Aplastic anemia due to other external agents

This code signifies a severe form of bone marrow failure where the body stops producing enough new blood cells (red, white, and platelets) as a direct result of exposure to an external agent other than radiation, antineoplastic chemotherapy, or other drugs. This leads to pancytopenia and its associated symptoms, such as fatigue, infection susceptibility, and bleeding.

Assign this code when documentation clearly links aplastic anemia to an identifiable external cause, such as exposure to industrial chemicals, toxins, or specific environmental factors, excluding those explicitly covered by other D61 subcategories. The medical record must specify the external agent responsible for inducing the aplastic anemia.

• Always sequence this code first when it represents the primary reason for the encounter.
• Do not use this code if the aplastic anemia is congenital, idiopathic, or due to antineoplastic chemotherapy or other drugs; specific codes exist for those etiologies.
• Ensure the documentation differentiates "other external agents" from radiation exposure (D61.0) or drug-induced aplastic anemia (D61.1).