Prsnl history of dis of the bld/bld-form org/immun mechnsm

This code indicates a patient's past medical history of conditions affecting the blood, bone marrow, spleen, or lymphatic system, as well as prior immune system disorders. It signifies that the patient no longer has the active disease but has a documented history of such a condition.

Apply this code when a patient presents for care and has a documented history of a resolved hematologic or immunologic disorder. This includes conditions like a past diagnosis of anemia, thrombocytopenia, or an immune deficiency that is no longer active. It is used to provide context for current care, even if the historical condition is not directly impacting the current encounter.

• Always sequence this code as a secondary diagnosis, as it represents a historical condition, not an active one.
• Ensure the medical record clearly documents the specific past hematologic or immune disorder.
• Do not use this code if the patient has an active disease of the blood or immune system; instead, code the active condition.