DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

W57 Bitten or stung by nonvenomous insect and other nonvenomous arthropods

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

W57 is not billable. The category heads 3 billable codes in FY2027. 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. W57 Bitten or stung by nonvenomous insect and other nonvenomous arthropods
Billable codes
3
Subdivisions
0
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
0

Codes in W57

  1. W57.XXXA
    Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter
    Billable
  2. W57.XXXD
    Bitten or stung by nonvenomous insect and other nonvenomous arthropods, subsequent encounter
    BillableExempt
  3. W57.XXXS
    Bitten or stung by nonvenomous insect and other nonvenomous arthropods, sequela
    BillableExempt

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 W57

Excludes1

  • contact with venomous insects and arthropods (T63.2-, T63.3-, T63.4-) T63.2 T63.3 T63.4

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 W57 defined here

The appropriate 7th character is to be added to code W57

7th characters for W57
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