Unspecified viral hepatitis is the ICD-10 classification entry B19 used to denote viral hepatitis of undefined cause [1]. It serves as a taxonomic category rather than a clinically characterized disease entity [1][2].
Disease overview
Evidence-backed information EN 1/5 applicable sections · ZH 1/5 applicable sections Updated Oct 23, 2026
Unspecified viral hepatitis is a classification entity defined under ICD-10 code B19 for cases where the viral etiology is not specified [1]. In Brazilian public hospitals from 2019 to 2022, unspecified viral hepatitis without hepatic coma was the most frequent code among hospitalizations for hepatitis of unknown etiology in children and adolescents [2]. A Japanese claims-based study listed unspecified viral hepatitis among chronic liver disease categories but reported no specific platelet or thrombocytopenia findings for this group [3].
Read the full clinical and epidemiological profile 2
- 1 WHO ICD-10. ICD-10 B19: Unspecified viral hepatitis [Internet]. cited 23 Oct 2026. Available from: https://icd.who.int/browse10/2019/en#/B19
- 2 Castro R et al. Hepatitis of unknown etiology in children in Brazil: A new challenge or the usual scenario ? Braz J Infect Dis. 2022 Nov-Dec. PMID: 36356642. doi: 10.1016/j.bjid.2022.102715. PubMed: https://pubmed.ncbi.nlm.nih.gov/36356642/
- 3 Yoshida M et al. Changes in Platelet Counts and Thrombocytopenia Risk in Patients with Chronic Liver Disease with Different Etiologies Using Real-World Japanese Data. Adv Ther. 2022 Feb. PMID: 34928469. doi: 10.1007/s12325-021-02008-x. PubMed: https://pubmed.ncbi.nlm.nih.gov/34928469/
- B19
- 1E50.Y
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