ICD-10 E66
Non-Billable HeaderOverweight and obesity
About ICD-10-CM E66
ICD-10-CM code E66 represents Overweight and obesity. This is a non-billable header code in the Endocrine, Nutritional, and Metabolic chapter (block E66). The 2026 edition of ICD-10-CM E66 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Type 2 Excludes
Not included here, the excluded code is not part of E66, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- adiposogenital dystrophy (E23.6)
- lipomatosis dolorosa [Dercum] (E88.2)
- lipomatosis NOS (E88.2)
- Prader-Willi syndrome (Q87.11)
Use Additional Code
When coding E66, also report these additional codes when applicable.
- code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-)
Coding Notes
Code First
- obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
Medicare LCD Coverage for E66
Local Coverage Determinations (LCDs) from CMS MACs that list E66 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing E66.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but E66 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with E66
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To E66
Other codes in section E65-E68 (Overweight, obesity and other hyperalimentation).
ICD-10 E66, Billing FAQ
Is ICD-10 code E66 billable? +
No, E66 is a non-billable header code. Use a more specific child code from block E66 when submitting claims.
What codes are Type 2 Excludes for E66? +
Type 2 Excludes (may be coded together when both conditions exist): adiposogenital dystrophy (E23.6); lipomatosis dolorosa [Dercum] (E88.2); lipomatosis NOS (E88.2)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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