Is W35 a billable ICD-10-CM code?

No. W35 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does W35 sit in the tabular list?

External causes of morbidity (V00-Y99), in the block Exposure to inanimate mechanical forces (W20-W49).

What cannot be coded together with W35?

W35 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

W35

W35 — Explosion and rupture of boiler

Non-billable headerICD-10-CM

W35 is a non-billable header ICD-10-CM code for explosion and rupture of boiler. 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 W35

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.

explosion and rupture of boiler on watercraft (V93.4)

Other codes that can never be billed with W35

These codes carry an Excludes1 note pointing at W35. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading W35 alone.

W20Struck by thrown, projected or falling object

Risk adjustment

W35 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 W35 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 W35.

Explosion›boiler, not on transport vehicle(machinery)
Explosion›hot water heater, tank(in machinery)

Code to one of these instead W35

3 child codes. Green means billable.

Questions about W35

Is W35 a billable ICD-10-CM code?: No. W35 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does W35 sit in the tabular list?: External causes of morbidity (V00-Y99), in the block Exposure to inanimate mechanical forces (W20-W49).
What cannot be coded together with W35?: W35 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.