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  5. Body mass index [BMI] (Z68)

Body mass index (BMI) (Z68)

ICD-10 Code Z68 is used to document a person’s body mass index (BMI), an important measure that reflects body fat based on height and weight. This range includes specific BMI categories for adults and children to assist in clinical assessments and health management.

The codes in the Z68 category detail BMI values across various ranges. For adults, codes like Z68.1 indicate BMIs under 20, reflecting a below-normal or decreased body mass index, while Z68.2 covers BMI from 20 to 29, a range considered normal or overweight. Higher BMI codes such as Z68.3 and Z68.4 specifically target obesity, with subdivisions for classes of obesity (e.g., 30.0 to over 70). For example, Z68.41 corresponds to a BMI of 40.0 to 44.9, often referred to as severely obese or increased BMI. Pediatric BMI codes, from Z68.5 onwards, classify BMI percentiles relative to age groups, identifying children whose BMI is below the 5th percentile or exceeding the 95th percentile, indicating underweight or obesity status respectively. This detailed coding system helps healthcare professionals accurately record body composition status to guide diagnosis and treatment plans.

  • Factors influencing health status and contact with health services (Z00–Z99)

    • Body mass index (BMI) (Z68)

        • Body mass index [BMI] (Z68)

        • Z68 Body mass index [BMI]
        • Z68.1 Body mass index [BMI] 19.9 or less, adult
        • Z68.2 Body mass index [BMI] 20-29, adult
        • Z68.20 Body mass index [BMI] 20.0-20.9, adult
        • Z68.21 Body mass index [BMI] 21.0-21.9, adult
        • Z68.22 Body mass index [BMI] 22.0-22.9, adult
        • Z68.23 Body mass index [BMI] 23.0-23.9, adult
        • Z68.24 Body mass index [BMI] 24.0-24.9, adult
        • Z68.25 Body mass index [BMI] 25.0-25.9, adult
        • Z68.26 Body mass index [BMI] 26.0-26.9, adult
        • Z68.27 Body mass index [BMI] 27.0-27.9, adult
        • Z68.28 Body mass index [BMI] 28.0-28.9, adult
        • Z68.29 Body mass index [BMI] 29.0-29.9, adult
        • Z68.3 Body mass index [BMI] 30-39, adult
        • Z68.30 Body mass index [BMI] 30.0-30.9, adult
        • Z68.31 Body mass index [BMI] 31.0-31.9, adult
        • Z68.32 Body mass index [BMI] 32.0-32.9, adult
        • Z68.33 Body mass index [BMI] 33.0-33.9, adult
        • Z68.34 Body mass index [BMI] 34.0-34.9, adult
        • Z68.35 Body mass index [BMI] 35.0-35.9, adult
        • Z68.36 Body mass index [BMI] 36.0-36.9, adult
        • Z68.37 Body mass index [BMI] 37.0-37.9, adult
        • Z68.38 Body mass index [BMI] 38.0-38.9, adult
        • Z68.39 Body mass index [BMI] 39.0-39.9, adult
        • Z68.4 Body mass index [BMI] 40 or greater, adult
        • Z68.41 Body mass index [BMI] 40.0-44.9, adult
        • Z68.42 Body mass index [BMI] 45.0-49.9, adult
        • Z68.43 Body mass index [BMI] 50.0-59.9, adult
        • Z68.44 Body mass index [BMI] 60.0-69.9, adult
        • Z68.45 Body mass index [BMI] 70 or greater, adult
        • Z68.5 Body mass index [BMI] pediatric
        • Z68.51 Body mass index [BMI] pediatric, less than 5th percentile for age
        • Z68.52 Body mass index [BMI] pediatric, 5th percentile to less than 85th percentile for age
        • Z68.53 Body mass index [BMI] pediatric, 85th percentile to less than 95th percentile for age
        • Z68.54 Body mass index [BMI] pediatric, 95th percentile for age to less than 120% of the 95th percentile for age UPDATED CODE
        • Z68.55 Body mass index [BMI] pediatric, 120% of the 95th percentile for age to less than 140% of the 95th percentile for age NEW CODE
        • Z68.56 Body mass index [BMI] pediatric, greater than or equal to 140% of the 95th percentile for age NEW CODE

Instructional Notations

Inclusion Terms

These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.

  • Kilograms per meters squared

  • BMI adult codes are for use for persons 20 years of age or older
  • BMI pediatric codes are for use for persons 2-19 years of age.
  • These percentiles are based on the growth charts published by the Centers for Disease Control and Prevention (CDC)

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Body Mass Index

An indicator of body density as determined by the relationship of BODY WEIGHT to BODY HEIGHT. BMI=weight (kg)/height squared (m2). BMI correlates with body fat (ADIPOSE TISSUE). Their relationship varies with age and gender. For adults, BMI falls into these categories: below 18.5 (underweight); 18.5-24.9 (normal); 25.0-29.9 (overweight); 30.0 and above (obese). (National Center for Health Statistics, Centers for Disease Control and Prevention)

Obesity Paradox

An observation that high BODY MASS INDEX is sometimes associated with lower CARDIOVASCULAR DISEASE mortality in certain population, e.g., ELDERLY.