Lymphocytosis (symptomatic)

This code identifies an elevated lymphocyte count in the peripheral blood that is causing noticeable signs or symptoms in the patient. Lymphocytosis indicates an increase in a specific type of white blood cell, often associated with infections, inflammatory conditions, or certain hematologic disorders. The "symptomatic" designation implies that the patient is experiencing clinical manifestations directly attributable to this elevated count.

Assign this code when documentation clearly indicates an abnormally high lymphocyte count accompanied by patient-reported symptoms or physician-observed signs. This typically applies to acute or chronic conditions where the lymphocytosis is not merely an incidental lab finding but is clinically significant. Supporting documentation includes laboratory results showing elevated lymphocyte percentages or absolute counts, and physician notes detailing associated symptoms.

• Distinguish from asymptomatic lymphocytosis (D72.829), which should be used when no symptoms are present.
• Always code the underlying cause of the lymphocytosis first, if known and documented (e.g., infectious mononucleosis, chronic lymphocytic leukemia).
• Ensure the medical record explicitly links the patient's symptoms to the elevated lymphocyte count to justify the "symptomatic" designation.