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ICD-10-CM 2027 diagnosis code

Z40Encounter for prophylactic surgery

Not billable — use a more specific code

Z40 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z40

Z40 is the ICD-10-CM diagnosis code for encounter for prophylactic surgery. It belongs to block Z40-Z53 (Encounters for other specific health care) 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 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Z40.0 (for risk factors related to malignant neoplasms), Z40.8 (surgery) and Z40.9 (unspecified).

Don't report Z40 together with the conditions in its Excludes1 note: organ donations (Z52.-) and therapeutic organ removal-code to condition.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under Z40

Coding notes

Excludes1Not coded here — never report together with this code
  • organ donations (Z52.-)
  • therapeutic organ removal-code to condition

Notes that apply from higher levels

Instructions written at a parent level also apply to Z40.

Broader instructions also apply from Z40-Z53 Encounters for other specific health care and Chapter 21: Factors influencing health status and contact with health services.

Codes whose notes reference Z40

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)
  • No changes since FY2016.

Common questions about Z40

Is Z40 billable?

No. Z40 is a header code. Report one of its more specific subcodes instead.