Abnormal plasma viscosity

This code indicates an elevated resistance to flow in the blood plasma, often reflecting an increase in plasma proteins such as immunoglobulins or fibrinogen. It signifies a laboratory finding that can be associated with various underlying systemic conditions affecting blood rheology.

Apply this code when documentation explicitly states "abnormal plasma viscosity," "increased plasma viscosity," or a specific numerical value exceeding the normal reference range for plasma viscosity. This finding is often identified through laboratory testing in patients with conditions like multiple myeloma, Waldenström's macroglobulinemia, or severe inflammatory states.

• Do not code this as a primary diagnosis if the underlying cause of the abnormal plasma viscosity is known and documented.
• Always sequence this code after the definitive diagnosis responsible for the abnormal viscosity, if applicable.
• Ensure the medical record clearly indicates the abnormal finding, typically from laboratory results or physician interpretation.