Z codes are used to identify

• A. Immunizations
• B. Diagnoses
• C. Procedures
• D. Medications

Answer: (A)

Z codes identify factors that influence health status and the reasons for patient encounters, such as an encounter for immunization. They provide context for the visit and document services delivered, like vaccination status. For immunizations, the specific Z code used is Z23, which makes immunizations the best fit among the choices. Diagnoses are coded with ICD-10-CM disease codes, procedures with ICD-10-PCS or CPT, and medications with separate pharmacologic codes, so those options don’t describe Z codes.