ICD-10-CM 2027 diagnosis code

Z29Encounter for other prophylactic measures

Not billable — use a more specific code

Z29 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z29

Z29 is the ICD-10-CM diagnosis code for encounter for other prophylactic measures. It belongs to block Z20-Z29 (persons with potential health hazards related to communicable diseases) 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 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Z29.1 (immunotherapy), Z29.3 (administration), Z29.8 (measures) and Z29.9 (unspecified).

Don't report Z29 together with the conditions in its Excludes1 note: desensitization to allergens (Z51.6) and prophylactic surgery (Z40.-).

It was added in FY2017, effective October 1, 2016.

Specific codes under Z29

Coding notes

Excludes1Not coded here — never report together with this code

desensitization to allergens (Z51.6)
prophylactic surgery (Z40.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to Z29.

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

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2017 (effective 10/1/2016): Added
No changes since FY2017.

Common questions about Z29

Is Z29 billable?: No. Z29 is a header code. Report one of its more specific subcodes instead.