E66: Overweight and obesity
Codes under E66 (Overweight and obesity). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| E66.0 | Obesity due to excess calories | — |
| E66.0 | Obesity due to excess calories | — |
| E66.01 | Morbid (severe) obesity due to excess calories | ✓ |
| E66.01 | Morbid (severe) obesity due to excess calories | ✓ |
| E66.1 | Drug-induced obesity | ✓ |
| E66.1 | Drug-induced obesity | ✓ |
| E66.2 | Morbid (severe) obesity with alveolar hypoventilation | ✓ |
| E66.2 | Morbid (severe) obesity with alveolar hypoventilation | ✓ |
| E66.3 | Overweight | ✓ |
| E66.3 | Overweight | ✓ |
| E66.8 | Other obesity | — |
| E66.8 | Other obesity | — |
| E66.09 | Other obesity due to excess calories | ✓ |
| E66.09 | Other obesity due to excess calories | ✓ |
| E66.9 | Obesity, unspecified | ✓ |
| E66.9 | Obesity, unspecified | ✓ |
| E66.81 | Obesity class | — |
| E66.81 | Obesity class | — |
| E66.89 | Other obesity not elsewhere classified | ✓ |
| E66.89 | Other obesity not elsewhere classified | ✓ |
| E66.811 | Obesity, class 1 | ✓ |
| E66.811 | Obesity, class 1 | ✓ |
| E66.812 | Obesity, class 2 | ✓ |
| E66.812 | Obesity, class 2 | ✓ |
| E66.813 | Obesity, class 3 | ✓ |
| E66.813 | Obesity, class 3 | ✓ |
Frequently asked questions
What is ICD-10-CM code E66?
E66 is an ICD-10-CM category covering Overweight and obesity. It contains 26 more specific diagnosis codes, 20 of which are billable.
Is E66 a billable code?
No — E66 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example E66.0 — Obesity due to excess calories). 20 of the 26 codes under E66 are billable.
What codes fall under E66?
E66 includes E66.0, E66.0, E66.01, E66.01, E66.1, plus 21 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free