All ICD10 Codes

E66

Non-Billable
ChapterE00–E89
Rankcategory
Official Description

Overweight and obesity

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 4: Endocrine, Nutritional and Metabolic Diseases (E00-E89).

CH4 Parent Instructions

Excludes1(Not coded here)
  • transitory endocrine and metabolic disorders specific to newborn (P70-P74)

Instructional Notes

Excludes2(Not included here)
  • adiposogenital dystrophy (E23.6)
  • lipomatosis dolorosa [Dercum] (E88.2)
  • lipomatosis NOS (E88.2)
  • Prader-Willi syndrome (Q87.11)
Code First
  • obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
Use Additional Code
  • code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-)

Clinical Hierarchy

CH4Endocrine, nutritional and metabolic diseases (E00-E89)
E65-E68Overweight, obesity and other hyperalimentation (E65-E68)
E66Overweight and obesity
E66.0Obesity due to excess calories
E66.1Drug-induced obesity
E66.2Morbid (severe) obesity with alveolar hypoventilation
E66.3Overweight
E66.8Other obesity
E66.9Obesity, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to E66:

chapterCH4
Endocrine, nutritional and metabolic diseases (E00-E89)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to E66. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths
Obesity24 unique routes
Direct index entry→E66
class(3 variants)
1→E66
2→E66
3→E66
constitutional→E66
drug-induced→E66
due to(4 variants)
drug→E66
excess calories→E66(3 variants)
morbid→E66
severe→E66
endocrine→E66
endogenous→E66
exogenous→E66
familial→E66
glandular→E66
hypoventilation syndrome (OHS)→E66
morbid→E66(4 variants)
due to excess calories→E66
with(2 variants)
alveolar hypoventilation→E66
obesity hypoventilation syndrome (OHS)→E66
nutritional→E66
severe→E66
specified type NEC→E66
with alveolar hypoventilation→E66
OHS (obesity hypoventilation syndrome)1 unique routes
Direct index entry→E66

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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