W55
ICD-10Non-billable categoryContact with other mammals
Official ICD-10-CM descriptor (FY2026)
Contact with other mammals
W55 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.
Includes
- contact with saliva, feces or urine of mammal
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- animal being ridden- see transport accidents
- bitten or struck by dog (W54)
- bitten or struck by rodent (W53.-)
- contact with marine mammals (W56.-)
7th character
- The appropriate 7th character is to be added to each code from category W55
Permitted 7th characters
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
More specific codes under W55
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.