W57
ICD-10Non-billable categoryBit/stung by nonvenom insect and oth nonvenomous arthropods
Official ICD-10-CM descriptor (FY2026)
Bitten or stung by nonvenomous insect and other nonvenomous arthropods
W57 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.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- contact with venomous insects and arthropods (T63.2-, T63.3-, T63.4-)
7th character
- The appropriate 7th character is to be added to code W57
Permitted 7th characters
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
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.