W55
⚠ Non-billable
Contact with other mammals
ICD-10-CM · FY2026 · External Causes of Morbidity
Code
W55
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
External Causes of Morbidity
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Includes
- contact with saliva, feces or urine of mammal
Excludes1 — never code together
- 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
Frequently asked questions
What is ICD-10 code W55?
ICD-10-CM code W55 represents Contact with other mammals. It is a non-billable header code requiring a more specific subcategory in the External Causes of Morbidity chapter, effective October 1, 2025 – September 30, 2026.
Is W55 billable?
No. W55 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is W55 in?
W55 belongs to the External Causes of Morbidity chapter (V00–Y99) of ICD-10-CM.
Related codes in the W55 category
W55.0
Contact with cat
Non-billable
W55.1
Contact with horse
Non-billable
W55.2
Contact with cow
Non-billable
W55.3
Contact with other hoof stock
Non-billable
W55.01
Bitten by cat
Non-billable
W55.03
Scratched by cat
Non-billable
W55.09
Other contact with cat
Non-billable
W55.11
Bitten by horse
Non-billable
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