E66.2

Morbid (severe) obesity with alveolar hypoventilation

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC V28

HCC48

Morbid Obesity

CMS-HCC ESRD V24

HCC22

Morbid Obesity

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · E66.2

Synonyms

Obesity hypoventilation syndrome (OHS) Pickwickian syndrome

Inherited from E66Overweight and obesity

Excludes 2

adiposogenital dystrophy (E23.6) lipomatosis dolorosa [Dercum] (E88.2) lipomatosis NOS (E88.2) Prader-Willi syndrome (Q87.11)

Use additional

code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-)

Code first

obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)

Inherited from chapter 4Endocrine, nutritional and metabolic diseases

Excludes 1

transitory endocrine and metabolic disorders specific to newborn (P70-P74)

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.

Official Guidelines for E66.2

FY 2026 ›

I.C.4Chapter-specific guidanceChapter 4: Endocrine, Nutritional, and Metabolic Diseases (E00-E89)

Subsections

Sections that reference E66.2

Sections whose FY 2026 text names E66.2, its E66 category, or a range containing it — the chapter guidance above is the authoritative source.

Find E66.2 in the alphabetic index

11 index paths lead to this code