ICD-10 Code B77.81 – Ascariasis pneumonia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B77.81 – Ascariasis pneumonia
What it is
B77.81 identifies pneumonia caused by Ascaris infection. Use it when the record links pulmonary inflammation or respiratory involvement to ascariasis.
Clinical signs
Clinical features vary; refer to documentation. Records may note cough, wheeze, dyspnea, fever, or eosinophilic lung findings during larval migration, but you should code only what is documented.
When to use this code
Use B77.81 when the provider documents ascariasis pneumonia, pulmonary ascariasis, or lung involvement due to Ascaris. It may appear with gastrointestinal ascariasis if both are documented and separately relevant. Check documentation if the chart only says parasitic pneumonia.
Do not use for
Do not use this code for unspecified pneumonia without a documented Ascaris cause. Do not apply it to intestinal ascariasis alone or to other helminth infections.
Coding tip
Confirm the organism and site in the assessment, because B77.81 requires both ascariasis and pulmonary involvement to be clearly documented.