ICD-10 chapter
Chapter XXI Factors influencing health status and contact with health services
Chapter XXI of ICD-10 is titled “Factors influencing health status and contact with health services”. It spans codes Z00–Z99, in 7 blocks.
Coding notes
- 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: 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 or to discuss a problem which is in itself not a disease or injury. When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury. Such factors may be elicited during population surveys, when the person may or may not be currently sick, or be recorded as an additional factor to be borne in mind when the person is receiving care for some illness or injury.
- This chapter should not be used for international comparison or for primary mortality coding.
Blocks in Chapter XXI
- Z00–Z13Persons encountering health services for examination and investigation11 categories
- Z20–Z29Persons with potential health hazards related to communicable diseases10 categories
- Z30–Z39Persons encountering health services in circumstances related to reproduction10 categories
- Z40–Z54Persons encountering health services for specific procedures and health care15 categories
- Z55–Z65Persons with potential health hazards related to socioeconomic and psychosocial circumstances11 categories
- Z70–Z76Persons encountering health services in other circumstances7 categories
- Z80–Z99Persons with potential health hazards related to family and personal history and certain conditions influencing health status20 categories
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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