B66.1 Clonorchiasis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Chinese liver fluke disease
• Infection due to Clonorchis sinensis
• Oriental liver fluke disease

MS-DRG index

Defines the logic of DRG(s) 441-443 in MDC 07.

Approximate ICD-9-CM (GEMs)

• 121.1 Clonorchiasis

Code annotations containing back-references to B66.1

Back-references to B66

• Code First: H94.0 Acoustic neuritis in infectious and parasitic diseases classified elsewhere ("parasitic disease (B65-B89)")
• Type 2 Excludes: J82 Pulmonary eosinophilia, not elsewhere classified ("pulmonary eosinophilia due to specified parasitic infection (B50-B83)")

Diagnosis Index entries for B66.1

• Cholangiohepatitis › due to fluke infestation
• Cirrhosis, cirrhotic (hepatic) (liver) › biliary (cholangiolitic) (cholangitic) (hypertrophic) (obstructive) (pericholangiolitic) › due to › Clonorchiasis
• Clonorchiasis, clonorchis infection (liver)
• Disease, diseased › Chinese liver fluke
• Disease, diseased › liver (chronic) (organic) › fluke › Chinese
• Disease, diseased › liver (chronic) (organic) › fluke › oriental
• Disease, diseased › Oriental liver fluke
• Distomiasis › hepatic › due to Clonorchis sinensis
• Distomiasis › liver › due to Clonorchis sinensis
• Infection, infected, infective (opportunistic) › Clonorchis (sinensis) (liver)
• Infestation › Clonorchis (sinensis) (liver)
• Infestation › fluke › liver (sheep) › Chinese
• Infestation › fluke › liver (sheep) › due to clonorchiasis
• Infestation › fluke › liver (sheep) › oriental

Nearby codes

• B66 Other fluke infections
• B66.0 Opisthorchiasis
• B66.1 Clonorchiasis (this code)
• B66.2 Dicroceliasis
• B66.3 Fascioliasis
• B66.4 Paragonimiasis
• B66.5 Fasciolopsiasis
• B66.8 Other specified fluke infections