 30 or more).
  • Having a high amount of body fat. A person is considered obese if they have a body mass index (bmi) of 30 or more.
  • Obesity means having too much body fat. It is different from being overweight, which means weighing too much. The weight may come from muscle, bone, fat and/or body water. Both terms mean that a person's weight is greater than what's considered healthy for his or her height. Obesity occurs over time when you eat more calories than you use. The balance between calories-in and calories-out differs for each person. Factors that might tip the balance include your genetic makeup, overeating, eating high-fat foods and not being physically active. Being obese increases your risk of diabetes, heart disease, stroke, arthritis and some cancers. If you are obese, losing even 5 to 10 percent of your weight can delay or prevent some of these diseases.
ICD-10-CM E66.9 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
  • 640 Miscellaneous disorders of nutrition, metabolism, fluids and electrolytes with mcc
  • 641 Miscellaneous disorders of nutrition, metabolism, fluids and electrolytes without mcc

Convert E66.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change

Diagnosis Index entries containing back-references to E66.9:

ICD-10-CM Codes Adjacent To E66.9
E64.9 Sequelae of unspecified nutritional deficiency
E65 Localized adiposity
E66 Overweight and obesity
E66.0 Obesity due to excess calories
E66.01 Morbid (severe) obesity due to excess calories
E66.09 Other 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
E67 Other hyperalimentation
E67.0 Hypervitaminosis A
E67.1 Hypercarotenemia
E67.2 Megavitamin-B6 syndrome
E67.3 Hypervitaminosis D
E67.8 Other specified hyperalimentation
E68 Sequelae of hyperalimentation
E70 Disorders of aromatic amino-acid metabolism
E70.0 Classical phenylketonuria
E70.1 Other hyperphenylalaninemias

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.