Other specified events, undetermined intent (Y33) ICD-10-CM
The Y33 code range covers other specified events, undetermined intent with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to code Y33
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the Y33 Range 4 codes · 3 billable
About the Y33 Code Range
These events are specified, but their intent is undetermined. Y33 groups them among external causes.
The subdivisions differ by encounter type. Y33.XXXA identifies an initial encounter, Y33.XXXD a subsequent encounter, and Y33.XXXS a sequela, or later effect.
Questions About This Page
How many billable codes are in the Y33 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the Y33 range classify?
The range classifies other specified events, undetermined intent. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
