ICD-10-CM E66: Overweight and obesity

ICD-10-CM Diagnosis Code (2025)

Official Description for E66

Overweight and obesity

Coding Notes & Guidelines for E66

Excludes1: Not Coded Here

morbid (severe) obesity with alveolar hypoventilation (E66.2)

Excludes2: Not Included Here
  • adiposogenital dystrophy (E23.6)
  • lipomatosis dolorosa [Dercum] (E88.2)
  • lipomatosis NOS (E88.2)
  • Prader-Willi syndrome (Q87.11)
Code First

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

Use Additional Code

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

Use Additional Code

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Inclusion Terms
  • Obesity hypoventilation syndrome (OHS)
  • Pickwickian syndrome
Inclusion Terms

Obesity NOS

Child Codes (More Specific Codes for E66):

E66.0 - Obesity due to excess calories E66.01 - Morbid (severe) obesity due to excess calories E66.09 - Other obesity due to excess calories E66.1 - Drug-induced obesity E66.2 - Morbid (severe) obesity with alveolar hypoventilation E66.3 - Overweight E66.8 - Other obesity E66.81 - Obesity class E66.811 - Obesity, class 1 E66.812 - Obesity, class 2 E66.813 - Obesity, class 3 E66.89 - Other obesity not elsewhere classified E66.9 - Obesity, unspecified

About ICD-10-CM Code E66 (Overweight and obesity)

ICD-10-CM code E66 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM E66 became effective on October 1, 2024.

This page provides detailed information about E66 - Overweight and obesity. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Overweight and obesity.