ICD-10 Code D75.838 – Other thrombocytosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D75.838 – Other thrombocytosis
What it is
Other thrombocytosis means an abnormally increased platelet count that does not fit a more specific thrombocytosis category. Use this code when the record identifies thrombocytosis but does not document a clearer cause or subtype.
Clinical signs
Clinical features vary; refer to documentation. Thrombocytosis may be found on laboratory testing and may be described as persistent or incidental, with or without symptoms related to the underlying condition.
When to use this code
Use D75.838 when the provider documents thrombocytosis and the chart does not support a more specific diagnosis. It is appropriate for nonspecific or residual documentation such as “other thrombocytosis” or “thrombocytosis, unspecified type.”
If the record identifies a different cause, such as a reactive or secondary process, code that documented condition instead. Check documentation when thrombocytosis is mentioned only as a lab finding without a clear assessment.
Do not use for
Do not use this code when the provider documents a more specific thrombocytosis type or an underlying disorder that explains the platelet elevation. Do not assign it for isolated abnormal labs without clinical interpretation.
Coding tip
Code the documented diagnosis, not the platelet result alone, and query the provider if the thrombocytosis type is unclear.