Z68.18: Body mass index [BMI] 18.4 or less, adult

New code · FY2027

Billable: use this code on claims.

• New code, effective October 1, 2026 (FY2027). Before that, this condition was coded as Z68.1.

Code breakdown

Coding notes

Inclusion terms (from Z68)

• Kilograms per meters squared

Notes (from Z68)

• 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)

Medicare coverage

Z68.18 is listed as a covered diagnosis in 7 Medicare billing and coding articles:

• A56938 Billing and Coding: Hypoglossal Nerve Stimulation for the Treatment of Obstructive Sleep Apnea
• A56953 Billing and Coding: Hypoglossal Nerve Stimulation for the Treatment of Obstructive Sleep Apnea
• A57092 Billing and Coding: Hypoglossal Nerve Stimulation for Treatment of Obstructive Sleep Apnea
• A57149 Billing and Coding: Hypoglossal Nerve Stimulation for Treatment of Obstructive Sleep Apnea
• A57944 Billing and Coding: Hypoglossal Nerve Stimulation for Treatment of Obstructive Sleep Apnea
• A57948 Billing and Coding: Hypoglossal Nerve Stimulation for the Treatment of Obstructive Sleep Apnea
• A58075 Billing and Coding: Hypoglossal Nerve Stimulation for Obstructive Sleep Apnea

Check this code

• Code search: full entry and nearby codes
• Excludes checker: can it be billed with another code?
• Coverage checker: is it covered for your CPT code?

All FY2027 ICD-10-CM changes

ICD-10-CM codes and descriptions are from the CMS and NCHS code files. Coverage is from the CMS Medicare Coverage Database billing and coding articles.