Y21
ICD-10Non-billable categoryDrowning and submersion, undetermined intent
Official ICD-10-CM descriptor (FY2026)
Drowning and submersion, undetermined intent
Y21 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.
7th character
- The appropriate 7th character is to be added to each code from category Y21
Permitted 7th characters
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
More specific codes under Y21
- Y21.0Drown while in bathtub, undetermined intentcategory
- Y21.1Drown after fall into bathtub, undetermined intentcategory
- Y21.2Drown while in swimming pool, undetermined intentcategory
- Y21.3Drown after fall into swimming pool, undetermined intentcategory
- Y21.4Drown in natural water, undetermined intentcategory
- Y21.8Other drowning and submersion, undetermined intentcategory
- Y21.9Unspecified drowning and submersion, undetermined intentcategory
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.