Is W20.1 a billable ICD-10-CM code?

No. W20.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does W20.1 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 W20.1?

W20.1 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

W20.1

W20.1 — Struck by object due to collapse of building

Non-billable headerICD-10-CM

W20.1 is a non-billable header ICD-10-CM code for struck by object due to collapse of building. 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 W20

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.

struck by object due to collapse of burning building (X00.2, X02.2)

Other codes that can never be billed with W20.1

These codes carry an Excludes1 note pointing at W20.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading W20.1 alone.

X00.2Injury due to collapse of burning building or structure in uncontrolled fire
X00.2XXAInjury due to collapse of burning building or structure in uncontrolled fire, initial encounter
X00.2XXDInjury due to collapse of burning building or structure in uncontrolled fire, subsequent encounter
X00.2XXSInjury due to collapse of burning building or structure in uncontrolled fire, sequela
X02.2Injury due to collapse of burning building or structure in controlled fire
X02.2XXAInjury due to collapse of burning building or structure in controlled fire, initial encounter
X02.2XXDInjury due to collapse of burning building or structure in controlled fire, subsequent encounter
X02.2XXSInjury due to collapse of burning building or structure in controlled fire, sequela

Risk adjustment

W20.1 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 W20.1 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 W20.1.

Collapse›building
Collapse›structure
Fall, falling›building
Fall, falling›structure
Struck by›object›falling›from, in, on›building
Struck by›object›falling›from, in, on›structure

Code to one of these instead W20.1

3 child codes. Green means billable.

Related codes at this level

Codes that share W20. If W20.1 is not quite right, the correct code is usually one of these.

Questions about W20.1

Is W20.1 a billable ICD-10-CM code?: No. W20.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does W20.1 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 W20.1?: W20.1 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.