External cause status (Y99) ICD-10-CM
The Y99 code range covers external cause status with 6 ICD-10-CM diagnosis codes. 5 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
- A single code from category Y99 should be used in conjunction with the external cause codes assigned to a record to indicate the status of the person at the time the event occurred.
Codes in the Y99 Range 6 codes · 5 billable
About the Y99 Code Range
External cause status adds context about an activity associated with an external cause of illness or death.
The subdivisions distinguish civilian activity done for pay (Y99.0), military activity (Y99.1), and volunteer activity (Y99.2). Other external cause status (Y99.8) and unspecified external cause status (Y99.9) have separate subdivisions.
Questions About This Page
How many billable codes are in the Y99 range?
Of the 6 codes in this range, 5 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 Y99 range classify?
The range classifies external cause status. 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.
