Immuniz not crd out due to patient having had the disease

This code indicates that a patient did not receive a recommended immunization because they have a documented history of having contracted the disease that the vaccine targets. This prior natural infection is considered to provide immunity, rendering the vaccination unnecessary.

Apply this code when a patient presents for an immunization, but the clinician determines that vaccination is contraindicated due to a confirmed past infection with the specific disease. Examples include a patient presenting for a measles vaccine but having a documented history of measles, or a patient seeking a varicella vaccine with a confirmed prior chickenpox infection.

• Always link this code to a Z23 (Encounter for immunization) code to show the intent for vaccination.
• Ensure the medical record clearly documents the specific disease the patient previously had and why it precluded the immunization.
• Do not use this code for general contraindications or patient refusal; it is specific to prior disease.