ICD-10 Code J84.03 – Idiopathic pulmonary hemosiderosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J84.03 – Idiopathic pulmonary hemosiderosis
What it is
J84.03 identifies idiopathic pulmonary hemosiderosis, a rare lung disorder marked by repeated bleeding into the air spaces of the lungs. The cause is not known, so you code it only when the diagnosis is documented.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include recurrent hemoptysis, iron-deficiency anemia, and diffuse lung infiltrates, but the chart should support the diagnosis rather than symptoms alone.
When to use this code
Use J84.03 when the provider documents idiopathic pulmonary hemosiderosis as the confirmed diagnosis, including follow-up visits, admissions, or specialist evaluations. It may also apply when the condition is listed as the reason for ongoing monitoring or past history in active care. If the record only mentions pulmonary hemorrhage or anemia without this diagnosis, check documentation.
Do not use for
Do not use J84.03 for pulmonary bleeding with an identified cause, such as trauma, infection, or vasculitis. Do not assign it for suspected disease or isolated hemoptysis without a documented diagnosis.
Coding tip
Verify that “idiopathic” is explicitly stated; if the cause is known, this code is not appropriate.