Is W28 a billable ICD-10-CM code?

No. W28 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does W28 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 W28?

W28 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

W28

W28 — Contact with powered lawn mower

Non-billable headerICD-10-CM

W28 is a non-billable header ICD-10-CM code for contact with powered lawn mower. 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 W28

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.

contact with nonpowered lawn mower (W27.1)

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

exposure to electric current (W86.-)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Powered lawn mower (commercial) (residential)

Other codes that can never be billed with W28

These codes carry an Excludes1 note pointing at W28. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading W28 alone.

W20Struck by thrown, projected or falling object
W23Caught, crushed, jammed or pinched in or between objects
W29.3Contact with powered garden and outdoor hand tools and machinery
W29.3XXAContact with powered garden and outdoor hand tools and machinery, initial encounter
W29.3XXDContact with powered garden and outdoor hand tools and machinery, subsequent encounter
W29.3XXSContact with powered garden and outdoor hand tools and machinery, sequela
W31.82Contact with other commercial machinery
W31.82XAContact with other commercial machinery, initial encounter

Risk adjustment

W28 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 W28 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 W28.

Contact›with›lawnmower(powered) (ridden)
Contact›with›tool›powered›lawn mower

Code to one of these instead W28

3 child codes. Green means billable.

Questions about W28

Is W28 a billable ICD-10-CM code?: No. W28 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does W28 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 W28?: W28 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.