ICD-10-CM
ICD-10 code for Obesity nutritional: E66.09
The ICD-10-CM index points "Obesity nutritional" to E66.09, Other obesity due to excess calories. E66.09 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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More specific codes in E66
A header groups codes and is not billed. A billable code is one you can report.
- E66Overweight and obesityHeader
- E66.0Obesity due to excess caloriesHeader
- E66.01Morbid (severe) obesity due to excess caloriesBillable
- E66.09Other obesity due to excess caloriesBillable
- E66.1Drug-induced obesityBillable
- E66.2Morbid (severe) obesity with alveolar hypoventilationBillable
- E66.3OverweightBillable
- E66.8Other obesityHeader
- E66.81Obesity classHeader
- E66.811Obesity, class 1Billable
- E66.812Obesity, class 2Billable
- E66.813Obesity, class 3Billable
- E66.89Other obesity not elsewhere classifiedBillable
- E66.9Obesity, unspecifiedBillable
Code first
The CDC tabular list says to report the code named here before this one.
From E66. A note on a category applies to every code under it.
Code first obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
Use additional code
The CDC tabular list says to add the code named here after this one when it applies.
From E66. A note on a category applies to every code under it.
Use additional code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-)
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From E66. A note on a category applies to every code under it.
Related conditions
Related pages
- E66.09 code detailsNotes, nearby codes, CMS-HCC group
- Category E66Every code under it
- Chapter 4Endocrine, nutritional and metabolic diseases
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Obesity nutritional?
The ICD-10-CM index points "Obesity nutritional" to E66.09, Other obesity due to excess calories. E66.09 is a billable code.
Is E66.09 billable?
Yes. E66.09 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to E66.09?
The CDC tabular list gives 4 Excludes2 notes (may be coded together when both are documented), 1 "use additional code" note for E66.09 and the categories above it. They are listed on this page.
What chapter is E66.09 in?
Chapter 4. Endocrine, nutritional and metabolic diseases.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.