Y99.8Other external cause status

Y99.8 is the ICD-10-CM diagnosis code for other external cause status. It belongs to category Y99 (external cause status), block Y90-Y99 (Supplementary factors related to causes of morbidity classified elsewhere) and chapter 20 (external causes of morbidity). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Y99, choose Y99.8 (Other external cause status) only when documentation doesn't support a more specific option: civilian activity done for income or pay (Y99.0), military activity (Y99.1), Volunteer activity (Y99.2) and unspecified external cause status (Y99.9).

Don't report Y99.8 together with the conditions in its Excludes1 note: civilian activity done for income or compensation (Y99.0) and military activity (Y99.1).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

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

Before ICD-10, this condition was coded in ICD-9-CM as E000.8 (other external cause status).