All ICD10 Codes

E66

Non-Billable
ChapterE00–E89
Rankcategory
Official Description

Overweight and obesity

Use a more specific code (4 billable, 2 non-billable)
E66.0Obesity due to excess calorieshas subcodesE66.1Drug-induced obesityE66.2Morbid (severe) obesity with alveolar hypoventilationE66.3OverweightE66.8Other obesityhas subcodesE66.9Obesity, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 4: Endocrine, Nutritional and Metabolic Diseases (E00-E89).

CH4 Parent Instructions

Excludes1(Not coded here. Use a different code.)
  • transitory endocrine and metabolic disorders specific to newborn (P70-P74)

Instructional Notes

Excludes2(Not included here. Code separately if applicable.)
  • 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

BillableHas subcodes
CH4Endocrine, nutritional and metabolic diseases (E00-E89)
E65-E68Overweight, obesity and other hyperalimentation (E65-E68)
E66Overweight and obesityNot billable
E66.0Obesity due to excess caloriesSubcodes
E66.1Drug-induced obesityBillable
E66.2Morbid (severe) obesity with alveolar hypoventilationBillable
E66.3OverweightBillable
E66.8Other obesitySubcodes
E66.9Obesity, unspecifiedBillable

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

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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