Adverse effect of mixed bact vaccines w/o a pertuss, init

This code signifies an undesirable or harmful reaction experienced by a patient following the administration of a bacterial vaccine that specifically excludes a pertussis component, such as certain meningococcal or pneumococcal vaccines. These reactions are not due to an accidental overdose or poisoning, but rather an expected, though adverse, physiological response to the vaccine.

Use this code when documenting the initial presentation of an adverse event, such as fever, localized swelling, or systemic reactions, that is directly attributable to a mixed bacterial vaccine without a pertussis component. This applies when the patient is first seen for the management of this specific adverse effect.

• Ensure the vaccine administered was a mixed bacterial type and explicitly did not contain a pertussis component.
• Confirm this is the patient's initial encounter for the management of this adverse effect. Subsequent encounters would require a different seventh character.
• Always code the specific manifestation of the adverse effect (e.g., rash, fever) in addition to this external cause code.