ICD-10-CM J21 is the diagnosis code for Acute bronchiolitis. This code falls under the section "Other acute lower respiratory infections" within Chapter 10 â Diseases of the respiratory system (J00-J99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions are not included in J21. If the patient has both, code each condition separately:
Understanding where J21 sits in the ICD-10-CM classification helps ensure proper coding:
No, J21 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
J21 is the ICD-10-CM diagnosis code for "Acute bronchiolitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
J21 is located in Section J20-J22 â "Other acute lower respiratory infections" within Chapter 10 of the ICD-10-CM Tabular List.
J21 has 4 sub-code(s) that provide more specific detail: J21.0, J21.1, J21.8, J21.9.
Use J21 when the patients documented diagnosis matches "Acute bronchiolitis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Acute bronchiolitis is J21.
No, J21 is non-billable. Use a more specific sub-code for primary diagnosis billing.
J21 is in Chapter 10 of the ICD-10-CM Tabular List.
Yes, J21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.