---
title: "ICD-10-CM E66.811: Obesity, class 1 | BillingBrief"
description: "ICD-10-CM code E66.811: Obesity, class 1. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/e66.811/"
language: "en"
---

# E66.811 Obesity, class 1

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Obesity, class 1

## Related codes

-   [`E66.01` Morbid (severe) obesity due to excess calories ICD-10-CM](https://billingbrief.com/icd10/e66.01/)
-   [`E66.09` Other obesity due to excess calories ICD-10-CM](https://billingbrief.com/icd10/e66.09/)
-   [`E66.1` Drug-induced obesity ICD-10-CM](https://billingbrief.com/icd10/e66.1/)
-   [`E66.2` Morbid (severe) obesity with alveolar hypoventilation ICD-10-CM](https://billingbrief.com/icd10/e66.2/)
-   [`E66.3` Overweight ICD-10-CM](https://billingbrief.com/icd10/e66.3/)
-   [`E66.812` Obesity, class 2 ICD-10-CM](https://billingbrief.com/icd10/e66.812/)
-   [`E66.813` Obesity, class 3 ICD-10-CM](https://billingbrief.com/icd10/e66.813/)
-   [`E66.89` Other obesity not elsewhere classified ICD-10-CM](https://billingbrief.com/icd10/e66.89/)

## Common questions

### Is E66.811 a billable code?

Yes. E66.811 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

E66 Overweight and obesity

Chapter

Endocrine, nutritional and metabolic diseases

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).