Monocytosis (symptomatic)

This code represents an abnormally elevated count of monocytes in the peripheral blood, which is causing symptoms. Monocytosis is a type of leukocytosis and indicates an active immune response, often to chronic inflammation, infection, or certain hematologic disorders. The "symptomatic" designation implies that the monocytosis is not an incidental lab finding but is contributing to the patient's clinical presentation.

Use this code when documentation explicitly states symptomatic monocytosis or when a high monocyte count is directly linked to the patient's reported symptoms (e.g., fever, fatigue, splenomegaly) and no more specific underlying cause is identified or can be coded. This code is appropriate when the monocytosis itself is being treated or investigated as a primary concern.

• Do not use this code if the monocytosis is an expected finding of a more specific underlying condition that is also being coded (e.g., tuberculosis, chronic myelomonocytic leukemia).
• Ensure documentation specifies "symptomatic" monocytosis; otherwise, consider using an unspecified monocytosis code if no symptoms are linked.
• Remember the Excludes1 note: never code this with infectious mononucleosis (B27.-), as monocytosis is an expected finding of that condition.