E66.9 — Obesity, unspecified
E66.9 is a billable, specific ICD-10-CM code for obesity, unspecified. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Obesity NOS
Excludes2 inherited from the categories above E66.9
Also inherited, and the opposite of Excludes1: these conditions are not part of E66.9, but a patient can have both, so you may code both.
Other codes that can never be billed with E66.9
These codes carry an Excludes1 note pointing at E66.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E66.9 alone.
- R63.5Abnormal weight gain
Risk adjustment
E66.9 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.
Medicare coverage
E66.9 is named in 10 Medicare coverage policies — 10 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A57065Billing and Coding: Outpatient Psychiatry and Psychology Services
- A57179Billing and Coding: Transesophageal Echocardiogram
- A60204Billing and Coding: MolDX: Biomarker Testing for Risk Stratification in Metabolic Dysfunction-Associated Steatotic Liver Disease and Metabolic Dysfunction-Associated Steatohepatitis
- A60205Billing and Coding: MolDX: Biomarker Testing in Metabolic Dysfunction-Associated Steatotic Liver Disease and Metabolic Dysfunction-Associated Steatohepatitis
How E66.9 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 E66.9.
- Obesity
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
E66.9 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share E66. If E66.9 is not quite right, the correct code is usually one of these.
Questions about E66.9
- Is E66.9 a billable ICD-10-CM code?
- Yes. E66.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does E66.9 sit in the tabular list?
- Endocrine, nutritional and metabolic diseases (E00-E89), in the block Overweight, obesity and other hyperalimentation (E65-E68).