Is ICD-10-CM code E66 billable?

No, E66 (Overweight and obesity) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code E66 belong to?

E66 belongs to Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

E66

Non-Billable

ChapterE00–E89

Rankcategory

Description

Overweight and obesity

About ICD-10-CM code E66

Under E00-E89 Endocrine, Nutritional and Metabolic Diseases, within Overweight, obesity and other hyperalimentation (E65-E68), ICD-10-CM code E66 describes Overweight and obesity. This code cannot be billed directly because more specific child codes exist beneath it.

Use a more specific code (4 billable, 2 non-billable)

E66.0Obesity due to excess calorieshas subcodes E66.1Drug-induced obesity E66.2Morbid (severe) obesity with alveolar hypoventilation E66.3Overweight E66.8Other obesityhas subcodes E66.9Obesity, unspecified

Metadata & Insights

•Non-billable category (requires more specific sub-code).
•Chapter 4: Endocrine, Nutritional and Metabolic Diseases (E00-E89).

CH4 Parent Instructions

Excludes1(Not coded here. Use a different code.)

transitory endocrine and metabolic disorders specific to newborn (P70-P74)

Instructional Notes

Excludes2(Not included here. Code separately if applicable.)

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-)

Clinical Hierarchy

BillableHas subcodes

CH4Endocrine, nutritional and metabolic diseases (E00-E89)

E65-E68Overweight, obesity and other hyperalimentation (E65-E68)

E66Overweight and obesityNot billable

E66.0Obesity due to excess caloriesSubcodes

E66.1Drug-induced obesityBillable

E66.2Morbid (severe) obesity with alveolar hypoventilationBillable

E66.3OverweightBillable

E66.8Other obesitySubcodes

E66.9Obesity, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to E66:

chapterCH4

Endocrine, nutritional and metabolic diseases (E00-E89)

View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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