Z20.820 Contact with and (suspected) exposure to varicella

ICD10CM code

#### Name of the Condition
- Contact with and (suspected) exposure to varicella
- Also known as Chickenpox exposure

#### Summary
- This condition involves being exposed to the varicella-zoster virus, which causes chickenpox. It does not mean the person is infected but that there is potential for infection, typically requiring monitoring or preventive action.

#### Causes
- The primary cause of concern is exposure to another person infected with the varicella-zoster virus.

#### Risk Factors
- Close contact with individuals having active chickenpox infection.
- Being unvaccinated or having a weakened immune system enhances risk.

#### Symptoms
- The exposure itself doesn't cause symptoms but can lead to development of chickenpox symptoms if infection occurs. Symptoms include a rash, itching, and flu-like symptoms.

#### Diagnosis
- Exposure history is typically used for diagnosis.
- Blood tests or skin tests could potentially confirm infection status.

#### Treatment Options
- Post-exposure vaccination can prevent the onset of chickenpox in healthy individuals.
- Antiviral medications might be considered for those at high risk of complications.

#### Prognosis and Follow-Up
- If managed early with preventive measures, exposure does not generally result in chickenpox.
- It's critical to monitor for symptoms in the following weeks.

#### Complications
- If exposure leads to infection, complications like bacterial infections of the skin, pneumonia, or encephalitis might occur, especially in high-risk individuals.

#### Lifestyle & Prevention
- Vaccination is the most effective preventive measure. 
- Avoiding close contact with infected individuals during their contagious phase can reduce risk.

#### When to Seek Professional Help
- Seek medical attention if exposed and part of a high-risk group (e.g., pregnant women, immunocompromised individuals).
- Immediate care is recommended for symptoms like high fever, breathing difficulty, or severe skin infections.

#### Additional Resources
- Centers for Disease Control and Prevention (CDC): [Varicella (Chickenpox) Vaccination](https://www.cdc.gov/vaccines/vpd/varicella/index.html)
- American Academy of Pediatrics: [Varicella (Chickenpox)](https://www.healthychildren.org/English/health-issues/vaccine-preventable-diseases/Pages/Chickenpox.aspx)

#### Tips for Medical Coders
- Ensure it's documented whether exposure is suspected or confirmed.
- Note the patient context (such as immunocompromised) as it might affect coding specificity.
- Avoid confusing exposure codes with infection codes.

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