Skip to content
Dx

ICD-10-CM 2027 diagnosis code

Z68.4Body mass index [BMI] 40 or greater, adult

Not billable — use a more specific code

Z68.4 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it.

Code last changed in FY2021 (effective October 1, 2020). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z68.4

Z68.4 is the ICD-10-CM diagnosis code for body mass index [BMI] 40 or greater, adult. It belongs to category Z68 (body mass index [BMI]), block Z68 (body mass index [BMI]) and chapter 21 (factors influencing health status and contact with health services). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

Within Z68 (body mass index [BMI]), Z68.4 is specifically for body mass index [BMI] 40 or greater, adult. Related codes cover 19.9 or less, adult (Z68.1), 20-29, adult (Z68.2), 30-39, adult (Z68.3) and pediatric (Z68.5).

To report this condition, pick the subcode that matches the documentation: Z68.41 (adult), Z68.42 (adult), Z68.43 (adult), Z68.44 (adult) and Z68.45 (adult).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2021 (title revised).

Specific codes under Z68.4

Notes that apply from higher levels

Instructions written at a parent level also apply to Z68.4.

› From Z68 Body mass index [BMI]
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)

Broader instructions also apply from Chapter 21: Factors influencing health status and contact with health services.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • FY2021 (effective 10/1/2020): Title revised — was “Body mass index (BMI) 40 or greater, adult”

Common questions about Z68.4

Is Z68.4 billable?

No. Z68.4 is a header code. Report one of its more specific subcodes instead.