Is it appropriate to us ICD-10-CM Z79.899 and can you provide any examples?

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.

Let's take that patient who has repeated chronic gout issues. You are treating them to keep their Uric Acid below 6.0mg/dl. At the office E/M visit, they do not have a current gout attack, and their Uric Acid level is being treated yet is not to a level of hyperuricemia, you are medically managing them to keep their Uric Acid in a steady state at or below 6.0mg/dl and are stable on the medication you prescribe Allopurinol 100mg. This is a good example of using Z79.899 based on (b) above.