2020 ICD-10-CM Diagnosis Code E66.2

Morbid (severe) obesity with alveolar hypoventilation

    2016 2017 2018 2019 2020 Billable/Specific Code
  • E66.2 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 E66.2 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of E66.2 - other international versions of ICD-10 E66.2 may differ.
Applicable To
  • Obesity hypoventilation syndrome (OHS)
  • Pickwickian syndrome
The following code(s) above E66.2 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 E66.2:
  • 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
  • Extreme obesity with alveolar hypoventilation
  • Pickwickian syndrome
Clinical Information
  • Hypoventilation syndrome in very obese persons with excessive adipose tissue around the abdomen and diaphragm. It is characterized by diminished to absent ventilatory chemoresponsiveness; chronic hypoxia; hypercapnia; polycythemia; and long periods of sleep during day and night (hypersomnolence). It is a condition often related to obstructive sleep apnea but can occur separately.
ICD-10-CM E66.2 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 205 Other respiratory system diagnoses with mcc
  • 206 Other respiratory system diagnoses without mcc

Convert E66.2 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
Code annotations containing back-references to E66.2:
  • Type 1 Excludes: G47.3
    , E66.01
    ICD-10-CM Diagnosis Code G47.3

    Sleep apnea

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated underlying condition
    Type 1 Excludes
    • apnea NOS (R06.81)
    • Cheyne-Stokes breathing (R06.3)
    • pickwickian syndrome (E66.2)
    • sleep apnea of newborn (P28.3)
    ICD-10-CM Diagnosis Code E66.01

    Morbid (severe) obesity due to excess calories

      2016 2017 2018 2019 2020 Billable/Specific Code
    Type 1 Excludes
    • morbid (severe) obesity with alveolar hypoventilation (E66.2)

Diagnosis Index entries containing back-references to E66.2:
  • 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
    • morbid E66.01
      ICD-10-CM Diagnosis Code E66.01

      Morbid (severe) obesity due to excess calories

        2016 2017 2018 2019 2020 Billable/Specific Code
      Type 1 Excludes
      • morbid (severe) obesity with alveolar hypoventilation (E66.2)
      • with
        • alveolar hypoventilation E66.2
        • obesity hypoventilation syndrome E66.2 (OHS)
    • with alveolar hypoventilation E66.2
    • hypoventilation syndrome E66.2 (OHS)
  • OHS E66.2 (obesity hypoventilation syndrome)
  • Pickwickian syndrome E66.2
  • Syndrome - see also Disease
    • alveolar hypoventilation E66.2
    • cardiopulmonary-obesity E66.2
    • hypoventilation, obesity E66.2 (OHS)
    • obesity hypoventilation E66.2 (OHS)
    • Pickwickian E66.2

ICD-10-CM Codes Adjacent To E66.2
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
E67.3 Hypervitaminosis D
E67.8 Other specified hyperalimentation
E68 Sequelae of hyperalimentation

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