2026 ICD-10-CM Diagnosis Code W55Contact with other mammals

ICD-10-CM Codes›V01–Y99›W50-W64›W55

ICD-10-CM W55
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

W55 is a non-billable ICD-10-CM category code for contact with other mammals, so it cannot be submitted on claims. Use a more specific code from this category instead, such as W55.01XA, W55.01XD, W55.01XS, and W55.03XA.

Code Identity

ICD-10-CM Code
W55
Billable Status
No — Non-Billable Category
Code Describes
Contact with other mammals
Chapter
W50-W64
Exposure to animate mechanical forces

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionW50-W64Exposure to animate mechanical forces
CategoryW55Contact with other mammals
This CodeW55Contact with other mammals

Specific Coding for Contact with other mammalsOverview

Non-specific codes like W55 require more characters. Use one of these billable codes instead:

  • W55.0 for Contact with cat

  • W55.01 for Bitten by cat

  • W55.03 for Scratched by cat

  • W55.09 for Other contact with cat

  • W55.1 for Contact with horse

  • W55.11 for Bitten by horse

  • W55.12 for Struck by horse

  • W55.19 for Other contact with horse

  • W55.2 for Contact with cow

  • W55.21 for Bitten by cow

  • W55.22 for Struck by cow

  • W55.29 for Other contact with cow

  • W55.3 for Contact with other hoof stock

  • W55.31 for Bitten by other hoof stock

  • W55.32 for Struck by other hoof stock

  • W55.39 for Other contact with other hoof stock

  • W55.4 for Contact with pig

  • W55.41 for Bitten by pig

  • W55.42 for Struck by pig

  • W55.49 for Other contact with pig

  • W55.5 for Contact with raccoon

  • W55.51 for Bitten by raccoon

  • W55.52 for Struck by raccoon

  • W55.59 for Other contact with raccoon

  • W55.8 for Contact with other mammals

  • W55.81 for Bitten by other mammals

  • W55.82 for Struck by other mammals

  • W55.89 for Other contact with other mammals

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • contact with saliva, feces or urine of mammal

Type 1 Excludes

  • 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 Note

  • The appropriate 7th character is to be added to each code from category W55

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About W55Overview

Is W55 (Contact with other mammals) a billable code?

No. This is a category header that groups the codes for contact with other mammals, and headers cannot be submitted on claims. Claims for contact with other mammals need a more specific code from this category, such as W55.01XA, W55.01XD, and W55.01XS.