ICD-10 Diagnosis Code E66.9

Obesity, unspecified

Diagnosis Code E66.9

ICD-10: E66.9
Short Description: Obesity, unspecified
Long Description: Obesity, unspecified
This is the 2018 version of the ICD-10-CM diagnosis code E66.9

Valid for Submission
The code E66.9 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Endocrine, nutritional and metabolic diseases (E00–E90)
    • Overweight, obesity and other hyperalimentation (E65-E68)
      • Overweight and obesity (E66)

Information for Medical Professionals

Code Edits
The following edits are applicable to this code:
Questionable admission codes Additional informationCallout TooltipQuestionable admission codes
Some diagnoses are not usually sufficient justification for admission to an acute care hospital. For example, if a patient is given code R030 for elevated blood pressure reading, without diagnosis of hypertension, then the patient would have a questionable admission, since elevated blood pressure reading is not normally sufficient justification for admission to a hospital.

Diagnostic Related Groups
The diagnosis code E66.9 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Body mass index 30+ - obesity
  • Diabetes mellitus type 2 in obese
  • Excess subcutaneous fat
  • Generalized obesity
  • Impaired glucose tolerance in obese
  • Increased body mass index
  • Lifelong obesity
  • Lymphedema associated with obesity
  • Obese
  • Obese
  • Obese
  • Obese
  • Obese class I
  • Obese class II
  • Obesity
  • Obesity associated disorder
  • Obesity by adipocyte growth pattern
  • Obesity by age of onset
  • Obesity by contributing factors
  • Obesity by fat distribution pattern
  • Obesity in mother complicating childbirth
  • On examination - obese
  • On examination - overweight
  • On examination - weight
  • Simple obesity

Index of Diseases and Injuries
References found for the code E66.9 in the Index of Diseases and Injuries:

Information for Patients


Obesity means having too much body fat. It is different from being overweight, which means weighing too much. The weight may come from muscle, bone, fat, and/or body water. Both terms mean that a person's weight is greater than what's considered healthy for his or her height.

Obesity occurs over time when you eat more calories than you use. The balance between calories-in and calories-out differs for each person. Factors that might affect your weight include your genetic makeup, overeating, eating high-fat foods, and not being physically active.

Being obese increases your risk of diabetes, heart disease, stroke, arthritis, and some cancers. If you are obese, losing even 5 to 10 percent of your weight can delay or prevent some of these diseases. For example, that means losing 10 to 20 pounds if you weigh 200 pounds.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

  • Body mass index (Medical Encyclopedia)
  • Health risks of obesity (Medical Encyclopedia)
  • Obesity (Medical Encyclopedia)
  • Obesity hypoventilation syndrome (OHS) (Medical Encyclopedia)

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