Other viral diseases (B25-B34)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.

• Human Immunodeficiency Virus (HIV) Infections (page 19)
• Infectious agents as the cause of diseases classified to other chapters (page 22)
• Infections resistant to antibiotics (page 22)
• Sepsis, Severe Sepsis, and Septic Shock (page 23)
• Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
• Zika virus infections (page 28)
• Coronavirus infections (page 28)

Read Section I.C.1 (page 19)

All codes under B25-B34

B25-B34 can't be used on a claim. Pick a billable code below; grey headings group them.

• B25Cytomegaloviral disease
• B25.0Cytomegaloviral pneumonitis
• B25.1Cytomegaloviral hepatitis
• B25.2Cytomegaloviral pancreatitis
• B25.8Other cytomegaloviral diseases
• B25.9Cytomegaloviral disease, unspecified
• B26Mumps
• B26.0Mumps orchitis
• B26.1Mumps meningitis
• B26.2Mumps encephalitis
• B26.3Mumps pancreatitis
• B26.8Mumps with other complications
• B26.81Mumps hepatitis
• B26.82Mumps myocarditis
• B26.83Mumps nephritis
• B26.84Mumps polyneuropathy
• B26.85Mumps arthritis
• B26.89Other mumps complications
• B26.9Mumps without complication
• B27Infectious mononucleosis
• B27.0Gammaherpesviral mononucleosis
• B27.00Gammaherpesviral mononucleosis without complication
• B27.01Gammaherpesviral mononucleosis with polyneuropathy
• B27.02Gammaherpesviral mononucleosis with meningitis
• B27.09Gammaherpesviral mononucleosis with other complications
• B27.1Cytomegaloviral mononucleosis
• B27.10Cytomegaloviral mononucleosis without complications
• B27.11Cytomegaloviral mononucleosis with polyneuropathy
• B27.12Cytomegaloviral mononucleosis with meningitis
• B27.19Cytomegaloviral mononucleosis with other complication
• B27.8Other infectious mononucleosis
• B27.80Other infectious mononucleosis without complication
• B27.81Other infectious mononucleosis with polyneuropathy
• B27.82Other infectious mononucleosis with meningitis
• B27.89Other infectious mononucleosis with other complication
• B27.9Infectious mononucleosis, unspecified
• B27.90Infectious mononucleosis, unspecified without complication
• B27.91Infectious mononucleosis, unspecified with polyneuropathy
• B27.92Infectious mononucleosis, unspecified with meningitis
• B27.99Infectious mononucleosis, unspecified with other complication
• B30Viral conjunctivitis
• B30.0Keratoconjunctivitis due to adenovirus
• B30.1Conjunctivitis due to adenovirus
• B30.2Viral pharyngoconjunctivitis
• B30.3Acute epidemic hemorrhagic conjunctivitis (enteroviral)
• B30.8Other viral conjunctivitis
• B30.9Viral conjunctivitis, unspecified
• B33Other viral diseases, not elsewhere classified
• B33.0Epidemic myalgia
• B33.1Ross River disease
• B33.2Viral carditis
• B33.20Viral carditis, unspecified
• B33.21Viral endocarditis
• B33.22Viral myocarditis
• B33.23Viral pericarditis
• B33.24Viral cardiomyopathy
• B33.3Retrovirus infections, not elsewhere classified
• B33.4Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]
• B33.8Other specified viral diseases
• B34Viral infection of unspecified site
• B34.0Adenovirus infection, unspecified
• B34.1Enterovirus infection, unspecified
• B34.2Coronavirus infection, unspecified
• B34.3Parvovirus infection, unspecified
• B34.4Papovavirus infection, unspecified
• B34.8Other viral infections of unspecified site
• B34.9Viral infection, unspecified

B25-B34 MS-DRGs

This code does not group to an MS-DRG as a principal diagnosis.

Other codes that refer to B25-B34

Notes on these codes point to B25-B34.

• O98.5 Includes: Conditions in A80-B09, B25-B34, R87.81-, R87.82-

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.