ICD-10-CM 2027 diagnosis code

Y33Other specified events, undetermined intent

Not billable — use a more specific code

Y33 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 Y33

Y33 is the ICD-10-CM diagnosis code for other specified events, undetermined intent. It belongs to block Y21-Y33 (event of undetermined intent) and chapter 20 (external causes of morbidity). 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: Y33.XXXA (initial encounter), Y33.XXXD (subsequent encounter) and Y33.XXXS (sequela).

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 Y33

Notes that apply from higher levels

Instructions written at a parent level also apply to Y33.

Broader instructions also apply from Y21-Y33 Event of undetermined intent and Chapter 20: External causes of morbidity.

Alphabetic index entries

5 entries

Terms in the official ICD-10-CM index that lead to Y33.

Code history

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

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about Y33

Is Y33 billable?: No. Y33 is a header code. Report one of its more specific subcodes instead.