D75.83Thrombocytosis

D75.83 is the ICD-10-CM diagnosis code for thrombocytosis. It belongs to category D75 (other and unspecified diseases of blood and blood-forming organs), block D70-D77 (other disorders of blood and blood-forming organs) and chapter 3 (diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within D75.8 (other specified diseases of blood and blood-forming organs), D75.83 is specifically for thrombocytosis. Related codes cover myelofibrosis (D75.81), Heparin induced thrombocytopenia (HIT) (D75.82), other platelet-activating anti-PF4 disorders (D75.84) and other specified diseases of blood and blood-forming organs (D75.89).

To report this condition, pick the subcode that matches the documentation: D75.838 (thrombocytosis) and D75.839 (unspecified).

The conditions in its Excludes2 note aren't part of D75.83, but may be coded alongside it if the patient has both: essential thrombocythemia (D47.3).

It was added in FY2022, effective October 1, 2021.