MCMedicalCodingSoftware
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)

Excludes1 inherited from the categories above W20.1

A category’s note binds every code beneath it.

Written on W20: Struck by thrown, projected or falling object

  • falling object in machinery accident (W24, W28-W31)
  • falling object in transport accident (V01-V99)
  • object set in motion by explosion (W35-W40)
  • object set in motion by firearm (W32-W34)
  • struck by thrown sports equipment (W21.-)

Other codes that can never be billed with W20.1

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • W13.9Fall from, out of or through building, not otherwise specified
  • W13.9XXAFall from, out of or through building, not otherwise specified, initial encounter
  • W13.9XXDFall from, out of or through building, not otherwise specified, subsequent encounter
  • W13.9XXSFall from, out of or through building, not otherwise specified, sequela
  • W22.8Striking against or struck by other objects
  • W22.8XXAStriking against or struck by other objects, initial encounter
  • W22.8XXDStriking against or struck by other objects, subsequent encounter
  • W22.8XXSStriking against or struck by other objects, sequela

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

  • 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 history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead W20.1

3 child codes. Green means billable.

Other codes under W20

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.