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E66.2

Morbid (severe) obesity with alveolar hypoventilation

Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 5 never code together
E66code
Excludes2
  • adiposogenital dystrophy (E23.6)E23.6
  • lipomatosis dolorosa [Dercum] (E88.2)E88.2
  • lipomatosis NOS (E88.2)E88.2
  • Prader-Willi syndrome (Q87.11)Q87.11
E00-E89chapter
Excludes1
  • transitory endocrine and metabolic disorders specific to newborn (P70-P74)P70-P74

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 5
E66.2code
Inclusion terms
  • Obesity hypoventilation syndrome (OHS)
  • Pickwickian syndrome
E66code
Code first
  • obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)O99.21-
Use additional code
  • code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-)Z68.1-Z68.45Z68.5-
E00-E89chapter
Notes
  • 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.E05.8E07.0E16-E31E34.-
Index entries leading here 4
  • Syndrome — see also Disease
    • alveolar hypoventilation E66.2
    • cardiopulmonary-obesity E66.2
    • hypoventilation, obesity (OHS) E66.2
    • obesity hypoventilation (OHS) E66.2
    • Pickwickian E66.2
  • Obesity E66.9
    • morbid E66.01
      • with
        • alveolar hypoventilation E66.2
        • obesity hypoventilation syndrome (OHS) E66.2
    • hypoventilation syndrome (OHS) E66.2
    • with alveolar hypoventilation E66.2
  • OHS (obesity hypoventilation syndrome) E66.2
  • Pickwickian syndrome E66.2
Alongside this code 5 same parent — E66
E66.0 Obesity due to excess calories category E66.1 Drug-induced obesity E66.3 Overweight E66.8 Other obesity category E66.9 Obesity, unspecified
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

CMS22HCC22 CMS28HCC48 ESRD21HCC22 ESRD24HCC22

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This code

Billable
yes
Code set
FY2026
Parent
E66
Block
E65-E68
Siblings
5

Present FY2024–FY2027.