E66.2 — Morbid (severe) obesity with alveolar hypoventilation
E66.2 is a billable, specific ICD-10-CM code for morbid (severe) obesity with alveolar hypoventilation. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Obesity hypoventilation syndrome (OHS)
- Pickwickian syndrome
Other codes that can never be billed with E66.2
These codes carry an Excludes1 note pointing at E66.2. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E66.2 alone.
Risk adjustment
E66.2 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 48 Morbid Obesity0.186 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
E66.2 is named in 9 Medicare coverage policies — 9 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56422Billing and Coding: Bariatric Surgical Management of Morbid Obesity
- A56717Billing and Coding: Respiratory Therapy (Respiratory Care)
- A56923Billing and Coding: Outpatient Sleep Studies
- A56923Billing and Coding: Outpatient Sleep Studies
How E66.2 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to E66.2.
- OHS(obesity hypoventilation syndrome)
- Pickwickian syndrome
- Obesity›hypoventilation syndrome(OHS)
- Obesity›with alveolar hypoventilation
- Syndrome›alveolar hypoventilation
- Syndrome›cardiopulmonary-obesity
- Syndrome›hypoventilation, obesity(OHS)
- Syndrome›obesity hypoventilation(OHS)
- Syndrome›Pickwickian
- Obesity›morbid›with›alveolar hypoventilation
- Obesity›morbid›with›obesity hypoventilation syndrome(OHS)
Related codes at this level
Codes that share E66. If E66.2 is not quite right, the correct code is usually one of these.
Questions about E66.2
- Is E66.2 a billable ICD-10-CM code?
- Yes. E66.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does E66.2 sit in the tabular list?
- Endocrine, nutritional and metabolic diseases (E00-E89), in the block Overweight, obesity and other hyperalimentation (E65-E68).