What is the ICD-10-CM code for obesity?

The primary ICD-10-CM code for obesity is E66.9 (Obesity, unspecified). There are 11 billable obesity codes in FY2027, covering different types and underlying causes.

How many ICD-10-CM codes are there for obesity?

There are 15 ICD-10-CM codes for obesity in the FY2027 tabular list, of which 11 are billable. These codes fall under Chapter 4 of the ICD-10-CM classification.

Which chapter covers obesity in ICD-10-CM?

Obesity codes are classified in Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

Obesity ICD-10-CM codes

ICD-10-CM codes for overweight and obesity, including morbid (severe) obesity and obesity with alveolar hypoventilation.

15 codes, 11 billable. FY2027, valid from October 1, 2026. In chapter 4: Endocrine, Nutritional and Metabolic Diseases.

How to code Obesity

Category E66 includes E66.01 (morbid obesity due to excess calories), E66.2 (morbid obesity with alveolar hypoventilation, also called obesity hypoventilation syndrome), and E66.9 (obesity, unspecified).

Always add a BMI code from category Z68 when the BMI is documented. BMI may be taken from any clinician's documentation (such as nursing notes), but the obesity diagnosis itself must come from the provider.

Obesity is always clinically significant and reportable when documented, per Coding Clinic guidance, even without active treatment during the encounter.

All Obesity codes

More Condition Guides

Diabetes Mellitus Hypertension Pneumonia COPD Asthma Chronic Kidney Disease Heart Failure Atrial Fibrillation Sepsis GERD Urinary Tract Infection Stroke (Cerebral Infarction)All 335 guides