DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

E66.09 diagnosis code · Billable code · FY2027

E66.09 Other obesity due to excess calories

  • Billable
  • Not CC/MCC
  • POA reported

E66.09 ICD-10 code: a billable diagnosis code in FY2027, one of 10 billable codes in category E66.

Where it sits

  1. Chapter 4 Endocrine, nutritional and metabolic diseases (E00-E89)
  2. E65-E68 Overweight, obesity and other hyperalimentation (E65-E68)
  3. E66 Overweight and obesity
  4. E66.0 Obesity due to excess calories
  5. E66.09 Other obesity due to excess calories
CC / MCC
Neither
MS-DRG
640-641
HCC V28
–
POA
Reported
Code Editor
Questionable adm.
Index entries
3

Instructions

Notes that also apply

Excludes2 from E66

  • adiposogenital dystrophy (E23.6) E23.6
  • lipomatosis dolorosa [Dercum] (E88.2) E88.2
  • lipomatosis NOS (E88.2) E88.2
  • Prader-Willi syndrome (Q87.11) Q87.11

Code first from E66

  • obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-) O99.21

Use additional code from E66

  • code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-) Z68.1 Z68.45 Z68.5

Chapter 4 instructions (Notes 1, Excludes1 1): printed on the chapter 4 page.

Index entries

  • Obesityexogenous → E66.09
  • Obesitynutritional → E66.09
  • Obesitydue toexcess calories → E66.09

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for E66.09
CC / MCCNeither
Appendix BMDC 10 Endocrine, Nutritional and Metabolic Diseases and Disorders, MS-DRG 640-641 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC…)
Code EditorQuestionable admission when principal diagnosis
POAReported
HCC V28–

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.

Hierarchy