Which of the following Z codes can only be used for a principal diagnosis? Multiple Choice Z13.820 zoo.o Z18.01 Z16.342

The correct answer is Z13.820.<br /><br />Z codes are used in the ICD-10 coding system to classify various factors that influence health status and contact with health services, such as social determinants of health, environmental factors, and personal circumstances. Z codes can be used for both principal and secondary diagnoses.<br /><br />However, Z13.820 specifically refers to 'Problems in relationship' and is considered a principal diagnosis when it is the main reason for the patient's encounter or the primary focus of care during the visit. The other Z codes listed (Z00.00, Z18.01, Z16.342) can be used for both principal and secondary diagnoses.