2024 ICD-10-CM Diagnosis Code B34.9

Viral infection, unspecified

ICD-10-CM Code:
ICD-10 Code for:
Viral infection, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Certain infectious and parasitic diseases
    • Other viral diseases
      • Viral infection of unspecified site

B34.9 is a billable diagnosis code used to specify a medical diagnosis of viral infection, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like B34.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Acute infectious tubulointerstitial nephritis
  • Acute infective otitis externa
  • Acute pyelonephritis
  • Acute tubulointerstitial nephritis
  • Acute viral disease
  • Acute viral otitis externa
  • Acute viral tubulointerstitial nephritis
  • Alanine aminotransferase level within reference range
  • Alanine aminotransferase within reference range with persistent viremia by polymerase chain reaction
  • Amantadine resistant virus present
  • Arthritis of hand due to viral infection
  • Arthritis of knee due to viral infection
  • Arthritis of knee due to viral infection
  • Arthritis of knee due to viral infection
  • Arthritis of knee due to viral infection
  • Arthritis of left ankle caused by viral infection
  • Arthritis of left ankle caused by viral infection
  • Arthritis of left knee caused by viral infection
  • Arthritis of left knee caused by viral infection
  • Arthritis of right ankle caused by viral infection
  • Arthritis of right ankle caused by viral infection
  • Arthritis of right knee caused by viral infection
  • Arthritis of right knee caused by viral infection
  • Arthropathy associated with viral disease
  • Arthropathy of bilateral wrist joints
  • Asymptomatic viremia
  • Autoimmune lymphoproliferative syndrome with recurrent viral infection
  • Bilateral arthritis of ankle
  • Bilateral arthritis of ankles caused by viral infection
  • Bilateral arthritis of knees caused by viral infection
  • Bilateral arthritis of shoulders
  • Bilateral arthritis of shoulders caused by viral infection
  • Bilateral arthritis of wrist
  • Bilateral arthritis of wrists caused by viral infection
  • Bilateral infective arthritis of knees
  • Bilateral inflammation of shoulder regions
  • Chronic viral otitis externa
  • Gingival disease due to virus
  • Illness
  • Illness
  • Inconclusive evaluation finding
  • Infection due to resistant virus
  • Infection involving inner ear
  • Infectious panuveitis
  • Infective arthritis of joint of hand
  • Infective arthritis of left ankle
  • Infective arthritis of left ankle
  • Infective arthritis of left wrist
  • Infective arthritis of right ankle
  • Infective arthritis of right ankle
  • Infective arthritis of right wrist
  • Infective arthritis of wrist
  • Influenza-like illness
  • Labyrinthitis of bilateral inner ears
  • Labyrinthitis of left inner ear
  • Labyrinthitis of right inner ear
  • Liver enzymes within reference range
  • Neonatal dacryocystitis or conjunctivitis due to virus
  • Neonatal hyperbilirubinemia due to viral infection
  • Neonatal viral infection of skin
  • Oseltamivir resistant virus present
  • Panuveitis caused by virus
  • Polyarticular viral arthritis
  • Recurrent viral infection
  • Sepsis caused by virus
  • Sustained viral response
  • Viral arthritis co-occurrent with hepatitis
  • Viral cardiovascular infection
  • Viral corneal ulcer
  • Viral disease
  • Viral disease in mother complicating childbirth
  • Viral disease in mother complicating pregnancy, childbirth AND/OR puerperium
  • Viral ear infection
  • Viral esophagitis
  • Viral eye infection
  • Viral fever
  • Viral gastritis
  • Viral headache
  • Viral infection of peripheral nerve
  • Viral labyrinthitis
  • Viral labyrinthitis of bilateral inner ears
  • Viral labyrinthitis of left inner ear
  • Viral labyrinthitis of right inner ear
  • Viral lower respiratory infection
  • Viral musculoskeletal infection
  • Viral myalgia
  • Viral myositis
  • Viral pharyngitis
  • Viral pleurisy
  • Viral posterior uveitis
  • Viral posterior uveitis
  • Viral sinusitis
  • Viral syndrome
  • Viremia
  • Virus inconclusive
  • Virus present
  • Virus-associated atypical lymphoproliferative disorder
  • Zanamivir resistant virus present

Clinical Classification

Clinical Information

  • Viremia

    the presence of viruses in the blood.
  • Viral Esophagitis

    viral infection of the esophagus. it often occurs in immunocompromised patients and it is caused by cytomegalovirus or herpes simplex virus. symptoms include pain on swallowing, fever, and retrosternal burning.
  • Adenovirus DNA Viremia|AdV DNA Viremia

    a laboratory test result indicating the presence of adenovirus dna in the blood.
  • Grade 2 Viremia, CTCAE|Grade 2 Viremia

    moderate symptoms; medical intervention indicated
  • Grade 3 Viremia, CTCAE|Grade 3 Viremia

    severe or medically significant but not immediately life-threatening; hospitalization or prolongation of existing hospitalization indicated
  • Viremia

    a laboratory test result indicating the presence of a virus in the blood.
  • Viremia, CTCAE|Viremia

    a disorder characterized by the presence of a virus in the blood stream.
  • Cytomegaloviral Gastritis|CMV Gastritis|CMV-Related Gastritis|Cytomegalovirus Gastritis|Cytomegalovirus-Related Gastritis

    inflammation of stomach that is associated with cytomegalovirus.
  • Viral Gastritis

    inflammation of the stomach resulting from viral infection.
  • Acute Pyelonephritis

    sudden onset pyelonephritis.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Viremia NOS

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert B34.9 to ICD-9-CM

  • ICD-9-CM Code: 790.8 - Viremia NOS
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education

Viral Infections

What are viruses?

Viruses are very tiny germs. They are made of genetic material (either DNA or RNA) inside of a protein coating. There are a huge number of viruses on earth. Only a small number of them can infect humans. Those viruses can infect our cells, which may cause disease. Some of the diseases that viruses can cause include the common cold, the flu, COVID-19, and HIV.

How are viruses spread?

Viruses can be spread in different ways:

  • Through droplets and particles that are breathed out by someone who has the infection. You might breathe in the droplets or particles, or they could land on your mouth, nose, or eyes.
  • By touching surfaces or objects that have the virus on them and then touching your mouth, nose, or eyes.
  • From the pregnant parent to the baby during pregnancy.
  • Through contaminated food or water.
  • By being bitten by an infected insect or animal.
  • Through sexual contact (usually vaginal, anal and oral sex) with someone who has the infection.

How do viruses cause disease?

Viruses are like hijackers. They invade living, normal cells. They then use those cells to multiply (make copies of themselves). This process is also called replication. The process can kill, damage, or change the infected cells. Sometimes this can make you sick. The symptoms can range from mild to very severe. Other times, your immune system may be able to fight it off and you may not have any symptoms.

Each different virus usually only infects one type of cell in your body. For example, hepatitis viruses affect the cells in the liver. HIV infects a certain type of immune system cell.

What are the treatments for viral infections?

For most viral infections, treatments can only help with symptoms while you wait for your immune system to fight off the virus. There are antiviral medicines to treat some viral infections. Antibiotics do not work for viral infections.

Can viral infections be prevented?

Vaccines can help prevent you from getting many viral diseases. You may be able to prevent some viral infections by:

  • Proper hand washing.
  • Paying attention to food safety.
  • Cleaning surfaces that may be infected with germs.
  • Avoiding contact with wild animals.
  • Preventing insect bites by using insect repellent when you go outdoors. If you travel to an area that has a high risk of diseases from insect bites, also wear long pants, shirts, and socks.
  • Practicing safe sex (using a condom every time you have anal, vaginal, or oral sex).
  • Avoiding close contact with people who are sick.

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.


[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.