DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

W55 Contact with other mammals

  • Header · not billable
  • Codes take a 7th character

W55 is not billable. The category heads 63 billable codes in FY2027, grouped under 7 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Where it sits

  1. Chapter 20 External causes of morbidity (V00-Y99)
  2. W50-W64 Exposure to animate mechanical forces (W50-W64)
  3. W55 Contact with other mammals
Billable codes
63
Subdivisions
7
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
0

Codes in W55

  1. W55.0
    Contact with cat
    Header
  2. W55.01
    Bitten by cat +7th: A D S
    Needs 7th characterExempt
  3. W55.03
    Scratched by cat +7th: A D S
    Needs 7th characterExempt
  4. W55.09
    Other contact with cat +7th: A D S
    Needs 7th characterExempt
  5. W55.1
    Contact with horse
    Header
  6. W55.11
    Bitten by horse +7th: A D S
    Needs 7th characterExempt
  7. W55.12
    Struck by horse +7th: A D S
    Needs 7th characterExempt
  8. W55.19
    Other contact with horse +7th: A D S
    Needs 7th characterExempt
  9. W55.2
    Contact with cow
    Header
    Inclusion terms 1

    Inclusion terms

    • Contact with bull
  10. W55.21
    Bitten by cow +7th: A D S
    Needs 7th characterExempt
  11. W55.22
    Struck by cow +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Gored by bull
  12. W55.29
    Other contact with cow +7th: A D S
    Needs 7th characterExempt
  13. W55.3
    Contact with other hoof stock
    Header
    Inclusion terms 2

    Inclusion terms

    • Contact with goats
    • Contact with sheep
  14. W55.31
    Bitten by other hoof stock +7th: A D S
    Needs 7th characterExempt
  15. W55.32
    Struck by other hoof stock +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 2

    Inclusion terms

    • Gored by goat
    • Gored by ram
  16. W55.39
    Other contact with other hoof stock +7th: A D S
    Needs 7th characterExempt
  17. W55.4
    Contact with pig
    Header
  18. W55.41
    Bitten by pig +7th: A D S
    Needs 7th characterExempt
  19. W55.42
    Struck by pig +7th: A D S
    Needs 7th characterExempt
  20. W55.49
    Other contact with pig +7th: A D S
    Needs 7th characterExempt
  21. W55.5
    Contact with raccoon
    Header
  22. W55.51
    Bitten by raccoon +7th: A D S
    Needs 7th characterExempt
  23. W55.52
    Struck by raccoon +7th: A D S
    Needs 7th characterExempt
  24. W55.59
    Other contact with raccoon +7th: A D S
    Needs 7th characterExempt
  25. W55.8
    Contact with other mammals
    Header
  26. W55.81
    Bitten by other mammals +7th: A D S
    Needs 7th characterExempt
  27. W55.82
    Struck by other mammals +7th: A D S
    Needs 7th characterExempt
  28. W55.89
    Other contact with other mammals +7th: A D S
    Needs 7th characterExempt

Sources of each column. Rows marked +7th need a 7th character: pick one to build the full code; its code card has its own flags.

Instructions

At W55

Includes

  • contact with saliva, feces or urine of mammal

Excludes1

  • animal being ridden- see transport accidents
  • bitten or struck by dog (W54) W54
  • bitten or struck by rodent (W53.-) W53
  • contact with marine mammals (W56.-) W56

Notes that also apply

Block W50-W64 instructions (Excludes1 1): printed on the block page.

Chapter 20 instructions (Notes 1): printed on the chapter 20 page.

7th characters

7th characters for W55 defined here

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

7th characters for W55
7thMeaning (NCHS)
Ainitial encounter
Dsubsequent encounter
Ssequela

A code that takes a 7th character is invalid without it; the placeholder X fills a code shorter than 6 characters (Official Guidelines I.A.5). How 7th characters work.

Hierarchy