Z68.18
✓ Billable
Body mass index [BMI] 18.4 or less, adult
ICD-10-CM · FY2026 · Factors Influencing Health Status
Code
Z68.18
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Factors Influencing Health Status
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Also known as
- Kilograms per meters squared
Note
- 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)
Frequently asked questions
What is ICD-10 code Z68.18?
ICD-10-CM code Z68.18 represents Body mass index [BMI] 18.4 or less, adult. It is a billable diagnosis code in the Factors Influencing Health Status chapter, effective October 1, 2025 – September 30, 2026.
Is Z68.18 billable?
Yes. Z68.18 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is Z68.18 in?
Z68.18 belongs to the Factors Influencing Health Status chapter (Z00–Z99) of ICD-10-CM.
Related codes in the Z68 category
Z68
Body mass index [BMI]
Non-billable
Z68.1
Body mass index [BMI] 19.9 or less, adult
Non-billable
Z68.2
Body mass index [BMI] 20-29, adult
Non-billable
Z68.3
Body mass index [BMI] 30-39, adult
Non-billable
Z68.4
Body mass index [BMI] 40 or greater, adult
Non-billable
Z68.5
Body mass index [BMI] pediatric
Non-billable
Z68.19
Body mass index [BMI] 18.5-19.9, adult
Billable
Z68.20
Body mass index [BMI] 20.0-20.9, adult
Billable
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