2020 ICD-10-CM Diagnosis Code E66.01

Morbid (severe) obesity due to excess calories

    2016 2017 2018 2019 2020 Billable/Specific Code
  • E66.01 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM E66.01 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of E66.01 - other international versions of ICD-10 E66.01 may differ.
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 E66.01. 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.
  • morbid (severe) obesity with alveolar hypoventilation (
    ICD-10-CM Diagnosis Code E66.2

    Morbid (severe) obesity with alveolar hypoventilation

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Obesity hypoventilation syndrome (OHS)
    • Pickwickian syndrome
    E66.2
    )
The following code(s) above E66.01 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 E66.01:
  • E00-E89
    2020 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
  • E66
    ICD-10-CM Diagnosis Code E66

    Overweight and obesity

      2016 2017 2018 2019 2020 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
  • Morbid obesity
  • Obesity (body mass index (bmi) more than 40
  • Obesity body mass index (bmi) >=40
  • Obesity, body mass index (bmi 40-44.9
  • Obesity, body mass index (bmi) >= 70
  • Obesity, body mass index (bmi) 45-49.9
  • Obesity, body mass index (bmi) 50-59.9
  • Obesity, body mass index (bmi) 60-69.9
  • Obesity, body mass index (bmi) more than 99 percentile
  • Severe adult obesity with bmi between 40-44.9
  • Severe adult obesity with bmi between 45-49.9
  • Severe adult obesity with bmi between 50 to 59.9
  • Severe childhood obesity with bmi >99 percentile
  • Severe obesity
  • Severe obesity in pregnancy
  • Severely obese adult with body mass index
ICD-10-CM E66.01 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 640 Miscellaneous disorders of nutrition, metabolism, fluids and electrolytes with mcc
  • 641 Miscellaneous disorders of nutrition, metabolism, fluids and electrolytes without mcc

Convert E66.01 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

Diagnosis Index entries containing back-references to E66.01:
  • Obesity E66.9
    ICD-10-CM Diagnosis Code E66.9

    Obesity, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code Questionable As Admission Dx
    Applicable To
    • Obesity NOS
    • due to
      • excess calories E66.09
        ICD-10-CM Diagnosis Code E66.09

        Other obesity due to excess calories

          2016 2017 2018 2019 2020 Billable/Specific Code Questionable As Admission Dx
        • morbid E66.01
        • severe E66.01
    • morbid E66.01
      • due to excess calories E66.01
    • severe E66.01

ICD-10-CM Codes Adjacent To E66.01
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
E67.1 Hypercarotenemia
E67.2 Megavitamin-B6 syndrome

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