Y99
ICD-10Non-billable categoryExternal cause status
Official ICD-10-CM descriptor (FY2026)
External cause status
Y99 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Notes
- A single code from category Y99 should be used in conjunction with the external cause code(s) assigned to a record to indicate the status of the person at the time the event occurred.
More specific codes under Y99
Where this code sits
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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.