E66.81
⚠ Non-billable (Header)Obesity class
Endocrine, nutritional and metabolic diseases (E00-E89)
⚠️ This is a category header code — not billable. Use a more specific child code below.
⚠️ Excludes2
inheritedRules inherited from parent codes.
- • adiposogenital dystrophy (E23.6)
- • lipomatosis dolorosa [Dercum] (E88.2)
- • lipomatosis NOS (E88.2)
- • Prader-Willi syndrome (Q87.11)
📋 Code Instructions
inherited- • code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-)
- • Code first: obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-)
Clinical Description
ICD-10-CM code E66.81 represents obesity class. This code falls under the Endocrine, nutritional and metabolic diseases (E00-E89) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.
This is a 6-character code at the 5th level of specificity. There are 3 more specific child codes under E66.81.
Frequently Asked Questions
What is ICD-10 code E66.81?
ICD-10-CM code E66.81 is "Obesity class". It belongs to the category: Endocrine, nutritional and metabolic diseases (E00-E89).
Is E66.81 a billable ICD-10 code?
No, E66.81 is a non-billable header code. A more specific child code must be used for billing.
Can E66.81 be coded with other codes?
E66.81 has 4 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
Related Codes in E66.8
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)