Is ICD-10-CM code W28 billable?

No, W28 (Contact with powered lawn mower) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code W28 belong to?

W28 belongs to Chapter 20 of the ICD-10-CM tabular list: V00–Y99 (External Causes of Morbidity).

W28Not billable, use a more specific code below

Contact with powered lawn mower

In Exposure to inanimate mechanical forces (W20-W49), chapter 20: External Causes of Morbidity

3 billable codes under W28: none are a CC or MCC; none map to an HCC.

Instructional notes

Includes: conditions that are coded here

Powered lawn mower (commercial) (residential)

Excludes1: not coded here, use a different code

contact with nonpowered lawn mower (W27.1)

Excludes2: not included here, code separately if applicable

exposure to electric current (W86.-)

Also applies, from Exposure to inanimate mechanical forces (W20-W49)

These notes sit on W20-W49 and apply to every code under it, including W28.

Excludes1: not coded here, use a different code

assault (X92-Y09)
contact or collision with animals or persons (W50-W64)
exposure to inanimate mechanical forces involving military or war operations (Y36.-, Y37.-)
intentional self-harm (X71-X83)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.

General External Cause Coding Guidelines (page 88)
Place of Occurrence Guideline (page 89)
Activity Code (page 89)
Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
If the Reporting Format Limits the Number of External Cause Codes (page 90)
Multiple External Cause Coding Guidelines (page 90)
Child and Adult Abuse Guideline (page 90)
Unknown or Undetermined Intent Guideline (page 91)

Read Section I.C.20 (page 87), 3 more topics

All codes under W28

W28 can't be used on a claim. Pick a billable code below; grey headings group them.

W28 MS-DRGs

This code does not group to an MS-DRG as a principal diagnosis.

Other codes that refer to W28

Notes on these codes point to W28.

W00-W19 Excludes1: fall (in) (from) machinery (in operation) (W28-W31)
W20 Excludes1: falling object in machinery accident (W24, W28-W31)
W23 Excludes1: injury caused by machinery (W28-W31)
W29.3 Excludes1: contact with powered lawn mower (W28)
W31.82 Excludes1: contact with powered lawn mower (W28)

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.