Z68.31 Body mass index [BMI] 31.0-31.9, adult

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from Z68 Body mass index [BMI]

Applicable to

• Kilograms per meters squared

Notes

• 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)

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Approximate ICD-9-CM (GEMs)

• V85.31 Body Mass Index 31.0-31.9, adult

Medicare Code Edits (MCE v43.1 (April 2026))

• Adult diagnoses (age 15 through 124): Age conflict edit. These diagnoses are clinically expected only in patients age 15 through 124.
• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to Z68.31

Back-references to Z68

• Use Additional: E88.82 Obesity due to disruption of MC4R pathway ("code to identify body mass index (BMI), if known (Z68.-)")
• Use Additional: R63.6 Underweight ("code to identify body mass index (BMI), if known (Z68.-)")
• Use Additional: Z15.2 Genetic susceptibility to obesity ("code to identify body mass index (BMI), if known (Z68.-)")
• Use Additional: Z71.3 Dietary counseling and surveillance ("code to identify body mass index (BMI), if known (Z68.-)")

Diagnosis Index entries for Z68.31

• Body, bodies › mass index (BMI) › adult › 31.0-31.9

Nearby codes

• 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 (this code)
• 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