| B25 | Cytomegaloviral disease |
| B25.0 | Cytomegaloviral pneumonitis |
| B25.1 | Cytomegaloviral hepatitis |
| B25.2 | Cytomegaloviral pancreatitis |
| B25.8 | Other cytomegaloviral diseases |
| B25.9 | Cytomegaloviral disease, unspecified |
| B26 | Mumps |
| B26.0 | Mumps orchitis |
| B26.1 | Mumps meningitis |
| B26.2 | Mumps encephalitis |
| B26.3 | Mumps pancreatitis |
| B26.8 | Mumps with other complications |
| B26.81 | Mumps hepatitis |
| B26.82 | Mumps myocarditis |
| B26.83 | Mumps nephritis |
| B26.84 | Mumps polyneuropathy |
| B26.85 | Mumps arthritis |
| B26.89 | Other mumps complications |
| B26.9 | Mumps without complication |
| B27 | Infectious mononucleosis |
| B27.0 | Gammaherpesviral mononucleosis |
| B27.00 | Gammaherpesviral mononucleosis without complication |
| B27.01 | Gammaherpesviral mononucleosis with polyneuropathy |
| B27.02 | Gammaherpesviral mononucleosis with meningitis |
| B27.09 | Gammaherpesviral mononucleosis with other complications |
| B27.1 | Cytomegaloviral mononucleosis |
| B27.10 | Cytomegaloviral mononucleosis without complications |
| B27.11 | Cytomegaloviral mononucleosis with polyneuropathy |
| B27.12 | Cytomegaloviral mononucleosis with meningitis |
| B27.19 | Cytomegaloviral mononucleosis with other complication |
| B27.8 | Other infectious mononucleosis |
| B27.80 | Other infectious mononucleosis without complication |
| B27.81 | Other infectious mononucleosis with polyneuropathy |
| B27.82 | Other infectious mononucleosis with meningitis |
| B27.89 | Other infectious mononucleosis with other complication |
| B27.9 | Infectious mononucleosis, unspecified |
| B27.90 | Infectious mononucleosis, unspecified without complication |
| B27.91 | Infectious mononucleosis, unspecified with polyneuropathy |
| B27.92 | Infectious mononucleosis, unspecified with meningitis |
| B27.99 | Infectious mononucleosis, unspecified with other complication |
| B30 | Viral conjunctivitis |
| B30.0 | Keratoconjunctivitis due to adenovirus |
| B30.1 | Conjunctivitis due to adenovirus |
| B30.2 | Viral pharyngoconjunctivitis |
| B30.3 | Acute epidemic hemorrhagic conjunctivitis (enteroviral) |
| B30.8 | Other viral conjunctivitis |
| B30.9 | Viral conjunctivitis, unspecified |
| B33 | Other viral diseases, not elsewhere classified |
| B33.0 | Epidemic myalgia |
| B33.1 | Ross River disease |
| B33.2 | Viral carditis |
| B33.20 | Viral carditis, unspecified |
| B33.21 | Viral endocarditis |
| B33.22 | Viral myocarditis |
| B33.23 | Viral pericarditis |
| B33.24 | Viral cardiomyopathy |
| B33.3 | Retrovirus infections, not elsewhere classified |
| B33.4 | Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS] |
| B33.8 | Other specified viral diseases |
| B34 | Viral infection of unspecified site |
| B34.0 | Adenovirus infection, unspecified |
| B34.1 | Enterovirus infection, unspecified |
| B34.2 | Coronavirus infection, unspecified |
| B34.3 | Parvovirus infection, unspecified |
| B34.4 | Papovavirus infection, unspecified |
| B34.8 | Other viral infections of unspecified site |
| B34.9 | Viral infection, unspecified |