AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2021 Issue 4; ICD-10-CM New/Revised Codes

Thrombocytosis and Essential Thrombocythemia

New subcategory D75.83, Thrombocytosis, has been created to separately identify other thrombocytosis, including secondary thrombocytosis and reactive thrombocytosis (D75.838) and unspecified thrombocytosis (D75.839). The change will allow for differentiation in coding neoplastic cases of essential thrombocythemia and cases of secondary or reactive thrombocytosis, which are not neoplastic in nature. Thrombocythemia and thrombocytosis are characterized by an abnormally high platelet count in the blood. Thrombocytosis (or thrombocythemia) is often described as secondary or reactive, in which another disease, condition, or outside factor causes the high platelet count. Treatment and outlook for secondary thrombocytosis depend on the...

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