Type O blood, Rh negative

This code identifies a patient's specific blood type as O negative. This means the individual lacks both A and B antigens on their red blood cells and also lacks the Rh factor (D antigen). This blood type is considered the "universal donor" for red blood cells.

This code is used when documenting a patient's blood type, particularly in contexts where blood transfusions or potential transfusions are relevant. It is crucial for pre-transfusion planning, managing pregnant patients, or in emergency situations requiring blood product administration.

• Assign this code as a secondary diagnosis when the blood type is clinically significant to the patient's care.
• Do not use this code as a primary diagnosis unless the sole purpose of the encounter is blood typing.
• Ensure documentation clearly states "Type O, Rh negative" or "O negative" to support code assignment.