Is W55 a billable ICD-10-CM code?

No. W55 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does W55 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 W55?

W55 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

W55

W55 — Contact with other mammals

Non-billable headerICD-10-CM

W55 is a non-billable header ICD-10-CM code for contact with other mammals. 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 each code from category W55

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.

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

Includes

Conditions this code covers.

contact with saliva, feces or urine of mammal

Risk adjustment

W55 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.

Code to one of these instead W55

7 child codes. Green means billable.

Questions about W55

Is W55 a billable ICD-10-CM code?: No. W55 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does W55 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 W55?: W55 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.