Y99.8 — Other external cause status
Y99.8 is a billable, specific ICD-10-CM code for other external cause status. It is valid for submission on a claim.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Activity NEC
- Activity of child or other family member assisting in compensated work of other family member
- Hobby not done for income
- Leisure activity
- Off-duty activity of military personnel
- Recreation or sport not for income or while a student
- Student activity
Other codes that can never be billed with Y99.8
These codes carry an Excludes1 note pointing at Y99.8. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Y99.8 alone.
Risk adjustment
Y99.8 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 Y99.8 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 Y99.8.
- External cause status›child assisting in compensated work for family
- External cause status›family member assisting in compensated work for other family member
- External cause status›hobby not done for income
- External cause status›leisure activity
- External cause status›off-duty activity of military personnel
- External cause status›recreation or sport not for income or while a student
- External cause status›specified NEC
- External cause status›student activity
- Status of external cause›child assisting in compensated work for family
- Status of external cause›family member assisting in compensated work for other family member
- Status of external cause›hobby not done for income
- Status of external cause›leisure activity
Related codes at this level
Codes that share Y99. If Y99.8 is not quite right, the correct code is usually one of these.
Questions about Y99.8
- Is Y99.8 a billable ICD-10-CM code?
- Yes. Y99.8 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does Y99.8 sit in the tabular list?
- External causes of morbidity (V00-Y99), in the block Supplementary factors related to causes of morbidity classified elsewhere (Y90-Y99).
- What cannot be coded together with Y99.8?
- Y99.8 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.