E66 — Overweight and obesity
E66 is a non-billable header ICD-10-CM code for overweight and obesity. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
Code first
The underlying condition must be sequenced before this code.
- obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
Use additional code
Add a secondary code to capture the detail described below.
Other codes that can never be billed with E66
These codes carry an Excludes1 note pointing at E66. 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 alone.
Risk adjustment
E66 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
The condition this code belongs to
Every code for the condition on one page, which one applies when, and the mistake coders make with it.
Code history
E66 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Code to one of these instead E66
6 child codes. Green means billable.
Questions about E66
- Is E66 a billable ICD-10-CM code?
- No. E66 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does E66 sit in the tabular list?
- Endocrine, nutritional and metabolic diseases (E00-E89), in the block Overweight, obesity and other hyperalimentation (E65-E68).