E66.0 ICD-10-CM Code: Obesity due to excess calories
E66.0 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Overweight, obesity and other hyperalimentation (E65-E68)
E66.0
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceObesity due to excess calories
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for E66.0. Check the code and parent instructions in the Code Book.
Excludes 2
Official- adiposogenital dystrophy (E23.6)Inherited from E66
- lipomatosis dolorosa [Dercum] (E88.2)Inherited from E66
- lipomatosis NOS (E88.2)Inherited from E66
- Prader-Willi syndrome (Q87.11)Inherited from E66
Related Codes
Includes
OfficialNo Includes notes are included in this display for E66.0. Check the code and parent instructions in the Code Book.
Excludes 1
Official- transitory endocrine and metabolic disorders specific to newborn (P70-P74)Inherited from E00-E89
Code First
Official- obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)Inherited from E66
Use Additional
Official- code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-)Inherited from E66
Code Also
OfficialNo Code Also instructions are included in this display for E66.0. Check the code and parent instructions in the Code Book.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- E66.0
- Description
- Obesity due to excess calories
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
E66.0 is the ICD-10-CM diagnosis code for obesity due to excess calories. E66.0 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering overweight, obesity and other hyperalimentation (e65-e68).
Header codes like E66.0 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for E66.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.