ICD-10-CM Diagnosis Codes
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How is a diagnosis of “secondary thrombocytosis” coded?
Assign code 790.99, Other nonspecific findings on examination of blood, when the condition is clinically significant. Per the Official Guidelines for Coding and Reporting, “Abnormal findings are not coded and reported unless the provider indicates their clinical significance.” However, if the underlying cause of the thrombocytosis is documented, code that condition instead.
Secondary thrombocytosis is strictly reactive and not a platelet disorder. Platelets are acute-phase reactants; therefore, they increase in response to various stimuli, including systemic infections, inflammatory conditions, bleeding, and tumors. It can arise in a wide variety of other circumstances including rebound from myelosuppression, iron deficiency, or as part of an acute phase response.
Ask the Editor: Secondary Thrombocytosis. AHA Coding Clinic for ICD-9-CM. 2012; Volume 29 Issue 3