E66.0 ICD-10-CA code: Obesity due to excess calories
E66.0 is the ICD-10-CA code for “Obesity due to excess calories” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
E66.0Obesity due to excess calories
ICD-10-CA · Canada · Also written E660
Index terms
Entries in CIHI’s alphabetical index that lead to E66.0. Searching the index by the condition the note names is how coders reach this code.
- Obesity (simple), exogenous
- Obesity (simple), nutritional
- Obesity (simple), due to, excess calories
- Obesity (simple), due to, overalimentation
Notes for E66.0
As CIHI prints them, with any note E66.0 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Adiposogenital dystrophy (E23.6)lipomatosis:• NOS (E88.2)• dolorosa [Dercum] (E88.2)Prader-Willi syndrome (Q87.1)From E66 Obesity
- Complications of pregnancy, childbirth and the puerperium (O00-O99)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)transitory endocrine and metabolic disorders specific to fetus and newborn (P70-P74)From Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
Note
- All neoplasms, whether functionally active or not, are classified in Chapter II. Appropriate codes in this chapter (i.e. E05.8)(E07.0) (E16-E31)(E34.-) may be used, if desired, as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.From Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
Where E66.0 sits
- 1ChapterChapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
- 2Block E65-E68Obesity and other hyperalimentation
- 3Category E66Obesity
- 4Valid code E66.0Obesity due to excess calories
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code E66.0 mean?
E66.0 is the ICD-10-CA code for “Obesity due to excess calories” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is E66.0 in ICD-10-CA?
E66.0 sits under E66 Obesity, within E65-E68 Obesity and other hyperalimentation, within Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90).
What coding notes apply to E66.0?
ICD-10-CA lists Excludes, Note notes for E66.0, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.