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    v1.0.28
    OpenPayerBilling CodesOverweight, obesity and other hyperalimentationICD-10-CM e66-overweight-and-obesity
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    ICD-10-CM Code For Overweight And Obesity: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group E66 includes diagnoses for overweight, obesity, and other forms of hyperalimentation covering excess body weight conditions such as overweight, obesity by body mass index categories, and specified types like drug-induced or morbid obesity. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving excess adiposity, related metabolic complications, and severity levels that may affect treatment decisions. Accurate coding within the ICD-10-CM E66 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM E66: Overweight And Obesity Overview

    The diagnoses in this group represent excess body fat conditions ranging from overweight to various forms of obesity and hyperalimentation. These conditions primarily affect the metabolic and endocrine systems and are documented using body mass index and related clinical findings. Accurate coding matters for reimbursement because it captures disease severity and comorbidities that influence payment and care planning.

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    When to Use

    Use a code from this group when a clinician documents overweight, obesity, or other hyperalimentation as part of the patient’s medical record. Select the specific code that reflects the documented type and severity, including any noted causative factors or associated complications.

    ICD-10-CM Codes

    10 rows

    ICD-10-CM CodeDescription
    E66.01Morbid (severe) obesity due to excess calories
    E66.09Other obesity due to excess calories
    E66.1Drug-induced obesity
    E66.2Morbid (severe) obesity with alveolar hypoventilation
    E66.3Overweight
    E66.811Obesity, class 1
    E66.812Obesity, class 2
    E66.813Obesity, class 3
    E66.89Other obesity not elsewhere classified
    E66.9Obesity, unspecified

    DRG Codes

    4 rows

    DRG CodeDescription
    205Other Respiratory System Diagnoses with MCC
    206Other Respiratory System Diagnoses without MCC
    640Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC
    641Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC

    Typical Clinical Scenarios

    • A middle-aged adult presents to primary care for routine management of type 2 diabetes and reports difficulty losing weight despite lifestyle changes; body mass index (BMI) is measured at 36 kg/m2 with no acute complaints, and the encounter documents chronic excess adiposity contributing to metabolic risk, so an obesity diagnosis is assigned. Typical codes: E66.01, E66.9
    • A pediatric patient is brought to a clinic because of rapid weight gain and concerns about early puberty; growth charts show BMI at the 98th percentile for age, and the visit focuses on assessment and counseling for overweight/obesity impacting development, prompting use of a pediatric obesity code. Typical codes: E66.09, E66.1
    • An adult presents to the emergency department with acute shortness of breath and hypoxia, where obesity is noted as an important comorbidity complicating respiratory status and management; documentation of obesity as a contributing factor to the acute presentation leads to coding of obesity as a comorbid condition. Typical codes: E66.89, E66.9

    Related Codes

    E65-LOCALIZED-ADIPOSITY

    ICD-10-CM Code For Localized Adiposity: Group Overview

    E67-OTHER-HYPERALIMENTATION

    ICD-10-CM Code For Other Hyperalimentation: Group Overview

    E68-SEQUELAE-OF-HYPERALIMENTATION

    ICD-10-CM Code For Sequelae Of Hyperalimentation: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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