2019 ICD-10-CM Diagnosis Code E66

Overweight and obesity

    2016 2017 2018 2019 Non-Billable/Non-Specific Code
  • E66 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2019 edition of ICD-10-CM E66 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of E66 - other international versions of ICD-10 E66 may differ.
Use Additional
Use Additional Help
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. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • code to identify body mass index (BMI), if known (
    ICD-10-CM Diagnosis Code Z68
    • Z68 Body mass index [BMI]
      • Z68.1 Body mass index (BMI) 19.9 or less, adult
      • Z68.2 Body mass index (BMI) 20-29, adult
        • Z68.20 Body mass index (BMI) 20.0-20.9, adult
        • Z68.21 Body mass index (BMI) 21.0-21.9, adult
        • Z68.22 Body mass index (BMI) 22.0-22.9, adult
        • Z68.23 Body mass index (BMI) 23.0-23.9, adult
        • Z68.24 Body mass index (BMI) 24.0-24.9, adult
        • Z68.25 Body mass index (BMI) 25.0-25.9, adult
        • Z68.26 Body mass index (BMI) 26.0-26.9, adult
        • Z68.27 Body mass index (BMI) 27.0-27.9, adult
        • Z68.28 Body mass index (BMI) 28.0-28.9, adult
        • Z68.29 Body mass index (BMI) 29.0-29.9, adult
      • Z68.3 Body mass index (BMI) 30-39, adult
        • Z68.30 Body mass index (BMI) 30.0-30.9, adult
        • Z68.31 Body mass index (BMI) 31.0-31.9, adult
        • Z68.32 Body mass index (BMI) 32.0-32.9, adult
        • Z68.33 Body mass index (BMI) 33.0-33.9, adult
        • Z68.34 Body mass index (BMI) 34.0-34.9, adult
        • Z68.35 Body mass index (BMI) 35.0-35.9, adult
        • Z68.36 Body mass index (BMI) 36.0-36.9, adult
        • Z68.37 Body mass index (BMI) 37.0-37.9, adult
        • Z68.38 Body mass index (BMI) 38.0-38.9, adult
        • Z68.39 Body mass index (BMI) 39.0-39.9, adult
      • Z68.4 Body mass index (BMI) 40 or greater, adult
        • Z68.41 Body mass index (BMI) 40.0-44.9, adult
        • Z68.42 Body mass index (BMI) 45.0-49.9, adult
        • Z68.43 Body mass index (BMI) 50-59.9, adult
        • Z68.44 Body mass index (BMI) 60.0-69.9, adult
        • Z68.45 Body mass index (BMI) 70 or greater, adult
      • Z68.5 Body mass index (BMI) pediatric
        • Z68.51 Body mass index (BMI) pediatric, less than 5t...
        • Z68.52 Body mass index (BMI) pediatric, 5th percenti...
        • Z68.53 Body mass index (BMI) pediatric, 85th percent...
        • Z68.54 Body mass index (BMI) pediatric, greater than...
    Z68.-
    )
Code First
Code First Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, 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. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • obesity complicating pregnancy, childbirth and the puerperium, if applicable (
    ICD-10-CM Diagnosis Code O99.21

    Obesity complicating pregnancy, childbirth, and the puerperium

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Use Additional
    • code to identify the type of obesity (E66.-)
    O99.21-
    )
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as E66. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • adiposogenital dystrophy (
    ICD-10-CM Diagnosis Code E23.6

    Other disorders of pituitary gland

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Abscess of pituitary
    • Adiposogenital dystrophy
    E23.6
    )
  • lipomatosis NOS (
    ICD-10-CM Diagnosis Code E88.2

    Lipomatosis, not elsewhere classified

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Lipomatosis NOS
    • Lipomatosis (Check) dolorosa [Dercum]
    E88.2
    )
  • lipomatosis dolorosa [Dercum] (
    ICD-10-CM Diagnosis Code E88.2

    Lipomatosis, not elsewhere classified

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Lipomatosis NOS
    • Lipomatosis (Check) dolorosa [Dercum]
    E88.2
    )
  • Prader-Willi syndrome (
    ICD-10-CM Diagnosis Code Q87.1

    Congenital malformation syndromes predominantly associated with short stature

      2016 2017 2018 2019 Billable/Specific Code POA Exempt
    Applicable To
    • Aarskog syndrome
    • Cockayne syndrome
    • De Lange syndrome
    • Dubowitz syndrome
    • Noonan syndrome
    • Prader-Willi syndrome
    • Robinow-Silverman-Smith syndrome
    • Russell-Silver syndrome
    • Seckel syndrome
    Type 1 Excludes
    • Ellis-van Creveld syndrome (Q77.6)
    • Smith-Lemli-Opitz syndrome (E78.72)
    Q87.1
    )
The following code(s) above E66 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:
  • E00-E89
    2019 ICD-10-CM Range E00-E89

    Endocrine, nutritional and metabolic diseases

    Note
    • 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
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.
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
Code annotations containing back-references to E66:
  • Code First: Z99.3
    ICD-10-CM Diagnosis Code Z99.3

    Dependence on wheelchair

      2016 2017 2018 2019 Billable/Specific Code POA Exempt
    Applicable To
    • Wheelchair confinement status
    Code First
    • cause of dependence, such as:
    • muscular dystrophy (G71.0-)
    • obesity (E66.-)
  • Type 1 Excludes: R63.5
    ICD-10-CM Diagnosis Code R63.5

    Abnormal weight gain

      2016 2017 2018 2019 Billable/Specific Code
    Type 1 Excludes
    • excessive weight gain in pregnancy (O26.0-)
    • obesity (E66.-)
  • Use Additional: O99.21
    , E88.81
    ICD-10-CM Diagnosis Code O99.21

    Obesity complicating pregnancy, childbirth, and the puerperium

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Use Additional
    • code to identify the type of obesity (E66.-)
    ICD-10-CM Diagnosis Code E88.81

    Metabolic syndrome

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Dysmetabolic syndrome X
    Use Additional
    • codes for associated manifestations, such as:
    • obesity (E66.-)
ICD-10-CM Codes Adjacent To E66
E63.8 Other specified nutritional deficiencies
E63.9 Nutritional deficiency, unspecified
E64 Sequelae of malnutrition and other nutritional deficiencies
E64.0 Sequelae of protein-calorie malnutrition
E64.1 Sequelae of vitamin A deficiency
E64.2 Sequelae of vitamin C deficiency
E64.3 Sequelae of rickets
E64.8 Sequelae of other nutritional deficiencies
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

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