Y00 — Assault by blunt object
Y00 is a non-billable header ICD-10-CM code for assault by blunt object. 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 Y00
- 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.
- assault by strike by sports equipment (Y08.0-)
Other codes that can never be billed with Y00
These codes carry an Excludes1 note pointing at Y00. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Y00 alone.
- Y04Assault by bodily force
Risk adjustment
Y00 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 Y00 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 Y00.
- Assault›weapon›blunt
- Struck by›object›blunt›assault
- Struck by›object›projected›assault
- Struck by›object›thrown›assault
- Struck by›other person›with›blunt object›intentional, homicide(attempt)
Code to one of these instead Y00
3 child codes. Green means billable.
Questions about Y00
- Is Y00 a billable ICD-10-CM code?
- No. Y00 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does Y00 sit in the tabular list?
- External causes of morbidity (V00-Y99), in the block Assault (X92-Y09).
- What cannot be coded together with Y00?
- Y00 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.