E66.8 ICD-10-CM Code: Other obesity
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Overweight, obesity and other hyperalimentation (E65-E68)
E66.8
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceOther obesity
Other obesity
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for E66.8 in this effective period.
Excludes 2
Official- adiposogenital dystrophy (E23.6)
- lipomatosis dolorosa [Dercum] (E88.2)
- lipomatosis NOS (E88.2)
- Prader-Willi syndrome (Q87.11)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for E66.8 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for E66.8 in this effective period.
Code First
Official- obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
Use Additional
Official- code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-)
Code Also
OfficialICD-10-CM does not list Code Also instructions for E66.8 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
What This Code Means
E66.8 is the ICD-10-CM diagnosis code for other obesity. E66.8 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).
Other obesity, obesity of specified etiology not elsewhere classified. Not an HCC on its own. Use when the provider names a specific non-calorie, non-drug cause.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E66.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Other obesity, obesity of specified etiology not elsewhere classified. Not an HCC on its own. Use when the provider names a specific non-calorie, non-drug cause.
- •Do not default to E66.8 for unspecified obesity, use E66.9 for unspecified. E66.8 requires a named 'other' cause in the documentation.
- •E66.8 does not map to a V28 payment HCC.