J21 refers to Acute bronchiolitis, a category of acute lower respiratory infections that affect the bronchi, bronchioles, or other unspecified parts of the lower airways. These conditions are common in both adults and children and typically result from viral infections.

Symptoms

Cough with or without sputum – A hallmark of acute bronchitis (J20)
Wheezing and difficulty breathing – Especially seen in bronchiolitis (J21), often in infants
Low-grade fever – Common across all acute lower respiratory infections
Chest discomfort – Associated with inflammation in bronchitis
Rapid breathing – May indicate respiratory distress in young children with J21
Fatigue and malaise – Present in most acute respiratory conditions
Crackles or wheezes on auscultation – Helps localize infection and inflammation

Diagnosis

Diagnosis of Acute bronchiolitis is usually clinical. Physical exam, patient history, and auscultation findings are key. Chest X-rays may be used to rule out pneumonia. Nasopharyngeal swabs can identify viral causes, especially in bronchiolitis outbreaks.

ICD10 Code Usage

ICD10 code J21 is used by pediatricians, family physicians, emergency doctors, and urgent care providers. It guides decisions on symptomatic treatment, need for hospitalization, supportive therapies, and billing documentation for acute lower respiratory care.

Related Codes

FAQs

Q1: What is ICD10 code J21?
A: It refers to Acute bronchiolitis, an acute infection involving the lower airways such as bronchi or bronchioles, leading to cough and breathing difficulty.

Q2: Is this condition viral or bacterial?
A: Most cases are viral and do not require antibiotics. Bacterial causes are less common and diagnosed based on clinical judgment.

Q3: What’s the difference between bronchitis (J20) and bronchiolitis (J21)?
A: Bronchitis affects larger airways and is more common in adults; bronchiolitis affects smaller airways and typically occurs in infants.

Q4: When is hospitalization required?
A: Hospitalization may be needed in severe bronchiolitis or when respiratory distress, hypoxia, or feeding difficulties occur in infants.

Q5: Who manages these conditions?
A: Primary care doctors, pediatricians, urgent care, and emergency providers typically manage these cases unless complications arise.

Conclusion

ICD10 code J21 ensures proper diagnosis and classification of Acute bronchiolitis, helping clinicians manage lower respiratory infections effectively while supporting accurate documentation and healthcare resource planning.