Is W57 a billable ICD-10-CM code?

No. W57 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does W57 sit in the tabular list?

External causes of morbidity (V00-Y99), in the block Exposure to animate mechanical forces (W50-W64).

What cannot be coded together with W57?

W57 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

W57

W57 — Bitten or stung by nonvenomous insect and other nonvenomous arthropods

Non-billable headerICD-10-CM

W57 is a non-billable header ICD-10-CM code for bitten or stung by nonvenomous insect and other nonvenomous arthropods. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

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

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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

Risk adjustment

W57 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

How W57 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to W57.

Bite, bitten by›arthropod NEC(nonvenomous)
Bite, bitten by›insect(nonvenomous)
Bite, bitten by›millipede
Bite, bitten by›spider(nonvenomous)
Sting›arthropod, nonvenomous
Sting›insect, nonvenomous
Contact›with›arthropods(nonvenomous)
Contact›with›insect NEC(nonvenomous)
Contact›with›millipede

Code to one of these instead W57

3 child codes. Green means billable.

Questions about W57

Is W57 a billable ICD-10-CM code?: No. W57 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does W57 sit in the tabular list?: External causes of morbidity (V00-Y99), in the block Exposure to animate mechanical forces (W50-W64).
What cannot be coded together with W57?: W57 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.