E66.3 ICD-10-CM Code: Overweight
HCC Buddy Code Card
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Overweight, obesity and other hyperalimentation (E65-E68)
E66.3
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOverweight
Being overweight but not obese, typically defined as a BMI between 25 and 29.9.
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 E66.3 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 E66.3 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for E66.3 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 E66.3 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.
Is E66.3 an HCC code?
No. E66.3 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
E66.3 is the ICD-10-CM diagnosis code for overweight. Being overweight but not obese, typically defined as a BMI between 25 and 29.9. E66.3 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).
E66.3 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
This code is distinct from obesity codes; use when BMI indicates overweight status only.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E66.3 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code is distinct from obesity codes; use when BMI indicates overweight status only
- •Document BMI when available to support code selection