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    OpenPayerBilling CodesBody mass index [BMI]ICD-10-CM z68-body-mass-index-classification
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    ICD-10-CM Code For Body Mass Index [BMI]: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group Z68 includes codes that specify body mass index values and classifications such as underweight, normal weight, overweight, and various classes of obesity and extreme obesity. These ICD-10-CM diagnosis codes are used to document a patient’s weight status and related nutritional assessment, capturing clinical complexity and risk stratification relevant to body mass. Accurate coding within the ICD-10-CM Z68 group supports proper claim adjudication and complete clinical documentation for patient care and reimbursement.

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    ICD-10-CM Z68: Body Mass Index [BMI] Overview

    The ICD-10-CM Z68 code group represents body mass index measurements and classifications used to describe a patient's weight status relative to height. These codes target nutritional and anthropometric assessment rather than a disease affecting a specific organ system. Accurate coding matters for appropriate claim processing and to reflect clinical severity and risk factors that affect reimbursement.

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    When to Use

    Use a code from this group when a documented body mass index value or BMI category is recorded in the clinical record. These codes are applied to reflect nutritional status and associated risk when BMI is relevant to care, treatment planning, or billing.

    ICD-10-CM Codes

    32 rows

    ICD-10-CM CodeDescription
    Z68.1Body mass index [BMI] 19.9 or less, adult
    Z68.20Body mass index [BMI] 20.0-20.9, adult
    Z68.21Body mass index [BMI] 21.0-21.9, adult
    Z68.22Body mass index [BMI] 22.0-22.9, adult
    Z68.23Body mass index [BMI] 23.0-23.9, adult
    Z68.24Body mass index [BMI] 24.0-24.9, adult
    Z68.25Body mass index [BMI] 25.0-25.9, adult
    Z68.26Body mass index [BMI] 26.0-26.9, adult
    Z68.27Body mass index [BMI] 27.0-27.9, adult
    Z68.28Body mass index [BMI] 28.0-28.9, adult
    Z68.29Body mass index [BMI] 29.0-29.9, adult
    Z68.30Body mass index [BMI] 30.0-30.9, adult
    Z68.31Body mass index [BMI] 31.0-31.9, adult
    Z68.32Body mass index [BMI] 32.0-32.9, adult
    Z68.33Body mass index [BMI] 33.0-33.9, adult
    Z68.34Body mass index [BMI] 34.0-34.9, adult
    Z68.35Body mass index [BMI] 35.0-35.9, adult
    Z68.36Body mass index [BMI] 36.0-36.9, adult
    Z68.37Body mass index [BMI] 37.0-37.9, adult
    Z68.38Body mass index [BMI] 38.0-38.9, adult

    Showing 1–20 of 32

    DRG Codes

    3 rows

    DRG CodeDescription
    640Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC
    641Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC
    951Other Factors Influencing Health Status

    Typical Clinical Scenarios

    • An adult patient presents to primary care for routine annual physical; height and weight are measured and BMI is calculated at 22.5 kg/m2, indicating normal body mass. The clinician documents BMI to track growth or weight trends and to support preventive counseling; a BMI-specific diagnosis code is assigned to record the measured BMI value. Typical codes: Z68.21
    • A pregnant patient attends prenatal care and is measured with a BMI of 31.2 kg/m2, meeting criteria for obesity class 1 in pregnancy; the visit is for prenatal management and counseling about weight-related risks. The provider records the pregnant patient’s BMI to guide obstetric risk assessment and care planning, so a pregnancy-appropriate BMI category code is assigned. Typical codes: Z68.31, Z68.41
    • An adolescent is evaluated in the emergency department after a sports-related injury; height and weight are obtained and BMI is calculated at 18.9 kg/m2, which is within the expected percentile for age and sex. Because BMI-for-age category is documented as part of the clinical assessment and contributes to treatment planning, an age-appropriate BMI code is reported. Typical codes: Z68.20, Z68.51

    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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