ICD-10 Code D69.42 – Congenital and hereditary thrombocytopenia purpura (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D69.42 – Congenital and hereditary thrombocytopenia purpura
What it is
This code identifies a congenital or inherited disorder causing low platelet count with purpura. Use it when the record documents a hereditary thrombocytopenic condition rather than an acquired cause.
Clinical signs
Typical findings include easy bruising, petechiae, mucosal bleeding, or other bleeding tendencies linked to thrombocytopenia. Clinical features vary; refer to documentation.
When to use this code
Use D69.42 when the provider clearly documents congenital or hereditary thrombocytopenic purpura, including inherited platelet disorders with purpura. It is appropriate for established diagnoses in inpatient, outpatient, or problem-list documentation. Do not assume heredity from a low platelet count alone; check documentation.
Do not use for
Do not use this code for acquired thrombocytopenia, immune thrombocytopenic purpura, or thrombocytopenia due to drugs, infection, or pregnancy. If the cause is not documented, check documentation.
Coding tip
Verify that the record states congenital, hereditary, or familial disease before assigning D69.42.