B66.0 — Opisthorchiasis
B66.0 is a billable, specific ICD-10-CM code for opisthorchiasis. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Infection due to cat liver fluke
- Infection due to Opisthorchis (felineus)(viverrini)
Risk adjustment
B66.0 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.
Medicare coverage
B66.0 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56421Billing and Coding: CT of the Abdomen and Pelvis
How B66.0 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 B66.0.
- Opisthorchiasis(felineus) (viverrini)
- Infection, infected, infective›cat liver fluke
- Infection, infected, infective›Opisthorchis(felineus) (viverrini)
- Infestation›cat liver fluke
- Infestation›Opisthorchis(felineus) (viverrini)
- Infestation›fluke›cat liver
- Infestation›fluke›liver›cat
Related codes at this level
Codes that share B66. If B66.0 is not quite right, the correct code is usually one of these.
Questions about B66.0
- Is B66.0 a billable ICD-10-CM code?
- Yes. B66.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does B66.0 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Helminthiases (B65-B83).