Personal history of Clostridioides difficile infection

any follow-up examination after treatment (Z09)

• Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
• (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
• (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

any follow-up examination (Z08-Z09)

Conditions classifiable to A00-B89, B99

• personal history of infectious diseases specific to a body system
• sequelae of infectious and parasitic diseases (B90-B94)