Y99.8
ICD-10BillableOther external cause status
Official ICD-10-CM descriptor (FY2026)
Other external cause status
Y99.8 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Activity NEC
- Activity of child or other family member assisting in compensated work of other family member
- Hobby not done for income
- Leisure activity
- Off-duty activity of military personnel
- Recreation or sport not for income or while a student
- Student activity
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- civilian activity done for income or compensation (Y99.0)
- military activity (Y99.1)
Related codes in Y99
Where this code sits
- Parent code
- Y99
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.