B33.1 — Ross River disease
B33.1 is a billable, specific ICD-10-CM code for ross river disease. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Epidemic polyarthritis and exanthema
- Ross River fever
Other codes that can never be billed with B33.1
These codes carry an Excludes1 note pointing at B33.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading B33.1 alone.
- A92Other mosquito-borne viral fevers
Risk adjustment
B33.1 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 B33.1 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 B33.1.
- Ross River disease or fever
- Disease, diseased›Ross River
- Fever›Ross River
- Polyarthritis, polyarthropathy›epidemic(Australian) (with exanthema)
Related codes at this level
Codes that share B33. If B33.1 is not quite right, the correct code is usually one of these.
Questions about B33.1
- Is B33.1 a billable ICD-10-CM code?
- Yes. B33.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does B33.1 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Other viral diseases (B25-B34).