E66.9

Billable
ChapterE00–E89
Ranksubcategory
Official Description

Obesity, unspecified

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 4: Endocrine, Nutritional and Metabolic Diseases (E00-E89).

Instructional Notes

Includes
  • Obesity NOS
General instructions are available for the parent sections:
View CH4 NotesView E66 Notes

Clinical Hierarchy

CH4Endocrine, nutritional and metabolic diseases (E00-E89)
E65-E68Overweight, obesity and other hyperalimentation (E65-E68)
E66Overweight and obesity
E66.9Obesity, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to E66.9:

categoryE66
Overweight and obesity
View context instructions
chapterCH4
Endocrine, nutritional and metabolic diseases (E00-E89)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to E66.9. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

1 raw paths
Obesity1 unique routes
Direct index entry→E66.9

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 640
Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC
DRG 641
Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC

Cross Reference

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